v3.26.3
Shareholder Report, Line Graph (Details) - USD ($)
4 Months Ended 11 Months Ended 12 Months Ended 16 Months Ended 23 Months Ended 24 Months Ended 35 Months Ended 36 Months Ended 47 Months Ended 48 Months Ended 59 Months Ended 60 Months Ended 71 Months Ended 72 Months Ended 84 Months Ended 96 Months Ended 108 Months Ended 120 Months Ended
Apr. 25, 2025
Sep. 23, 2020
Aug. 31, 2016
Aug. 31, 2025
Aug. 31, 2021
Aug. 31, 2026
Aug. 31, 2017
Aug. 31, 2026
Aug. 31, 2022
Aug. 31, 2018
Aug. 31, 2023
Aug. 31, 2019
Aug. 31, 2024
Aug. 31, 2020
Aug. 31, 2025
Aug. 31, 2021
Aug. 31, 2026
Aug. 31, 2022
Aug. 31, 2023
Aug. 31, 2024
Aug. 31, 2025
Aug. 31, 2026
C000106452 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Aggressive Portfolio (Class R6/JULAX)                                
Accumulated Value     $ 1,000,000       $ 1,173,758.45     $ 1,316,761.15104   $ 1,288,559.945792   $ 1,498,397.796687   $ 1,967,168.04113   $ 1,628,201.165238 $ 1,792,561.576346 $ 2,162,533.970806 $ 2,405,839.846098 $ 2,904,286.653326
C000009055 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Aggressive Portfolio (Class R5/JTLAX)                                
Accumulated Value     10,000       11,728.0259     13,150.268589   12,861.518936   14,950.454945   19,607.858195   16,230.668543 17,856.019864 21,528.732453 23,952.177301 28,895.387652
C000009054 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Aggressive Portfolio (Class R4/JSLAX)                                
Accumulated Value     10,000       11,701.7742     13,099.497768   12,787.77963   14,829.896732   19,413.663581   16,024.97094 17,610.930584 21,196.745169 23,519.586673 28,332.198131
C000113497 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Aggressive Portfolio (Class R2/JQLAX)                                
Accumulated Value     10,000       11,670.1988     13,030.330011   12,689.106714   14,668.473238   19,164.498022   15,785.095025 17,290.692384 20,770.388204 22,989.81302 27,607.468008
C000155628 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Aggressive Portfolio (Class I/JTAIX)                                
Accumulated Value     250,000       293,091.795     328,488.690385   321,071.803373   372,741.121328   488,809.448752   404,340.565765 444,663.82494 536,002.990489 595,745.283486 718,519.051084
C000009052 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Aggressive Portfolio (Class C/JCLAX)                                
Accumulated Value     10,000       11,602.4837     12,873.571757   12,460.454334   14,320.900597   18,602.203287   15,220.256134 16,574.638236 19,785.759421 21,761.022436 25,984.474787
C000009050 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Aggressive Portfolio (Class A/JALAX)                                
Accumulated Value     9,550       11,160.359582     12,470.966365   12,159.338366   14,079.614523   18,407.656207   15,177.529476 16,640.695225 20,003.725981 22,161.511299 26,634.147288
C000009056 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Aggressive Portfolio (Class 1/JILAX)                                
Accumulated Value     10,000       11,726.0577     13,144.316757   12,864.91656   14,947.55049   19,608.530661   16,224.189645 17,857.836073 21,547.451977 23,953.453178 28,904.219232
C000009068 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Balanced Portfolio (Class 1/JILBX)                                
Accumulated Value     10,000       11,139.6457     11,926.557736   12,184.011329   13,699.922625   16,554.064906   14,176.628375 15,128.016235 17,517.417113 19,049.281781 21,699.90781
C000034075 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Balanced Portfolio (Class 5/JHLAX)                                
Accumulated Value     10,000       11,144.3462     11,937.060485   12,201.32874   13,725.267989   16,591.369804   14,217.394983 15,178.562397 17,595.458093 19,128.389534 21,811.956636
C000009062 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Balanced Portfolio (Class A/JALBX)                                
Accumulated Value     9,550       10,600.950856     11,304.37801   11,504.959615   12,896.237009   15,525.924818   13,245.631774 14,084.029137 16,252.145004 17,607.860748 19,987.344615
C000009064 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Balanced Portfolio (Class C/JCLBX)                                
Accumulated Value     10,000       11,017.0225     11,675.865344   11,800.030816   13,126.253979   15,682.889382   13,296.005058 14,035.839055 16,088.578411 17,300.72843 19,501.794228
C000155629 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Balanced Portfolio (Class I/JTBIX)                                
Accumulated Value     250,000       278,306.5375     297,763.840901   304,003.089139   341,592.089181   412,464.755032   353,048.695613 376,487.107777 435,951.687794 473,400.212425 539,314.767964
C000113498 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Balanced Portfolio (Class R2/JQLBX)                                
Accumulated Value     10,000       11,087.9577     11,816.50948   12,015.49111   13,447.73741   16,189.734564   13,802.053892 14,658.720601 16,910.740287 18,293.806489 20,765.270841
C000009066 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Balanced Portfolio (Class R4/JSLBX)                                
Accumulated Value     10,000       11,118.3022     11,874.910336   12,112.442267   13,583.074203   16,375.093443   14,004.87301 14,906.025527 17,236.824543 18,695.563387 21,255.454712
C000009067 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Balanced Portfolio (Class R5/JTSBX)                                
Accumulated Value     10,000       11,138.148     11,918.599256   12,172.701647   13,684.629219   16,533.330567   14,164.395118 15,105.513224 17,506.701618 19,034.604604 21,681.856135
C000106453 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Balanced Portfolio (Class R6/JULBX)                                
Accumulated Value     1,000,000       1,114,479.52     1,192,887.032621   1,219,073.503481   1,371,283.181044   1,657,557.413944   1,420,077.339935 1,515,999.545429 1,757,504.079294 1,910,634.407946 2,178,768.866638
C000106454 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Conservative Portfolio (Class R6/JULCX)                                
Accumulated Value     1,000,000       1,051,652.57     1,064,447.869071   1,130,716.721054   1,214,758.666049   1,320,080.015943   1,174,655.209496 1,215,545.168776 1,349,893.894172 1,437,444.124454 1,529,801.706255
C000009076 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Conservative Portfolio (Class R5/JTLRX)                                
Accumulated Value     10,000       10,508.9419     10,631.148073   11,287.995045   12,120.350352   13,163.888277   11,708.85751 12,109.979199 13,441.023101 14,305.393388 15,204.268347
C000009075 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Conservative Portfolio (Class R4/JSLCX)                                
Accumulated Value     10,000       10,488.3219     10,580.948046   11,220.528264   12,015.058359   13,034.425642   11,569.029948 11,941.297731 13,228.537863 14,051.529122 14,905.395301
C000113499 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Conservative Portfolio (Class R2/JQLCX)                                
Accumulated Value     10,000       10,461.2672     10,535.577138   11,145.74867   11,905.633826   12,884.289904   11,402.67503 11,753.899086 12,991.921997 13,757.268587 14,570.016649
C000155630 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Conservative Portfolio (Class I/JTOIX)                                
Accumulated Value     250,000       262,815.5625     265,536.502531   282,016.507764   302,444.587836   328,576.199452   292,092.997435 301,943.176564 334,935.16382 356,264.588656 378,737.655592
C000009073 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Conservative Portfolio (Class C/JCLCX)                                
Accumulated Value     10,000       10,398.0878     10,408.142335   10,934.949523   11,616.464675   12,484.771596   10,984.787214 11,247.493234 12,351.791915 13,007.580909 13,690.21082
C000009071 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Conservative Portfolio (Class A/JALRX)                                
Accumulated Value     9,550       10,000.861612     10,082.158516   10,666.44017   11,412.227427   12,360.008122   10,946.907428 11,290.086955 12,484.376062 13,238.528756 14,030.256188
C000009077 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Conservative Portfolio (Class 1/JILCX)                                
Accumulated Value     10,000       10,511.0406     10,634.951789   11,293.105458   12,128.091476   13,174.712903   11,717.905322 12,130.774936 13,464.550486 14,319.492352 15,232.63478
C000009086 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Growth Portfolio (Class 1/JILGX)                                
Accumulated Value     10,000       11,447.1258     12,540.018501   12,530.841214   14,345.029965   18,117.861355   15,242.858239 16,577.620613 19,644.017745 21,677.627162 25,519.218321
C000034076 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Growth Portfolio (Class 5/JHLGX)                                
Accumulated Value     10,000       11,447.4173     12,547.468542   12,545.481525   14,361.419903   18,163.765378   15,286.120534 16,622.960257 19,714.200522 21,755.853399 25,649.711254
