Defined Benefit Plan, Equity Securities, US, Small Cap [Member] Defined Benefit Plan, Equity Securities, US, Mid Cap [Member] Defined Benefit Plan, Equity Securities, US, Large Cap [Member] John Hancock Lifestyle Aggressive C000106452 Index [Member] Morningstar U S Aggressive Target Allocation C000106452 Index [Member] John Hancock Lifestyle Aggressive C000155628 Index [Member] Morningstar U S Aggressive Target Allocation C000155628 Index [Member] John Hancock Lifestyle Aggressive Index [Member] Morningstar U S Aggressive Target Allocation Index [Member] C000106452 [Member] Class R6 C000009055 [Member] Class R5 C000009054 [Member] Class R4 C000113497 [Member] Class R2 C000155628 [Member] Class I C000009052 [Member] Class C C000009050 [Member] Class A C000009056 [Member] Class 1 Standard & Poor's 500 Index [Member] C000009068 [Member] C000034075 [Member] Class 5 C000009062 [Member] C000009064 [Member] C000155629 [Member] C000113498 [Member] C000009066 [Member] C000009067 [Member] C000106453 [Member] Multi asset income [Member] Morningstar U S Moderate Target Allocation Index [Member] John Hancock Lifestyle Balanced Index [Member] Morningstar U S Moderate Target Allocation C000155629 Index [Member] John Hancock Lifestyle Balanced C000155629 Index [Member] Morningstar U S Moderate Target Allocation C000106453 Index [Member] John Hancock Lifestyle Balanced C000106453 Index [Member] John Hancock Lifestyle Conservative C000155630 Index [Member] Morningstar U S Conservative Target Allocation C000155630 Index [Member] John Hancock Lifestyle Conservative C000106454 Index [Member] Morningstar U S Conservative Target Allocation C000106454 Index [Member] Short term investments and other [Member] Bank loan [Member] Multi sector bond [Member] Alternative and specialty [Member] High yield bond [Member] Emerging market debt [Member] Intermediate bond [Member] Short term bond [Member] Emerging market equity [Member] Large blend [Member] International equity [Member] Affiliated investment companies [Member] Bloomberg U S Aggregate Bond Index [Member] John Hancock Lifestyle Conservative Index [Member] Morningstar U S Conservative Target Allocation Index [Member] C000106454 [Member] C000009076 [Member] C000009075 [Member] C000113499 [Member] C000155630 [Member] C000009073 [Member] C000009071 [Member] C000009077 [Member] Fixed Income Securities [Member] US Government Debt Securities [Member] Equity [Member] C000009086 [Member] C000034076 [Member] C000009080 [Member] C000009082 [Member] C000155631 [Member] C000113500 [Member] C000009084 [Member] C000009085 [Member] C000106455 [Member] Morningstar U S Moderately Aggressive Target Allocation Index [Member] John Hancock Lifestyle Growth Index [Member] Morningstar U S Moderately Aggressive Target Allocation C000155631 Index [Member] John Hancock Lifestyle Growth C000155631 Index [Member] Morningstar U S Moderately Aggressive Target Allocation C000106455 Index [Member] John Hancock Lifestyle Growth C000106455 Index [Member] John Hancock Lifestyle Moderate C000155632 Index [Member] Morningstar U S Moderately Conservative Target Allocation C000155632 Index [Member] John Hancock Lifestyle Moderate C000106456 Index [Member] Morningstar U S Moderately Conservative Target Allocation C000106456 Index [Member] John Hancock Lifestyle Moderate Index [Member] Morningstar U S Moderately Conservative Target Allocation Index [Member] C000106456 [Member] C000009104 [Member] C000009103 [Member] C000113501 [Member] C000155632 [Member] C000009101 [Member] C000009099 [Member] C000034077 [Member] C000009105 [Member] C000037309 [Member] C000037307 [Member] C000153956 [Member] C000113503 [Member] C000106459 [Member] S And P Target Date 2010 Index [Member] John Hancock 2010 Lifetime Index [Member] S And P Target Date 2010 C000153956 Index [Member] John Hancock 2010 Lifetime C000153956 Index [Member] S And P Target Date 2010 C000106459 Index [Member] John Hancock 2010 Lifetime C000106459 Index [Member] John Hancock 2015 Lifetime C000153957 Index [Member] S And P Target Date 2015 C000153957 Index [Member] John Hancock 2015 Lifetime C000106460 Index [Member] S And P Target Date 2015 C000106460 Index [Member] John Hancock 2015 Lifetime Index [Member] S And P Target Date 2015 Index [Member] C000106460 [Member] C000037339 [Member] C000037338 [Member] C000113504 [Member] C000153957 [Member] C000037330 [Member] C000037340 [Member] C000037351 [Member] C000037341 [Member] C000153958 [Member] C000113505 [Member] C000037349 [Member] C000037350 [Member] C000106461 [Member] S And P Target Date 2020 Index [Member] John Hancock 2020 Lifetime Index [Member] Bloomberg U S Aggregate Bond C000153958 Index [Member] S And P Target Date 2020 C000153958 Index [Member] John