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
C000129672                                                                                  
Account Value [Line Items]                                                                                  
Accumulated Value $ 10,000 $ 10,410 $ 10,366 $ 11,026 $ 11,545 $ 11,925 $ 12,463 $ 12,653 $ 12,633 $ 12,941 $ 12,355 $ 12,809 $ 12,788 $ 13,397 $ 13,986 $ 13,580 $ 13,558 $ 15,149 $ 16,081 $ 17,155 $ 18,269 $ 18,946 $ 18,575 $ 17,747 $ 16,582 $ 15,801 $ 16,242 $ 16,188 $ 16,536 $ 17,401 $ 17,546 $ 19,024 $ 19,642 $ 20,643 $ 21,236 $ 21,151 $ 21,368 $ 22,670 $ 23,640 $ 24,972 $ 25,812
C000129673                                                                                  
Account Value [Line Items]                                                                                  
Accumulated Value 10,000 10,403 10,349 10,992 11,511 11,881 12,401 12,581 12,562 12,859 12,274 12,704 12,674 13,270 13,857 13,443 13,412 14,982 15,888 16,944 18,028 18,678 18,310 17,474 16,319 15,535 15,972 15,911 16,243 17,074 17,204 18,639 19,248 20,210 20,771 20,682 20,870 22,138 23,067 24,355 25,153
C000169047                                                                                  
Account Value [Line Items]                                                                                  
Accumulated Value 500,000 520,499 518,271 550,828 577,698 596,692 623,561 633,066 632,585 648,436 619,136 641,933 640,916 671,945 701,956 681,545 681,013 761,352 808,171 862,640 919,125 953,675 935,577 894,050 835,396 796,673 819,451 817,218 834,812 878,494 886,988 961,418 993,945 1,044,612 1,074,636 1,071,241 1,082,245 1,148,914 1,198,754 1,266,891 1,310,221
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 2040 Index                                                                                  
Account Value [Line Items]                                                                                  
Accumulated Value 10,000 10,375 10,393 11,040 11,427 11,741 12,450 12,622 12,704 13,148 12,464 12,795 12,634 13,171 13,996 13,269 13,239 14,769 15,664 16,681 17,966 18,596 18,312 17,802 16,876 16,060 16,566 16,674 16,980 17,895 18,061 19,575 20,185 21,373 21,946 21,929 22,379 23,983 25,096 26,470 27,843
S&P Target Date 2040 Index                                                                                  
Account Value [Line Items]                                                                                  
Accumulated Value 10,000 10,375 10,393 11,040 11,427 11,741 12,450 12,622 12,704 13,148 12,464 12,795 12,634 13,171 13,996 13,269 13,239 14,769 15,664 16,681 17,966 18,596 18,312 17,802 16,876 16,060 16,566 16,674 16,980 17,895 18,061 19,575 20,185 21,373 21,946 21,929 22,379 23,983 25,096 26,470 27,843
S&P Target Date 2040 Index                                                                                  
Account Value [Line Items]                                                                                  
Accumulated Value $ 500,000 $ 518,762 $ 519,658 $ 552,000 $ 571,345 $ 587,038 $ 622,487 $ 631,117 $ 635,212 $ 657,378 $ 623,177 $ 639,764 $ 631,688 $ 658,553 $ 699,792 $ 663,466 $ 661,969 $ 738,469 $ 783,222 $ 834,045 $ 898,304 $ 929,791 $ 915,587 $ 890,084 $ 843,808 $ 802,978 $ 828,301 $ 833,722 $ 849,009 $ 894,755 $ 903,064 $ 978,772 $ 1,009,263 $ 1,068,666 $ 1,097,295 $ 1,096,468 $ 1,118,964 $ 1,199,145 $ 1,254,784 $ 1,323,496 $ 1,392,152