C000009080 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Growth Portfolio (Class A/JALGX)                                
Accumulated Value     9,550       10,894.968329     11,890.751765   11,837.939229   13,497.293121   16,992.88904   14,243.721845 15,431.868455 18,222.323723 20,028.787225 23,519.958459
C000009082 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Growth Portfolio (Class C/JCLGX)                                
Accumulated Value     10,000       11,321.2245     12,267.88333   12,127.282714   13,735.33833   17,172.016265   14,288.597073 15,380.862442 18,027.285482 19,686.066696 22,945.003694
C000155631 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Growth Portfolio (Class I/JTGIX)                                
Accumulated Value     250,000       286,043.1925     313,193.86885   312,737.066196   357,854.069669   451,882.441591   379,869.393775 412,561.762925 488,812.995683 538,857.728839 634,616.045063
C000113500 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Growth Portfolio (Class R2/JQLGX)                                
Accumulated Value     10,000       11,393.0038     12,430.309909   12,363.029116   14,080.259547   17,719.191252   14,830.495468 16,054.032552 18,940.836096 20,812.557018 24,409.734438
C000009084 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Growth Portfolio (Class R4/JSLGX)                                
Accumulated Value     10,000       11,418.7748     12,481.466731   12,448.229833   14,217.244663   17,924.665317   15,045.318779 16,329.111908 19,313.929052 21,262.76398 24,995.145794
C000009085 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Growth Portfolio (Class R5/JTLGX)                                
Accumulated Value     10,000       11,438.5801     12,531.120751   12,519.173706   14,328.540086   18,101.210589   15,226.433523 16,559.217105 19,621.456657 21,646.879558 25,505.130835
C000106455 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Growth Portfolio (Class R6/JULGX)                                
Accumulated Value     1,000,000       1,145,275.11     1,255,052.500859   1,254,643.50435   1,436,682.77918   1,816,134.147824   1,527,676.416961 1,662,155.617922 1,970,508.223335 2,175,444.566361 2,563,615.47088
C000106456 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Moderate Portfolio (Class R6/JULMX)                                
Accumulated Value     1,000,000       1,081,272.96     1,123,945.462243   1,173,977.98441   1,289,083.978249   1,478,375.209494   1,295,485.057517 1,361,184.804918 1,541,546.392374 1,655,772.081942 1,824,734.234676
C000009104 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Moderate Portfolio (Class R5/JTLMX)                                
Accumulated Value     10,000       10,804.1691     11,224.103168   11,717.221233   12,854.191367   14,741.332426   12,915.00664 13,561.286875 15,358.15603 16,484.775988 18,152.620726
C000009103 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Moderate Portfolio (Class R4/JSLMX)                                
Accumulated Value     10,000       10,791.813     11,181.432091   11,650.62768   12,756.821108   14,590.954622   12,765.012649 13,378.675442 15,112.825106 16,190.551343 17,793.67368
C000113501 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Moderate Portfolio (Class R2/JQLMX)                                
Accumulated Value     10,000       10,764.6448     11,125.474294   11,562.411165   12,632.621352   14,418.952586   12,578.30725 13,156.259462 14,817.211433 15,843.51773 17,375.146078
C000155632 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Moderate Portfolio (Class I/JTMIX)                                
Accumulated Value     250,000       270,009.36     280,373.342572   292,345.72729   320,709.562888   367,623.923083   321,882.500265 337,831.243828 382,129.865665 410,285.736792 451,249.854582
C000009101 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Moderate Portfolio (Class C/JCLMX)                                
Accumulated Value     10,000       10,689.4858     10,986.844419   11,348.399275   12,321.197565   13,974.368004   12,120.052378 12,592.279555 14,103.067131 14,979.106224 16,326.51173
C000009099 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Moderate Portfolio (Class A/JALMX)                                
Accumulated Value     9,550       10,288.247566     10,642.473782   11,069.990468   12,109.926516   13,829.055438   12,081.349645 12,646.255553 14,259.304545 15,255.338784 16,739.588359
C000034077 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Moderate Portfolio (Class 5/JHLMX)                                
Accumulated Value     10,000       10,812.2172     11,231.576072   11,733.187132   12,887.948284   14,781.239052   12,953.850875 13,612.205215 15,417.008982 16,573.290977 18,250.62586
C000009105 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager Lifestyle Moderate Portfolio (Class 1/JILMX)                                
Accumulated Value     10,000       10,806.1765     11,227.467178   11,722.20653   12,862.383242   14,741.737828   12,925.310278 13,573.570943 15,360.897773 16,501.914015 18,172.618946
C000037309 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2010 Lifetime Portfolio (Class 1/JLAOX)                                
Accumulated Value     10,000       10,823.7668     11,245.900632   11,799.297795   12,849.394237   14,519.677999   13,028.057975 13,632.909929 15,233.011111 16,312.177484 17,699.108304
C000037307 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2010 Lifetime Portfolio (Class A/JLAAX)                                
Accumulated Value     9,500       10,232.89764     10,605.911113   11,083.201295   12,025.687363   13,543.049751   12,104.57567 12,633.866035 14,049.995068 14,990.730191 16,209.448823
C000153956 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2010 Lifetime Portfolio (Class I/JHRLX)                                
Accumulated Value     250,000       270,415.0825     280,793.502496   294,776.920643   320,411.576515   361,826.40047   324,780.876823 339,233.898658 379,336.847853 405,454.242935 439,681.08047
C000113503 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2010 Lifetime Portfolio (Class R2/JLAEX)                                
Accumulated Value     10,000       10,775.0736     11,146.293742   11,648.971081   12,617.043097   14,206.419208   12,701.874317 13,226.296221 14,717.758192 15,690.663529 16,934.130569
C000106459 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2010 Lifetime Portfolio (Class R6/JLAIX)                                
Accumulated Value     1,000,000       1,082,938.9     1,125,727.321224   1,183,070.114833   1,287,512.242582   1,457,063.056042   1,308,173.198796 1,369,576.637935 1,530,755.100221 1,639,784.708912 1,779,995.631899
C000106460 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2015 Lifetime Portfolio (Class R6/JLBJX)                                
Accumulated Value     1,000,000       1,092,883.58     1,147,106.048013   1,195,652.734542   1,318,070.237594   1,513,960.689584   1,340,056.430797 1,405,644.380556 1,584,601.310086 1,704,693.758956 1,869,837.961347
C000037339 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2015 Lifetime Portfolio (Class R5/JLBHX)                                
Accumulated Value     10,000       10,934.2603     11,460.536636   11,950.278373   13,152.056684   15,098.482292   13,338.721417 14,003.100322 15,760.921268 16,928.522468 18,564.540248
C000037338 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2015 Lifetime Portfolio (Class R4/JLBGX)                                
Accumulated Value     10,000       10,904.0689     11,407.936437   11,870.817907   13,040.393446   15,031.834571   13,279.973161 13,916.682404 15,667.66171 16,834.639134 18,418.668578
C000113504 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2015 Lifetime Portfolio (Class R2/JLBKX)                                
Accumulated Value     10,000       10,887.7608     11,340.536063   11,779.979341   12,901.126977   14,765.31312   12,988.702215 13,568.933131 15,218.306019 16,280.27822 17,763.434684
C000153957 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2015 Lifetime Portfolio (Class I/JHREX)                                
Accumulated Value     250,000       273,178.275     286,433.576044   298,500.352348   328,269.756668   376,632.321793   332,592.708172 348,951.666331 392,474.174382 421,805.162717 461,687.093935
C000037330 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2015 Lifetime Portfolio (Class A/JLBAX)                                
Accumulated Value     9,500       10,337.244595     10,806.94325   11,223.352173   12,305.728104   14,081.571049   12,410.638169 12,975.810068 14,552.657238 15,593.00764 17,037.026024
C000037340 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2015 Lifetime Portfolio (Class 1/JLBOX)                                
Accumulated Value     10,000       10,934.217     11,460.502186   11,951.489009   13,168.98815   15,104.039005   13,361.965427 14,027.972016 15,788.693625 16,980.223388 18,597.94642
C000037351 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2020 Lifetime Portfolio (Class 1/JLDOX)                                