Hancock 2020 Lifetime C000153958 Index [Member] Bloomberg U S Aggregate Bond C000106461 Index [Member] S And P Target Date 2020 C000106461 Index [Member] John Hancock 2020 Lifetime C000106461 Index [Member] John Hancock 2025 Lifetime C000106462 Index [Member] S And P Target Date 2025 C000106462 Index [Member] John Hancock 2025 Lifetime C000153959 Index [Member] S And P Target Date 2025 C000153959 Index [Member] John Hancock 2025 Lifetime Index [Member] S And P Target Date 2025 Index [Member] C000106462 [Member] C000037361 [Member] C000037360 [Member] C000113506 [Member] C000153959 [Member] C000037352 [Member] C000037362 [Member] C000037373 [Member] C000037363 [Member] C000153960 [Member] C000113507 [Member] C000037371 [Member] C000037372 [Member] C000106463 [Member] S And P Target Date 2030 Index [Member] John Hancock 2030 Lifetime Index [Member] S And P Target Date 2030 C000106463 Index [Member] John Hancock 2030 Lifetime C000106463 Index [Member] S And P Target Date 2030 C000153960 Index [Member] John Hancock 2030 Lifetime C000153960 Index [Member] John Hancock 2035 Lifetime C000106464 Index [Member] S And P Target Date 2035 C000106464 Index [Member] John Hancock 2035 Lifetime C000153961 Index [Member] S And P Target Date 2035 C000153961 Index [Member] John Hancock 2035 Lifetime Index [Member] S And P Target Date 2035 Index [Member] C000106464 [Member] C000037383 [Member] C000037382 [Member] C000113508 [Member] C000153961 [Member] C000037374 [Member] C000037384 [Member] C000037395 [Member] C000037385 [Member] C000153962 [Member] C000113509 [Member] C000037393 [Member] C000037394 [Member] C000106465 [Member] S And P Target Date 2040 Index [Member] John Hancock 2040 Lifetime Index [Member] S And P Target Date 2040 C000153962 Index [Member] John Hancock 2040 Lifetime C000153962 Index [Member] S And P Target Date 2040 C000106465 Index [Member] John Hancock 2040 Lifetime C000106465 Index [Member] John Hancock 2045 Lifetime C000153963 Index [Member] S And P Target Date 2045 C000153963 Index [Member] John Hancock 2045 Lifetime C000106466 Index [Member] S And P Target Date 2045 C000106466 Index [Member] John Hancock 2045 Lifetime Index [Member] S And P Target Date 2045 Index [Member] C000106466 [Member] C000037405 [Member] C000037404 [Member] C000113510 [Member] C000153963 [Member] C000037396 [Member] C000037406 [Member] C000037417 [Member] C000037407 [Member] C000153964 [Member] C000113511 [Member] C000037415 [Member] C000037416 [Member] C000106467 [Member] S And P Target Date 2050 Index [Member] John Hancock 2050 Lifetime Index [Member] Absolute return [Member] Sector equity [Member] Unaffiliated investment companies [Member] Equity Unaffiliated [Member] S And P Target Date 2050 C000106467 Index [Member] John Hancock 2050 Lifetime C000106467 Index [Member] S And P Target Date 2050 C000153964 Index [Member] John Hancock 2050 Lifetime C000153964 Index [Member] John Hancock 2055 Lifetime C000138477 Index [Member] S And P Target Date 2055 C000138477 Index [Member] John Hancock 2055 Lifetime C000153974 Index [Member] S And P Target Date 2055 C000153974 Index [Member] John Hancock 2055 Lifetime Index [Member] S And P Target Date 2055 Index [Member] C000138477 [Member] C000138476 [Member] C000138475 [Member] C000138473 [Member] C000153974 [Member] C000138479 [Member] C000138478 [Member] C000167626 [Member] C000167627 [Member] C000167619 [Member] C000167621 [Member] C000167623 [Member] C000167624 [Member] C000167625 [Member] John Hancock 2060 Lifetime Index [Member] Standard And Poor s 500 C000167619 Index [Member] John Hancock 2060 Lifetime C000167619 Index [Member] S And P Target Date 2060 C000167619 Index [Member] S And P Target Date 2060 Index [Member] Standard And Poor s 500 C000167625 Index [Member] S And P Target Date 2060 C000167625 Index [Member] John Hancock 2060 Lifetime C000167625 Index [Member] John Hancock 2065 Lifetime C000221535 Index [Member] S And P Target Date 2060 C000221535 Index [Member] Standard And Poor s 500 C000221535 Index [Member] John Hancock 2065 Lifetime C000221539 Index [Member] S And P Target Date 2060 C000221539 Index [Member] Standard And Poor s 500 C000221539 Index [Member] John Hancock 2065 Lifetime Index [Member] C000221539 [Member] C000221538 [Member] C000221537 [Member] C000221536 [Member] C000221535 [Member] C000221534 [Member] C000221540 [Member] C000259699 [Member] C000259695 [Member] C000259698 [Member] S And P Target Date 2065 Index [Member] John Hancock 2070 Lifetime Index [Member] John Hancock 2070 Lifetime C000259698 Index [Member] S And P Target Date 2065 C000259698 Index [Member] Standard And poor s 500 C000259698 index [Member] Investment Type [Axis] Net Assets Investment Company Portfolio Turnover No Trading Symbol Flag