v3.26.1
Shareholder Report, Line Graph (Details) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 15 Months Ended 18 Months Ended 21 Months Ended 24 Months Ended 27 Months Ended 30 Months Ended 33 Months Ended 36 Months Ended 39 Months Ended 42 Months Ended 45 Months Ended 48 Months Ended 51 Months Ended 54 Months Ended 57 Months Ended 60 Months Ended 63 Months Ended 66 Months Ended 69 Months Ended 72 Months Ended 75 Months Ended 78 Months Ended 81 Months Ended 84 Months Ended 87 Months Ended 90 Months Ended 93 Months Ended 96 Months Ended 99 Months Ended 102 Months Ended 105 Months Ended 108 Months Ended 111 Months Ended 114 Months Ended 117 Months Ended 120 Months Ended
May 31, 2016
Aug. 31, 2016
Nov. 30, 2016
Feb. 28, 2017
May 31, 2017
Aug. 31, 2017
Nov. 30, 2017
Feb. 28, 2018
May 31, 2018
Aug. 31, 2018
Nov. 30, 2018
Feb. 28, 2019
May 31, 2019
Aug. 31, 2019
Nov. 30, 2019
Feb. 29, 2020
May 31, 2020
Aug. 31, 2020
Nov. 30, 2020
Feb. 28, 2021
May 31, 2021
Aug. 31, 2021
Nov. 30, 2021
Feb. 28, 2022
May 31, 2022
Aug. 31, 2022
Nov. 30, 2022
Feb. 28, 2023
May 31, 2023
Aug. 31, 2023
Nov. 30, 2023
Feb. 29, 2024
May 31, 2024
Aug. 31, 2024
Nov. 30, 2024
Feb. 28, 2025
May 31, 2025
Aug. 31, 2025
Nov. 30, 2025
Feb. 28, 2026
May 31, 2026
C000129660                                                                                  
Account Value [Line Items]                                                                                  
Accumulated Value $ 10,000 $ 10,325 $ 10,186 $ 10,574 $ 10,832 $ 11,041 $ 11,260 $ 11,303 $ 11,303 $ 11,490 $ 11,195 $ 11,536 $ 11,692 $ 12,116 $ 12,406 $ 12,369 $ 12,337 $ 13,245 $ 13,673 $ 14,112 $ 14,653 $ 15,002 $ 14,845 $ 14,442 $ 13,775 $ 13,338 $ 13,386 $ 13,399 $ 13,596 $ 13,899 $ 14,030 $ 14,717 $ 15,004 $ 15,617 $ 15,903 $ 16,001 $ 16,100 $ 16,754 $ 17,194 $ 17,741 $ 18,025
C000129661                                                                                  
Account Value [Line Items]                                                                                  
Accumulated Value 10,000 10,317 10,168 10,556 10,804 11,004 11,213 11,256 11,246 11,423 11,119 11,446 11,589 12,010 12,287 12,240 12,198 13,085 13,507 13,941 14,452 14,796 14,630 14,228 13,548 13,118 13,154 13,164 13,344 13,639 13,754 14,423 14,688 15,285 15,550 15,631 15,728 16,349 16,762 17,286 17,561
C000169041                                                                                  
Account Value [Line Items]                                                                                  
Accumulated Value 500,000 516,249 509,285 529,169 542,029 552,508 563,939 566,082 566,082 575,435 560,668 578,275 586,055 607,837 622,359 621,004 619,398 664,903 686,852 709,381 736,470 755,093 747,192 728,035 693,947 672,033 674,468 675,811 685,730 701,600 708,213 743,590 758,696 789,593 804,011 809,762 814,782 847,775 870,727 898,396 914,264
Bloomberg U.S. Aggregate Bond Index                                                                                  
Account Value [Line Items]                                                                                  
Accumulated Value 10,000 10,232 9,908 10,008 10,158 10,283 10,227 10,059 10,120 10,175 10,089 10,378 10,768 11,210 11,178 11,590 11,781 11,936 11,992 11,750 11,734 11,925 11,854 11,440 10,769 10,552 10,332 10,328 10,538 10,426 10,454 10,671 10,676 11,187 11,173 11,291 11,258 11,538 11,809 11,998 11,836
Bloomberg U.S. Aggregate Bond Index                                                                                  
Account Value [Line Items]                                                                                  
Accumulated Value 10,000 10,232 9,908 10,008 10,158 10,283 10,227 10,059 10,120 10,175 10,089 10,378 10,768 11,210 11,178 11,590 11,781 11,936 11,992 11,750 11,734 11,925 11,854 11,440 10,769 10,552 10,332 10,328 10,538 10,426 10,454 10,671 10,676 11,187 11,173 11,291 11,258 11,538 11,809 11,998 11,836
Bloomberg U.S. Aggregate Bond Index                                                                                  
Account Value [Line Items]                                                                                  
Accumulated Value 500,000 511,616 495,403 500,416 507,893 514,136 511,326 502,944 505,990 508,741 504,464 518,886 538,376 560,492 558,902 579,506 589,067 596,775 599,611 587,524 586,682 596,272 592,695 571,989 538,444 527,606 516,596 516,381 526,907 521,310 522,690 533,562 533,786 559,349 558,625 564,552 562,924 576,891 590,474 599,896 591,821
S&P Target Date 2010 Index                                                                                  
Account Value [Line Items]                                                                                  
Accumulated Value 10,000 10,272 10,167 10,513 10,743 10,924 11,207 11,228 11,287 11,512 11,206 11,476 11,591 12,021 12,348 12,251 12,394 13,121 13,495 13,750 14,208 14,547 14,431 14,067 13,427 13,054 13,165 13,245 13,488 13,743 13,853 14,490 14,729 15,424 15,599 15,738 15,920 16,608 17,114 17,650 17,969
S&P Target Date 2010 Index                                                                                  
Account Value [Line Items]                                                                                  
Accumulated Value 10,000 10,272 10,167 10,513 10,743 10,924 11,207 11,228 11,287 11,512 11,206 11,476 11,591 12,021 12,348 12,251 12,394 13,121 13,495 13,750 14,208 14,547 14,431 14,067 13,427 13,054 13,165 13,245 13,488 13,743 13,853 14,490 14,729 15,424 15,599 15,738 15,920 16,608 17,114 17,650 17,969
S&P Target Date 2010 Index                                                                                  
Account Value [Line Items]                                                                                  
Accumulated Value $ 500,000 $ 513,589 $ 508,331 $ 525,640 $ 537,168 $ 546,218 $ 560,334 $ 561,421 $ 564,357 $ 575,583 $ 560,318 $ 573,790 $ 579,527 $ 601,038 $ 617,377 $ 612,568 $ 619,689 $ 656,065 $ 674,725 $ 687,514 $ 710,409 $ 727,372 $ 721,532 $ 703,352 $ 671,338 $ 652,677 $ 658,230 $ 662,250 $ 674,392 $ 687,131 $ 692,658 $ 724,481 $ 736,460 $ 771,213 $ 779,969 $ 786,885 $ 796,010 $ 830,375 $ 855,708 $ 882,506 $ 898,457