Accumulated Value     10,000       11,084.253     11,781.922375   12,172.611392   13,602.328908   15,871.956788   13,834.590037 14,553.538126 16,513.817775 17,794.443206 19,736.638173
C000037341 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2020 Lifetime Portfolio (Class A/JLDAX)                                
Accumulated Value     9,500       10,489.6967     11,110.832971   11,431.530832   12,725.69238   14,798.943221   12,864.576904 13,476.486293 15,217.633498 16,355.078101 18,073.109383
C000153958 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2020 Lifetime Portfolio (Class I/JHRVX)                                
Accumulated Value     250,000       276,908.9325     294,154.358378   303,666.9897   339,349.582782   395,590.121483   345,015.522635 362,178.326709 411,011.906169 442,946.21604 490,781.240307
C000113505 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2020 Lifetime Portfolio (Class R2/JLDEX)                                
Accumulated Value     10,000       11,036.8906     11,670.778187   11,994.424505   13,349.535514   15,511.745631   13,475.764023 14,088.174027 15,908.661822 17,090.712463 18,862.12345
C000037349 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2020 Lifetime Portfolio (Class R4/JLDGX)                                
Accumulated Value     10,000       11,054.614     11,729.561307   12,089.355395   13,474.165184   15,704.799621   13,663.968606 14,343.709916 16,234.074331 17,463.203015 19,319.858977
C000037350 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2020 Lifetime Portfolio (Class R5/JLDHX)                                
Accumulated Value     10,000       11,084.2839     11,781.965528   12,170.062883   13,598.22244   15,865.809661   13,842.685067 14,543.429886 16,500.090726 17,797.187938 19,715.563733
C000106461 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2020 Lifetime Portfolio (Class R6/JLDIX)                                
Accumulated Value     1,000,000       1,109,173.96     1,179,709.936932   1,218,438.374915   1,362,485.717438   1,590,979.599825   1,388,503.994708 1,459,759.048318 1,657,517.23403 1,787,066.576544 1,981,303.343127
C000106462 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2025 Lifetime Portfolio (Class R6/JLEIX)                                
Accumulated Value     1,000,000       1,127,464.25     1,215,031.241398   1,243,082.704119   1,413,071.852327   1,696,562.101249   1,452,912.065571 1,537,780.001019 1,763,787.543147 1,912,544.02642 2,145,874.665399
C000037361 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2025 Lifetime Portfolio (Class R5/JLEHX)                                
Accumulated Value     10,000       11,267.7857     12,136.498061   12,396.317304   14,095.522168   16,912.157912   14,475.992176 15,312.355508 17,533.278691 19,020.661614 21,326.962104
C000037360 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2025 Lifetime Portfolio (Class R4/JLEGX)                                
Accumulated Value     10,000       11,245.0521     12,094.916029   12,325.36506   13,983.53993   16,746.22862   14,307.562426 15,116.140009 17,270.633166 18,696.138447 20,917.65961
C000113506 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2025 Lifetime Portfolio (Class R2/JLEEX)                                
Accumulated Value     10,000       11,220.4678     12,035.121898   12,240.585138   13,851.542231   16,553.35771   14,108.254125 14,865.852417 16,939.118376 18,281.735428 20,419.251839
C000153959 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2025 Lifetime Portfolio (Class I/JHRNX)                                
Accumulated Value     250,000       281,525.5825     303,298.557091   309,885.576956   352,060.969892   422,132.548403   361,208.344339 381,807.893673 437,323.315035 473,600.49103 531,098.143348
C000037352 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2025 Lifetime Portfolio (Class A/JLEAX)                                
Accumulated Value     9,500       10,660.728335     11,449.630334   11,655.49629   13,198.252163   15,788.573996   13,463.022988 14,194.399962 16,202.904718 17,506.655729 19,545.645593
C000037362 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2025 Lifetime Portfolio (Class 1/JLEOX)                                
Accumulated Value     10,000       11,267.7456     12,136.424898   12,397.573455   14,096.987821   16,915.340235   14,480.099766 15,336.33717 17,559.689678 19,030.882974 21,338.422828
C000037373 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2030 Lifetime Portfolio (Class 1/JLFOX)                                
Accumulated Value     10,000       11,429.1677     12,467.64885   12,607.682988   14,553.091843   17,887.543835   15,002.074446 16,059.519967 18,705.44408 20,494.942101 23,407.407206
C000037363 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2030 Lifetime Portfolio (Class A/JLFAX)                                
Accumulated Value     9,500       10,814.68334     11,764.975081   11,845.727635   13,631.069506   16,680.438035   13,955.200246 14,871.078364 17,253.083083 18,847.262094 21,438.840356
C000153960 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2030 Lifetime Portfolio (Class I/JHRGX)                                
Accumulated Value     250,000       285,540.43     311,278.244847   314,271.792164   362,807.305488   445,679.855422   373,890.011719 399,463.98757 465,427.148277 509,562.766979 581,483.663574
C000113507 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2030 Lifetime Portfolio (Class R2/JLFEX)                                
Accumulated Value     10,000       11,373.6629     12,358.05513   12,429.577621   14,294.224697   17,479.924094   14,613.322471 15,547.852334 18,033.266552 19,682.559897 22,360.563289
C000037371 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2030 Lifetime Portfolio (Class R4/JLFGX)                                
Accumulated Value     10,000       11,399.1584     12,411.300732   12,518.324495   14,425.123193   17,694.863848   14,815.248597 15,824.975643 18,386.569831 20,110.598502 22,912.9008
C000037372 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2030 Lifetime Portfolio (Class R5/JLFHX)                                
Accumulated Value     10,000       11,420.3249     12,469.437515   12,597.778078   14,542.24588   17,875.8619   15,002.553418 16,043.293151 18,687.848417 20,475.51342 23,365.042035
C000106463 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2030 Lifetime Portfolio (Class R6/JLFIX)                                
Accumulated Value     1,000,000       1,142,595.83     1,248,139.634879   1,261,813.978128   1,457,376.671781   1,792,341.146187   1,505,075.981102 1,610,341.747758 1,876,651.917673 2,057,165.057616 2,350,654.213458
C000106464 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2035 Lifetime Portfolio (Class R6/JLHIX)                                
Accumulated Value     1,000,000       1,154,577.84     1,275,885.454267   1,275,310.042686   1,488,040.86352   1,870,851.547835   1,550,670.365778 1,676,484.920801 1,982,829.597149 2,194,774.411415 2,551,089.123569
C000037383 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2035 Lifetime Portfolio (Class R5/JLHHX)                                
Accumulated Value     10,000       11,538.6913     12,733.875291   12,716.694492   14,841.338768   18,646.091683   15,449.085012 16,692.11283 19,729.303018 21,825.627286 25,373.186134
C000037382 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2035 Lifetime Portfolio (Class R4/JLHGX)                                
Accumulated Value     10,000       11,517.5263     12,688.358749   12,641.969856   14,718.410497   18,446.406666   15,270.80906 16,462.059373 19,440.16477 21,462.826628 24,896.298748
C000113508 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2035 Lifetime Portfolio (Class R2/JLHEX)                                
Accumulated Value     10,000       11,490.7299     12,629.966366   12,557.479832   14,583.252981   18,241.933176   15,045.687631 16,172.313686 19,051.061532 20,973.586452 24,275.839467
C000153961 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2035 Lifetime Portfolio (Class I/JHRMX)                                
Accumulated Value     250,000       288,526.4575     318,238.058055   317,668.141429   370,080.408214   464,548.239755   384,694.065069 415,037.382645 490,706.670369 541,824.84043 629,600.946804
C000037374 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2035 Lifetime Portfolio (Class A/JLHAX)                                
Accumulated Value     9,500       10,929.57558     12,027.935737   11,972.840815   13,913.569348   17,406.238816   14,379.760199 15,483.129121 18,235.722603 20,106.746767 23,277.07364
C000037384 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2035 Lifetime Portfolio (Class 1/JLHOX)                                
Accumulated Value     10,000       11,548.7019     12,755.219386   12,742.230619   14,858.937222   18,669.690871   15,470.104267 16,716.596316 19,778.794752 21,861.733449 25,415.161028
C000037395 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2040 Lifetime Portfolio (Class 1/JLIOX)                                
Accumulated Value     10,000       11,626.4624     12,932.475594   12,833.222465   15,090.945498   19,306.521292   15,881.576464 17,355.136625 20,770.681834 23,212.0711 27,363.899126
