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
C000129667                                                                                  
Account Value [Line Items]                                                                                  
Accumulated Value $ 10,000 $ 10,354 $ 10,272 $ 10,783 $ 11,167 $ 11,448 $ 11,804 $ 11,918 $ 11,918 $ 12,150 $ 11,735 $ 12,109 $ 12,191 $ 12,677 $ 13,083 $ 12,896 $ 12,885 $ 14,073 $ 14,693 $ 15,384 $ 16,123 $ 16,579 $ 16,373 $ 15,873 $ 15,069 $ 14,536 $ 14,684 $ 14,681 $ 14,925 $ 15,378 $ 15,512 $ 16,407 $ 16,789 $ 17,514 $ 17,857 $ 17,935 $ 18,069 $ 18,862 $ 19,412 $ 20,120 $ 20,523
C000129666                                                                                  
Account Value [Line Items]                                                                                  
Accumulated Value 10,000 10,346 10,255 10,766 11,131 11,402 11,758 11,862 11,853 12,074 11,650 12,011 12,092 12,566 12,959 12,774 12,753 13,921 14,515 15,189 15,911 16,352 16,137 15,638 14,831 14,293 14,439 14,425 14,654 15,087 15,208 16,077 16,439 17,138 17,474 17,528 17,646 18,421 18,933 19,604 19,997
C000169044                                                                                  
Account Value [Line Items]                                                                                  
Accumulated Value 500,000 517,711 514,078 539,642 558,848 572,901 591,170 596,901 597,385 609,488 588,671 607,248 611,829 636,770 657,131 648,234 647,706 707,933 739,103 773,833 811,541 835,041 825,204 800,505 759,936 733,082 741,081 741,330 753,696 776,573 783,992 829,739 849,080 885,829 904,525 908,300 915,124 956,069 984,731 1,020,570 1,041,801
Russell 3000 Index                                                                                  
Account Value [Line Items]                                                                                  
Accumulated Value 10,000 10,445 10,693 11,520 11,769 12,123 13,074 13,389 13,542 14,577 13,797 14,065 13,880 14,768 15,934 15,036 15,471 17,935 18,966 20,347 22,264 23,861 23,961 22,849 21,444 20,692 21,373 21,004 21,880 23,745 24,067 27,012 27,916 29,953 32,367 31,748 31,578 34,698 36,765 37,150 40,876
Russell 3000 Index                                                                                  
Account Value [Line Items]                                                                                  
Accumulated Value 10,000 10,445 10,693 11,520 11,769 12,123 13,074 13,389 13,542 14,577 13,797 14,065 13,880 14,768 15,934 15,036 15,471 17,935 18,966 20,347 22,264 23,861 23,961 22,849 21,444 20,692 21,373 21,004 21,880 23,745 24,067 27,012 27,916 29,953 32,367 31,748 31,578 34,698 36,765 37,150 40,876
Russell 3000 Index                                                                                  
Account Value [Line Items]                                                                                  
Accumulated Value 500,000 522,241 534,647 575,993 588,456 606,127 653,724 669,441 677,086 728,858 689,853 703,243 693,987 738,405 796,715 751,784 773,543 896,730 948,279 1,017,369 1,113,218 1,193,037 1,198,049 1,142,441 1,072,208 1,034,579 1,068,629 1,050,213 1,094,023 1,187,255 1,203,368 1,350,596 1,395,788 1,497,655 1,618,354 1,587,401 1,578,892 1,734,883 1,838,256 1,857,519 2,043,802
S&P Target Date 2025 Index                                                                                  
Account Value [Line Items]                                                                                  
Accumulated Value 10,000 10,334 10,295 10,816 11,135 11,382 11,866 11,952 12,024 12,351 11,881 12,190 12,186 12,678 13,215 12,859 12,932 13,981 14,571 15,119 15,890 16,352 16,180 15,740 14,966 14,455 14,695 14,787 15,049 15,489 15,616 16,508 16,850 17,705 17,987 18,082 18,336 19,313 20,010 20,790 21,405
S&P Target Date 2025 Index                                                                                  
Account Value [Line Items]                                                                                  
Accumulated Value 10,000 10,334 10,295 10,816 11,135 11,382 11,866 11,952 12,024 12,351 11,881 12,190 12,186 12,678 13,215 12,859 12,932 13,981 14,571 15,119 15,890 16,352 16,180 15,740 14,966 14,455 14,695 14,787 15,049 15,489 15,616 16,508 16,850 17,705 17,987 18,082 18,336 19,313 20,010 20,790 21,405
S&P Target Date 2025 Index                                                                                  
Account Value [Line Items]                                                                                  
Accumulated Value $ 500,000 $ 516,703 $ 514,734 $ 540,787 $ 556,748 $ 569,107 $ 593,302 $ 597,605 $ 601,214 $ 617,571 $ 594,057 $ 609,495 $ 609,305 $ 633,880 $ 660,734 $ 642,969 $ 646,594 $ 699,041 $ 728,564 $ 755,935 $ 794,524 $ 817,583 $ 808,982 $ 786,996 $ 748,305 $ 722,740 $ 734,761 $ 739,352 $ 752,429 $ 774,466 $ 780,795 $ 825,379 $ 842,515 $ 885,236 $ 899,330 $ 904,081 $ 916,814 $ 965,653 $ 1,000,512 $ 1,039,493 $ 1,070,227