C000037385 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2040 Lifetime Portfolio (Class A/JLIAX)                                
Accumulated Value     9,500       11,002.209065     12,193.224051   12,060.122939   14,131.996342   18,015.224312   14,750.439607 16,059.179146 19,170.301279 21,333.062847 25,064.992702
C000153962 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2040 Lifetime Portfolio (Class I/JHRDX)                                
Accumulated Value     250,000       290,454.8925     322,881.94184   320,148.142413   376,196.749831   481,364.157606   395,399.031915 431,713.775915 516,808.424986 576,620.188594 679,812.224038
C000113509 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2040 Lifetime Portfolio (Class R2/JLIEX)                                
Accumulated Value     10,000       11,569.0408     12,807.894643   12,657.015723   14,814.394813   18,876.510759   15,438.323269 16,803.069965 20,027.016188 22,258.54389 26,156.947113
C000037393 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2040 Lifetime Portfolio (Class R4/JLIGX)                                
Accumulated Value     10,000       11,600.39     12,873.202539   12,751.96851   14,963.815428   19,110.746426   15,678.910057 17,101.71862 20,438.048099 22,775.738347 26,815.776253
C000037394 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2040 Lifetime Portfolio (Class R5/JLIHX)                                
Accumulated Value     10,000       11,624.9801     12,928.96737   12,828.184776   15,093.094701   19,314.035602   15,880.289976 17,348.274939 20,772.253827 23,185.660897 27,344.793086
C000106465 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2040 Lifetime Portfolio (Class R6/JLIIX)                                
Accumulated Value     1,000,000       1,162,363.67     1,293,634.850739   1,284,435.567525   1,511,303.906183   1,934,706.531549   1,591,935.504014 1,738,703.345113 2,084,311.859611 2,328,508.523967 2,746,993.058903
C000106466 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2045 Lifetime Portfolio (Class R6/JLJIX)                                
Accumulated Value     1,000,000       1,163,365.18     1,296,973.959788   1,285,371.8922   1,513,133.326077   1,959,462.732341   1,604,351.417579 1,770,947.284824 2,142,508.247057 2,412,883.939277 2,881,194.743872
C000037405 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2045 Lifetime Portfolio (Class R5/JLJHX)                                
Accumulated Value     10,000       11,635.2374     12,963.410454   12,835.417647   15,108.981616   19,544.374108   16,002.131614 17,667.298068 21,348.814056 24,041.727842 28,696.380655
C000037404 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2045 Lifetime Portfolio (Class R4/JLJGX)                                
Accumulated Value     10,000       11,600.3544     12,903.185099   12,757.775364   14,975.548888   19,344.592495   15,794.802706 17,411.204276 20,997.496403 23,587.664199 28,110.884692
C000113510 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2045 Lifetime Portfolio (Class R2/JLJEX)                                
Accumulated Value     10,000       11,579.8935     12,842.343101   12,667.315064   14,830.503464   19,102.520898   15,573.028915 17,096.015547 20,588.41935 23,069.090821 27,422.424346
C000153963 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2045 Lifetime Portfolio (Class I/JHROX)                                
Accumulated Value     250,000       290,490.8675     323,521.26812   319,892.517698   376,516.305186   486,768.509991   398,039.90303 439,327.161169 530,992.386739 596,867.15887 712,055.191003
C000037396 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2045 Lifetime Portfolio (Class A/JLJAX)                                
Accumulated Value     9,500       11,004.311225     12,228.384478   12,070.429947   14,140.154778   18,230.999264   14,873.760567 16,355.193515 19,713.326895 22,103.018371 26,282.6251
C000037406 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2045 Lifetime Portfolio (Class 1/JLJOX)                                
Accumulated Value     10,000       11,627.2104     12,966.094258   12,842.794481   15,109.439571   19,554.5755   16,007.448247 17,660.061686 21,373.310759 24,036.524879 28,707.421134
C000037417 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2050 Lifetime Portfolio (Class 1/JLKOX)                                
Accumulated Value     10,000       11,617.8783     12,947.176649   12,822.178003   15,090.038678   19,526.174598   15,961.202992 17,667.342906 21,460.284156 24,269.372903 29,235.413972
C000037407 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2050 Lifetime Portfolio (Class A/JLKAX)                                
Accumulated Value     9,500       11,007.60801     12,218.666364   12,055.823799   14,129.687104   18,215.895261   14,835.090496 16,369.870063 19,810.897454 22,332.221062 26,791.047754
C000153964 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2050 Lifetime Portfolio (Class I/JHRPX)                                
Accumulated Value     250,000       290,479.78     323,271.272593   320,173.493296   376,179.473411   486,485.075681   397,413.983176 439,903.360092 533,917.377079 603,348.435946 726,320.5068
C000113511 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2050 Lifetime Portfolio (Class R2/JLKEX)                                
Accumulated Value     10,000       11,578.6326     12,842.532398   12,657.151599   14,823.968618   19,089.593902   15,530.753936 17,119.913483 20,704.582147 23,304.871033 27,940.81674
C000037415 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2050 Lifetime Portfolio (Class R4/JLKGX)                                
Accumulated Value     10,000       11,598.0086     12,893.492591   12,747.245573   14,960.892723   19,322.80473   15,769.112931 17,416.296595 21,104.939682 23,826.088407 28,622.329323
C000037416 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2050 Lifetime Portfolio (Class R5/JLKHX)                                
Accumulated Value     10,000       11,628.9277     12,959.832194   12,823.567853   15,089.662333   19,520.542644   15,970.455944 17,675.003468 21,460.461082 24,280.194414 29,238.660511
C000106467 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2050 Lifetime Portfolio (Class R6/JLKRX)                                
Accumulated Value     1,000,000       1,163,125.26     1,296,670.603327   1,284,995.718349   1,512,666.273943   1,957,394.590594   1,601,140.945528 1,772,976.84884 2,155,367.407154 2,439,488.606929 2,938,621.246725
C000138477 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2055 Lifetime Portfolio (Class R6/JLKTX)                                
Accumulated Value     1,000,000       1,162,791.92     1,296,233.537018   1,285,905.848161   1,513,226.020805   1,959,148.004294   1,603,075.264266 1,774,043.064862 2,156,373.525547 2,441,001.957369 2,939,167.983434
C000138476 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2055 Lifetime Portfolio (Class R5/JLKSX)                                
Accumulated Value     10,000       11,624.428     12,943.960181   12,818.988058   15,090.788991   19,528.626647   15,971.74098 17,663.188119 21,459.511 24,279.912213 29,220.489269
C000138475 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2055 Lifetime Portfolio (Class R4/JLKQX)                                
Accumulated Value     10,000       11,609.9094     12,924.267359   12,789.694071   15,031.984131   19,420.374678   15,872.583727 17,549.121574 21,291.826417 24,055.919399 28,944.042769
C000138473 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2055 Lifetime Portfolio (Class R2/JLKNX)                                
Accumulated Value     10,000       11,593.5131     12,866.87525   12,693.361063   14,860.719208   19,139.775774   15,577.180787 17,163.455888 20,753.768178 23,362.387127 27,996.413334
C000153974 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2055 Lifetime Portfolio (Class I/JHRTX)                                
Accumulated Value     250,000       290,119.66     323,392.659866   320,127.221887   376,369.384307   486,546.2411   397,577.879418 439,853.388918 534,193.306519 603,232.21975 726,319.552392
C000138479 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2055 Lifetime Portfolio (Class A/JLKLX)                                
Accumulated Value     9,500       10,994.66939     12,213.536899   12,054.447398   14,135.070213   18,215.927885   14,839.197797 16,364.431091 19,816.670328 22,322.988266 26,784.737283
C000138478 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2055 Lifetime Portfolio (Class 1/JLKUX)                                
Accumulated Value     10,000       11,622.1645     12,949.950073   12,827.792028   15,089.673495   19,532.582347   15,973.797995 17,686.165179 21,472.483975 24,281.78617 29,252.372453
C000167626 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2060 Lifetime Portfolio (Class 1/JRETX)                                
Accumulated Value     10,000       11,609.9786     12,936.566914   12,817.341702   15,081.104705   19,532.470112   15,966.494235 17,684.051373 21,500.704333 24,314.481083 29,280.475076
C000167627 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2060 Lifetime Portfolio (Class A/JJERX)                                
Accumulated Value     9,500       10,981.34801500     12,197.83396500   12,039.67050700   14,110.45651100   18,212.07131000   14,830.10933700 16,364.20955200 19,814.28959800 22,339.84946400 26,802.64410700
C000167619 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2060 Lifetime Portfolio (Class I/JMENX)                                
Accumulated Value     250,000       290,102.4475     323,321.164941   319,879.792659   376,170.818305   486,676.529655   397,803.131813 440,314.801078 534,991.89724 604,590.084535 728,043.262539
C000167621 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2060 Lifetime Portfolio (Class R2/JVIMX)                                
Accumulated Value     10,000       11,592.3435     12,882.327429   12,718.271762   14,911.224604   19,238.359246   15,649.94064 17,264.518098 20,872.77493 23,514.510763 28,191.138977
C000167623 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2060 Lifetime Portfolio (Class R4/JROUX)                                
Accumulated Value     10,000       11,590.0281     12,903.569447   12,774.06974   15,005.680562   19,412.567436   15,848.341822 17,527.844489 21,271.173164 24,014.530619 28,858.238151
C000167624 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2060 Lifetime Portfolio (Class R5/JGHTX)                                
Accumulated Value     10,000       11,622.0489     12,943.399619   12,818.785874   15,083.385274   19,537.352078   15,979.613941 17,683.905444 21,486.444862 24,315.579238 29,268.271491
C000167625 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2060 Lifetime Portfolio (Class R6/JESRX)                                
Accumulated Value     1,000,000       1,162,366.47     1,295,708.687951   1,284,569.03982   1,512,011.622588   1,958,718.642912   1,601,970.321789 1,775,100.204553 2,158,660.590568 2,441,880.508187 2,941,594.627306
C000221539 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2065 Lifetime Portfolio (Class R6/JABEX)                                
Accumulated Value   $ 1,000,000     $ 1,375,279.5       $ 1,125,011.802742   $ 1,247,592.22251   $ 1,515,905.768603   $ 1,716,571.869521   $ 2,068,244.918487          
C000221538 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2065 Lifetime Portfolio (Class R5/JABDX)                                
Accumulated Value   10,000     13,752.795       11,251.40914   12,468.293932   15,156.251878   17,142.580688   20,647.031944          
C000221537 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2065 Lifetime Portfolio (Class R4/JABBX)                                
Accumulated Value   10,000     13,727.84       11,220.850053   12,416.808535   15,071.932203   17,037.092866   20,486.135613          
C000221536 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2065 Lifetime Portfolio (Class R2/JAAZX)                                
Accumulated Value   10,000     13,713.9408       11,195.375983   12,376.20513   15,008.246858   16,908.830307   20,294.586683          
C000221535 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2065 Lifetime Portfolio (Class I/JABSX)                                
Accumulated Value   250,000     343,482.375       280,658.311686   310,940.698003   377,484.597512   426,751.656245   513,469.338208          
C000221534 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2065 Lifetime Portfolio (Class A/JAAWX)                                
Accumulated Value   9,500     13,013.364955       10,604.991653   11,703.152537   14,174.589414   15,970.720811   19,171.142265          
C000221540 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2065 Lifetime Portfolio (Class 1/JAAVX)                                
Accumulated Value   10,000     13,741.3365       11,244.953257   12,454.614035   15,129.688523   17,115.670444   20,617.147235          
C000259699 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2070 Lifetime Portfolio (Class 1/JHOPX)                                
Accumulated Value $ 10,000     $ 11,470       $ 13,842.402153                            
C000259695 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2070 Lifetime Portfolio (Class A/JHOQX)                                
Accumulated Value 9,500     10,877.5       13,079.622137                            
C000259698 [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Multimanager 2070 Lifetime Portfolio (Class R6/JHBZX)                                
Accumulated Value 1,000,000     1,147,000       1,384,697.90268                            
Standard & Poor's 500 Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           S&P 500 Index                                
Accumulated Value 10,000 10,000 10,000 11,832.5074 13,834.0945   11,623.4067 14,243.949098 12,280.856323 13,908.750015 14,238.979302 14,315.103326 18,102.778593 17,455.368033 20,977.428147 22,895.454097 25,252.586678 20,324.841803 23,565.539253 29,960.134815 34,717.685581 41,793.081509
Bloomberg U S Aggregate Bond Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Bloomberg U.S. Aggregate Bond Index                                
Accumulated Value     10,000       10,049.2106     9,943.773378   10,955.313072   11,664.488502   11,654.653122   10,312.510844 10,189.458871 10,932.953218 11,275.83042 11,489.025816
Bloomberg U S Aggregate Bond C000153958 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       251,230.265     248,594.334449   273,882.826799   291,612.212551   291,366.328049   257,812.771099 254,736.47177 273,323.830453 281,895.760492 287,225.645385
Bloomberg U S Aggregate Bond C000106461 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,004,921.06     994,377.337796   1,095,531.307198   1,166,448.850207   1,165,465.312201   1,031,251.0844 1,018,945.887086 1,093,295.321818 1,127,583.041975 1,148,902.581549
Standard And Poor s 500 C000167619 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       290,585.1675     347,718.750371   357,877.583157   436,384.200832   572,386.352436   508,121.045091 589,138.481344 749,003.370395 867,942.13956 1,044,827.037756
Standard And Poor s 500 C000167625 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,162,340.67     1,390,875.001483   1,431,510.332629   1,745,536.803329   2,289,545.409746   2,032,484.180367 2,356,553.925378 2,996,013.481582 3,471,768.558244 4,179,308.15103
Standard And Poor s 500 C000221535 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value   250,000     345,852.3625       307,021.408063   355,974.482525   452,569.464785   524,435.703618   631,314.666877          
Standard And Poor s 500 C000221539 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value   1,000,000     1,383,409.45       1,228,085.632251   1,423,897.930098   1,810,277.859135   2,097,742.814465   2,525,258.6675          
Standard And poor s 500 C000259698 index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value 1,000,000     1,183,250.74       1,424,394.909808                            
John Hancock Lifestyle Aggressive C000106452 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,151,730.15     1,311,376.856189   1,319,014.682185   1,501,665.359012   1,954,925.478145   1,677,176.019718 1,857,436.801847 2,247,917.419382 2,549,983.795321 3,134,021.042371
Morningstar U S Aggressive Target Allocation C000106452 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,153,926.25     1,322,555.100994   1,335,486.555426   1,566,338.667913   2,011,908.575459   1,722,831.274182 1,960,649.283809 2,414,253.240183 2,779,430.433044 3,318,256.570215
John Hancock Lifestyle Aggressive C000155628 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       287,932.5375     327,844.214047   329,753.670546   375,416.339753   488,731.369536   419,294.004929 464,359.200461 561,979.354845 637,495.94883 783,505.260593
Morningstar U S Aggressive Target Allocation C000155628 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       288,481.5625     330,638.775249   333,871.638857   391,584.666979   502,977.143866   430,707.818547 490,162.320954 603,563.310048 694,857.608264 829,564.142557
John Hancock Lifestyle Aggressive Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           John Hancock Lifestyle Aggressive Index                                
Accumulated Value     10,000       11,517.3015     13,113.768562   13,190.146822   15,016.65359   19,549.254781   16,771.760197 18,574.368018 22,479.174193 25,499.837952 31,340.210422
Morningstar U S Aggressive Target Allocation Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Morningstar U.S. Aggressive Target Allocation Index                                
Accumulated Value     10,000       11,539.2625     13,225.55101   13,354.865554   15,663.386679   20,119.085754   17,228.312741 19,606.492837 24,142.5324 27,794.304328 33,182.565699
Morningstar U S Moderate Target Allocation Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Morningstar U.S. Moderate Target Allocation Index                                
Accumulated Value     10,000       10,988.5167     12,055.755946   12,587.327258   14,319.276902   16,900.392289   14,781.478227 16,092.86289 18,942.831018 21,057.40087 23,823.904508
John Hancock Lifestyle Balanced Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           John Hancock Lifestyle Balanced Index                                
Accumulated Value     10,000       10,974.0469     11,904.53491   12,467.653577   13,934.332759   16,576.579051   14,395.361997 15,332.840945 17,797.015392 19,514.595381 22,427.626264
Morningstar U S Moderate Target Allocation C000155629 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       274,712.9175     301,393.898646   314,683.181457   357,981.922551   422,509.807228   369,536.955681 402,321.572269 473,570.775481 526,435.021784 595,597.612741
John Hancock Lifestyle Balanced C000155629 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       274,351.1725     297,613.372751   311,691.339433   348,358.31899   414,414.476303   359,884.049961 383,321.023668 444,925.384855 487,864.884589 560,690.656668
Morningstar U S Moderate Target Allocation C000106453 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,098,851.67     1,205,575.594585   1,258,732.725827   1,431,927.690205   1,690,039.228913   1,478,147.822724 1,609,286.289075 1,894,283.101925 2,105,740.087138 2,382,390.450965
John Hancock Lifestyle Balanced C000106453 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,097,404.69     1,190,453.491002   1,246,765.357728   1,393,433.275954   1,657,657.905204   1,439,536.199838 1,533,284.094665 1,779,701.539411 1,951,459.538347 2,242,762.62666
John Hancock Lifestyle Conservative C000155630 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       261,921.87     268,868.226576   287,724.229551   310,262.971842   334,724.709555   298,984.545637 308,407.348557 342,236.411837 365,478.18623 389,538.19634
Morningstar U S Conservative Target Allocation C000155630 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       259,605.1175     268,518.602096   289,205.481961   312,853.279191   333,466.890803   296,068.652362 305,637.357312 340,252.643246 362,969.845747 386,010.815845
John Hancock Lifestyle Conservative C000106454 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,047,687.48     1,075,472.906305   1,150,896.918207   1,241,051.887373   1,338,898.838225   1,195,938.182553 1,233,629.394233 1,368,945.647353 1,461,912.744925 1,558,152.785365
Morningstar U S Conservative Target Allocation C000106454 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,038,420.47     1,074,074.408385   1,156,821.927844   1,251,413.116763   1,333,867.563212   1,184,274.609449 1,222,549.429249 1,361,010.572986 1,451,879.382989 1,544,043.263379
John Hancock Lifestyle Conservative Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           John Hancock Lifestyle Conservative Index                                
Accumulated Value     10,000       10,476.8748     10,754.729063   11,508.96918200   12,410.51887400   13,388.98838300   11,959.381826 12,336.293943 13,689.456474 14,619.12745 15,581.527854
Morningstar U S Conservative Target Allocation Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Morningstar U.S. Conservative Target Allocation Index                                
Accumulated Value     10,000       10,384.2047     10,740.744084   11,568.219279   12,514.131168   13,338.675633   11,842.746095 12,225.494293 13,610.10573 14,518.79383 15,440.432634
Morningstar U S Moderately Aggressive Target Allocation Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Morningstar U.S. Moderately Aggressive Target Allocation Index                                
Accumulated Value     10,000       11,288.9016     12,638.514396   12,954.027578   14,948.317352   18,438.714923   15,906.620978 17,736.277193 21,355.016391 24,211.104619 28,230.807012
John Hancock Lifestyle Growth Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           John Hancock Lifestyle Growth Index                                
Accumulated Value     10,000       11,293.8231     12,601.076686   12,871.071891   14,534.681487   18,228.891859   15,758.902897 17,199.111239 20,457.227284 22,913.410776 27,360.811925
Morningstar U S Moderately Aggressive Target Allocation C000155631 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       282,222.54     315,962.859902   323,850.689441   373,707.933802   460,967.873079   397,665.524444 443,406.929813 533,875.409763 605,277.615466 705,770.17529
John Hancock Lifestyle Growth C000155631 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       282,345.5775     315,026.917159   321,776.797296   363,367.037198   455,722.296515   393,972.572463 429,977.781017 511,430.682161 572,835.26947 684,020.298205
Morningstar U S Moderately Aggressive Target Allocation C000106455 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,128,890.16     1,263,851.439609   1,295,402.757765   1,494,831.735209   1,843,871.492319   1,590,662.097778 1,773,627.719256 2,135,501.639058 2,421,110.461871 2,823,080.701168
John Hancock Lifestyle Growth C000106455 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,129,382.31     1,260,107.668635   1,287,107.189182   1,453,468.14879   1,822,889.186056   1,575,890.289848 1,719,911.124062 2,045,722.728636 2,291,341.077873 2,736,081.19281
John Hancock Lifestyle Moderate C000155632 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       267,686.165     282,340.258635   299,956.328509   329,572.516604   372,978.489191   327,931.1282 343,102.41586 389,210.738376 420,320.574545 465,296.183218
Morningstar U S Moderately Conservative Target Allocation C000155632 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       266,741.835     282,307.888209   299,644.119201   331,275.361463   369,939.154886   325,420.436527 344,353.286881 393,362.362925 428,037.88853 469,061.202421
John Hancock Lifestyle Moderate C000106456 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,070,744.66     1,129,361.034539   1,199,825.314035   1,318,290.066416   1,491,913.956763   1,311,724.512799 1,372,409.663438 1,556,842.953501 1,681,282.298175 1,861,184.732868
Morningstar U S Moderately Conservative Target Allocation C000106456 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,066,967.34     1,129,231.552835   1,198,576.476801   1,325,101.445849   1,479,756.619542   1,301,681.746105 1,377,413.147522 1,573,449.451697 1,712,151.554118 1,876,244.809682
John Hancock Lifestyle Moderate Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           John Hancock Lifestyle Moderate Index                                
Accumulated Value     10,000       10,707.4466     11,293.610345   11,998.25314   13,182.900664   14,919.139567   13,117.245127 13,724.096633 15,568.429533 16,812.82298 18,611.847327
Morningstar U S Moderately Conservative Target Allocation Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           Morningstar U.S. Moderately Conservative Target Allocation Index                                
Accumulated Value     10,000       10,669.6734     11,292.315528   11,985.764768   13,251.014458   14,797.566195   13,016.817461 13,774.131475 15,734.494517 17,121.515541 18,762.448097
S And P Target Date 2010 Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           S&P Target Date 2010 Index                                
Accumulated Value     10,000       10,635.32     11,207.094159   11,702.70851   12,774.136295   14,162.538646   12,708.160077 13,379.023593 15,016.162264 16,168.10658 17,540.937923
John Hancock 2010 Lifetime Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           John Hancock 2010 Lifetime Index                                
Accumulated Value     10,000       10,686.6505     11,217.951329   11,919.282277   12,887.714784   14,448.148464   13,021.541463 13,608.607373 15,260.217776 16,368.837499 17,806.685351
S And P Target Date 2010 C000153956 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       265,883     280,177.353987   292,567.71276   319,353.407398   354,063.466186   317,704.00196 334,475.589869 375,404.056657 404,202.66456 438,523.448135
John Hancock 2010 Lifetime C000153956 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       267,166.2625     280,448.783228   297,982.056941   322,192.869621   361,203.711633   325,538.536611 340,215.184359 381,505.444437 409,220.937513 445,167.133828
S And P Target Date 2010 C000106459 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,063,532     1,120,709.415948   1,170,270.851041   1,277,413.629591   1,416,253.864741   1,270,816.007838 1,337,902.359475 1,501,616.226627 1,616,810.658238 1,754,093.792539
John Hancock 2010 Lifetime C000106459 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,068,665.05     1,121,795.132912   1,191,928.227762   1,288,771.478483   1,444,814.84653   1,302,154.146443 1,360,860.737434 1,526,021.777745 1,636,883.750048 1,780,668.535307
John Hancock 2015 Lifetime C000153957 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       269,075.06     284,941.09782   302,466.397192   329,758.17311   375,197.477571   334,846.215754 351,110.48669 396,646.70793 426,722.377129 469,930.258106
S And P Target Date 2015 C000153957 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       269,125.23     286,135.217498   297,266.289493   325,135.337071   366,423.116044   327,798.590958 345,863.40085 390,050.895108 420,763.654709 459,647.753654
John Hancock 2015 Lifetime C000106460 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,076,300.24     1,139,764.391282   1,209,865.58877   1,319,032.692441   1,500,789.910283   1,339,384.863015 1,404,441.94676 1,586,586.831719 1,706,889.508514 1,879,721.032421
S And P Target Date 2015 C000106460 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,076,500.92     1,144,540.869993   1,189,065.157975   1,300,541.348288   1,465,692.46418   1,311,194.363837 1,383,453.603407 1,560,203.58044 1,683,054.618843 1,838,591.014623
John Hancock 2015 Lifetime Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           John Hancock 2015 Lifetime Index                                
Accumulated Value     10,000       10,763.0024     11,397.643913   12,098.655888   13,190.326925   15,007.899104   13,393.848631 14,044.419468 15,865.868318 17,068.895086 18,797.210325
S And P Target Date 2015 Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           S&P Target Date 2015 Index                                
Accumulated Value     10,000       10,765.0092     11,445.4087   11,890.65158   13,005.413483   14,656.924642   13,111.943639 13,834.536035 15,602.035805 16,830.546189 18,385.910147
S And P Target Date 2020 Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           S&P Target Date 2020 Index                                
Accumulated Value     10,000       10,889.1926     11,670.546071   12,075.478308   13,222.910061   15,046.531967   13,369.236518 14,212.667291 16,165.494172 17,515.029554 19,262.496346
John Hancock 2020 Lifetime Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           John Hancock 2020 Lifetime Index                                
Accumulated Value     10,000       10,929.933     11,762.146733   12,436.185256   13,714.431345   15,846.049912   14,001.447054 14,730.212852 16,762.213308 18,083.612443 20,165.752346
S And P Target Date 2020 C000153958 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       272,229.815     291,763.651764   301,886.957683   330,572.751497   376,163.299138   334,230.912908 355,316.68223 404,137.354261 437,875.738814 481,562.40861
John Hancock 2020 Lifetime C000153958 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       273,248.325     294,053.668332   310,904.631395   342,860.783608   396,151.247772   350,036.176321 368,255.321274 419,055.332682 452,090.311049 504,143.808627
S And P Target Date 2020 C000106461 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,088,919.26     1,167,054.607055   1,207,547.830733   1,322,291.005988   1,504,653.196553   1,336,923.651632 1,421,266.72892 1,616,549.417044 1,751,502.955256 1,926,249.634441
John Hancock 2020 Lifetime C000106461 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,092,993.3     1,176,214.673327   1,243,618.525581   1,371,443.134434   1,584,604.991088   1,400,144.705283 1,473,021.285095 1,676,221.330727 1,808,361.244195 2,016,575.234507
John Hancock 2025 Lifetime C000106462 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,110,221.09     1,215,026.749153   1,275,578.117508   1,431,071.880891   1,701,314.378642   1,484,263.361278 1,571,809.86007 1,805,553.311409 1,953,785.211892 2,206,712.515573
S And P Target Date 2025 C000106462 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,101,420.15     1,195,215.459872   1,226,777.753564   1,352,887.329276   1,582,308.785563   1,398,753.387179 1,498,861.873361 1,713,240.789612 1,868,874.666774 2,085,303.71564
John Hancock 2025 Lifetime C000153959 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       277,555.2725     303,756.687288   318,894.529377   357,767.970223   425,328.594661   371,065.84032 392,952.465018 451,388.327853 488,446.302974 551,678.128894
S And P Target Date 2025 C000153959 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       275,355.0375     298,803.864968   306,694.438391   338,221.832319   395,577.196391   349,688.346795 374,715.468341 428,310.197404 467,218.666695 521,325.928912
John Hancock 2025 Lifetime Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           John Hancock 2025 Lifetime Index                                
Accumulated Value     10,000       11,102.2109     12,150.267492   12,755.781176   14,310.71881   17,013.143788   14,842.633614 15,718.098602 18,055.533116 19,537.852121 22,067.125158
S And P Target Date 2025 Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           S&P Target Date 2025 Index                                
Accumulated Value     10,000       11,014.2015     11,952.154599   12,267.777536   13,528.873293   15,823.087856   13,987.533872 14,988.618734 17,132.407897 18,688.746669 20,853.037158
S And P Target Date 2030 Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           S&P Target Date 2030 Index                                
Accumulated Value     10,000       11,125.9402     12,226.19266   12,431.857027   13,796.45324   16,552.329956   14,512.977302 15,762.483983 18,293.213521 20,112.308967 22,821.265226
John Hancock 2030 Lifetime Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           John Hancock 2030 Lifetime Index                                
Accumulated Value     10,000       11,288.4939     12,538.506082   13,034.792691   14,820.392966   18,074.978531   15,567.148644 16,670.330355 19,453.308145 21,264.086847 24,501.541518
S And P Target Date 2030 C000106463 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,112,594.02     1,222,619.265957   1,243,185.702654   1,379,645.323946   1,655,232.9955   1,451,297.730068 1,576,248.398202 1,829,321.352002 2,011,230.896566 2,282,126.522422
John Hancock 2030 Lifetime C000106463 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,128,849.39     1,253,850.608158   1,303,479.26908   1,482,039.296548   1,807,497.853022   1,556,714.864356 1,667,033.035501 1,945,330.814503 2,126,408.684669 2,450,154.151741
S And P Target Date 2030 C000153960 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       278,148.505     305,654.816489   310,796.425663   344,911.330986   413,808.248874   362,824.432516 394,062.099549 457,330.337999 502,807.72414 570,531.630604
John Hancock 2030 Lifetime C000153960 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       282,212.3475     313,462.652039   325,869.817269   370,509.824136   451,874.463254   389,178.716088 416,758.258874 486,332.703624 531,602.171165 612,538.537933
John Hancock 2035 Lifetime C000106464 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,144,907.2     1,288,861.328255   1,321,769.515223   1,516,079.04496   1,895,799.431809   1,620,181.304493 1,754,781.301148 2,076,163.512649 2,293,141.783472 2,692,101.352664
S And P Target Date 2035 C000106464 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,123,884.49     1,248,904.782531   1,258,323.822576   1,405,469.064578   1,735,113.457079   1,507,243.921751 1,659,348.813706 1,955,581.372528 2,173,682.728278 2,513,862.66236
John Hancock 2035 Lifetime C000153961 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       286,226.8     322,215.332064   330,442.378806   379,019.76124   473,949.857952   405,045.326123 438,695.325287 519,040.878162 573,285.445868 673,025.338166
S And P Target Date 2035 C000153961 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       280,971.1225     312,226.195633   314,580.955644   351,367.266145   433,778.36427   376,810.980438 414,837.203427 488,895.343133 543,420.682071 628,465.665592
John Hancock 2035 Lifetime Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           John Hancock 2035 Lifetime Index                                
Accumulated Value     10,000       11,449.072     12,888.613283   13,217.695153   15,160.79045   18,957.994319   16,201.813046 17,547.813013 20,761.635128 22,931.417836 26,921.013528
S And P Target Date 2035 Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           S&P Target Date 2035 Index                                
Accumulated Value     10,000       11,238.8449     12,489.047825   12,583.238225   14,054.690645   17,351.13457   15,072.439217 16,593.488137 19,555.813725 21,736.827282 25,138.626623
S And P Target Date 2040 Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           S&P Target Date 2040 Index                                
Accumulated Value     10,000       11,316.1313     12,672.04939   12,694.699158   14,235.22629   17,923.275051   15,478.732651 17,247.891116 20,600.319558 23,115.510424 27,226.205904
John Hancock 2040 Lifetime Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           John Hancock 2040 Lifetime Index                                
Accumulated Value     10,000       11,578.0332     13,187.317062   13,350.939622   15,428.079876   19,713.1854   16,794.737997 18,413.09373 22,054.45886 24,664.95385 29,426.398633
S And P Target Date 2040 C000153962 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       282,903.2825     316,801.234745   317,367.478936   355,880.65724   448,081.876272   386,968.316267 431,197.277901 515,007.988942 577,887.7606 680,655.147595
John Hancock 2040 Lifetime C000153962 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       289,450.83     329,682.926547   333,773.490536   385,701.996895   492,829.634996   419,868.44991 460,327.343228 551,361.471477 616,623.846219 735,659.965781
S And P Target Date 2040 C000106465 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,131,613.13     1,267,204.938979   1,269,469.915743   1,423,522.628958   1,792,327.505087   1,547,873.265067 1,724,789.111601 2,060,031.955763 2,311,551.042394 2,722,620.590375
John Hancock 2040 Lifetime C000106465 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,157,803.32     1,318,731.706186   1,335,093.962142   1,542,807.98758   1,971,318.539984   1,679,473.799639 1,841,309.372909 2,205,445.885906 2,466,495.384875 2,942,639.863123
John Hancock 2045 Lifetime C000153963 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       289,450.83     330,018.278489   332,750.090594   385,713.130569   499,627.494272   424,359.206817 470,158.352444 569,134.673624 643,647.79414 778,927.460491
S And P Target Date 2045 C000153963 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       284,493.9225     319,680.796551   319,126.0193   358,653.031876   456,701.586971   393,040.683133 441,636.001302 531,689.318208 601,021.498964 717,221.270642
John Hancock 2045 Lifetime C000106466 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,157,803.32     1,320,073.113956   1,331,000.362376   1,542,852.522275   1,998,509.977087   1,697,436.827266 1,880,633.409772 2,276,538.694491 2,574,591.176555 3,115,709.841958
S And P Target Date 2045 C000106466 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,137,975.69     1,278,723.186202   1,276,504.077197   1,434,612.127499   1,826,806.347876   1,572,162.732524 1,766,544.005197 2,126,757.272819 2,404,085.995843 2,868,885.082552
John Hancock 2045 Lifetime Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           John Hancock 2045 Lifetime Index                                
Accumulated Value     10,000       11,578.0332     13,200.73114   13,310.003624   15,428.525223   19,985.099771   16,974.368273 18,806.334098 22,765.386945 25,745.911766 31,157.09842
S And P Target Date 2045 Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           S&P Target Date 2045 Index                                
Accumulated Value     10,000       11,379.7569     12,787.231862   12,765.040772   14,346.121275   18,268.063479   15,721.627325 17,665.440052 21,267.572728 24,040.859958 28,688.850825
S And P Target Date 2050 Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           S&P Target Date 2050 Index                                
Accumulated Value     10,000       11,437.7045     12,892.952467   12,834.388164   14,441.048982   18,502.923264   15,897.286101 17,927.26525 21,685.841542 24,565.146624 29,457.518626
John Hancock 2050 Lifetime Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           John Hancock 2050 Lifetime Index                                
Accumulated Value     10,000       11,578.0332     13,200.73114   13,310.003624   15,428.525223   19,985.310062   16,960.890522 18,859.889661 22,950.562952 26,154.414491 32,020.692473
S And P Target Date 2050 C000106467 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,143,770.45     1,289,295.246655   1,283,438.816391   1,444,104.898188   1,850,292.326395   1,589,728.610115 1,792,726.525007 2,168,584.154206 2,456,514.662404 2,945,751.862575
John Hancock 2050 Lifetime C000106467 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,157,803.32     1,320,073.113956   1,331,000.362376   1,542,852.522275   1,998,531.006167   1,696,089.052133 1,885,988.966073 2,295,056.295136 2,615,441.449072 3,202,069.247296
S And P Target Date 2050 C000153964 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       285,942.6125     322,323.811664   320,859.704098   361,026.224547   462,573.081599   397,432.152529 448,181.631252 542,146.038552 614,128.665602 736,437.965645
John Hancock 2050 Lifetime C000153964 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       289,450.83     330,018.278489   332,750.090594   385,713.130569   499,632.751542   424,022.263033 471,497.241518 573,764.073784 653,860.362268 800,517.311824
John Hancock 2055 Lifetime C000138477 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,157,803.32     1,320,073.113956   1,331,000.362376   1,542,852.522275   1,998,531.006167   1,696,089.052133 1,885,988.966073 2,295,056.295136 2,615,441.449072 3,201,967.820476
S And P Target Date 2055 C000138477 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,147,615.08     1,294,734.972319   1,288,184.105358   1,449,500.077357   1,861,920.594347   1,599,034.759525 1,804,587.38385 2,184,454.670325 2,480,885.343844 2,987,557.103412
John Hancock 2055 Lifetime C000153974 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       289,450.83     330,018.278489   332,750.090594   385,713.130569   499,632.751542   424,022.263033 471,497.241518 573,764.073784 653,860.362268 800,491.955119
S And P Target Date 2055 C000153974 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       286,903.77     323,683.74308   322,046.02634   362,375.01934   465,480.148588   399,758.689882 451,146.845963 546,113.667582 620,221.335962 746,889.275854
John Hancock 2055 Lifetime Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           John Hancock 2055 Lifetime Index                                
Accumulated Value     10,000       11,578.0332     13,200.73114   13,310.003624   15,428.525223   19,985.310062   16,960.890522 18,859.889661 22,950.562952 26,154.414491 32,019.678205
S And P Target Date 2055 Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           S&P Target Date 2055 Index                                
Accumulated Value     10,000       11,476.1508     12,947.349723   12,881.841053   14,495.000773   18,619.205943   15,990.347595 18,045.873838 21,844.546703 24,808.853438 29,875.571034
John Hancock 2060 Lifetime Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           John Hancock 2060 Lifetime Index                                
Accumulated Value     10,000       11,578.0332     13,200.73114   13,310.003624   15,428.525223   19,985.310062   16,960.890522 18,859.889661 22,950.562952 26,154.414491 32,019.678205
John Hancock 2060 Lifetime C000167619 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       289,450.83     330,018.278489   332,750.090594   385,713.130569   499,632.751542   424,022.263033 471,497.241518 573,764.073784 653,860.362268 800,491.955119
S And P Target Date 2060 C000167619 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     250,000       287,602.8775     325,277.22662   323,639.143518   364,818.829556   468,214.012857   401,890.289944 453,941.962854 549,665.045017 624,153.090479 751,586.726556
S And P Target Date 2060 Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           S&P Target Date 2060+ Index                                
Accumulated Value   10,000 10,000   13,322.5848   11,504.1151   11,435.406291 13,011.089065 12,916.48718 12,945.565741 15,640.196519 14,592.753183 17,759.683068 18,728.560515 21,385.686085 16,075.611598 18,157.678514 21,986.601801 24,966.12362 30,063.469063
S And P Target Date 2060 C000167625 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     1,000,000       1,150,411.51     1,301,108.906481   1,294,556.574072   1,459,275.318224   1,872,856.05143   1,607,561.159776 1,815,767.851414 2,198,660.180068 2,496,612.361914 3,006,346.90622
John Hancock 2060 Lifetime C000167625 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value     $ 1,000,000       $ 1,157,803.32     $ 1,320,073.113956   $ 1,331,000.362376   $ 1,542,852.522275   $ 1,998,531.006167   $ 1,696,089.052133 $ 1,885,988.966073 $ 2,295,056.295136 $ 2,615,441.449072 $ 3,201,967.820476
John Hancock 2065 Lifetime C000221535 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value   250,000     336,853.85       285,877.039381   317,884.807551   386,833.402433   440,834.552404   539,693.997529          
S And P Target Date 2060 C000221535 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value   250,000     333,064.62       285,885.15727   322,912.17949   391,004.912963   443,992.076685   534,642.152098          
John Hancock 2065 Lifetime C000221539 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value   1,000,000     1,347,415.4       1,143,508.157523   1,271,539.230202   1,547,333.609731   1,763,338.209616   2,158,775.990114          
S And P Target Date 2060 C000221539 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value   1,000,000     1,332,258.48       1,143,540.629081   1,291,648.717963   1,564,019.651856   1,775,968.306744   2,138,568.608397          
John Hancock 2065 Lifetime Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           John Hancock 2065 Lifetime Index                                
Accumulated Value   $ 10,000     $ 13,474.154       $ 11,435.081575   $ 12,715.392302   $ 15,473.336097   $ 17,633.382096   $ 21,587.759901          
S And P Target Date 2065 Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           S&P Target Date 2065+ Index                                
Accumulated Value 10,000     11,527.1433       13,903.940884                            
John Hancock 2070 Lifetime Index [Member]                                            
Account Value [Line Items]                                            
Line Graph and Table Measure Name           John Hancock 2070 Lifetime Index                                
Accumulated Value 10,000     11,633.0444       14,241.815215                            
John Hancock 2070 Lifetime C000259698 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value 1,000,000     1,163,304.44       1,424,181.521486                            
S And P Target Date 2065 C000259698 Index [Member]                                            
Account Value [Line Items]                                            
Accumulated Value $ 1,000,000     $ 1,152,714.33       $ 1,390,394.088448