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Shareholder Report, Line Graph (Details) - USD ($)
 12 Months Ended 27 Months Ended 60 Months Ended 87 Months Ended 120 Months Ended
Sep. 30, 2024
Sep. 30, 2024
Sep. 30, 2024
Sep. 30, 2024
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Jun. 28, 2022
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Jul. 12, 2017
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
C000007072 [Member]                                  
Account Value [Line Items]                                  
Line Graph and Table Measure Name Investor Shares                                
Account Value $ 15,545 $ 15,545 $ 15,545 $ 15,545 $ 15,545 $ 13,375 $ 12,498   $ 14,565 $ 13,426 $ 12,506 $ 11,715 $ 11,340   $ 10,773 $ 10,018 $ 10,000
Average Annual Return, Percent 16.22%   4.45%   4.51%                        
C000007075 [Member]                                  
Account Value [Line Items]                                  
Line Graph and Table Measure Name Investor Shares                                
Account Value $ 19,202.03378 19,202.03378 $ 19,202.03378 19,202.03378 $ 19,202.03378 15,852.45814 14,209.48251   17,229.24696 14,862.13545 13,630.59872 12,994.73089 12,168.54676   10,889.60334 9,839.842941 10,000
Average Annual Return, Percent 21.13%   7.09%   6.74%                        
C000007076 [Member]                                  
Account Value [Line Items]                                  
Line Graph and Table Measure Name Investor Shares                                
Account Value $ 21,453 21,453 $ 21,453 21,453 $ 21,453 17,195 15,003   18,493 15,333 13,976 13,520 12,460   10,857 9,725 10,000
Average Annual Return, Percent 24.76%   8.95%   7.93%                        
C000007077 [Member]                                  
Account Value [Line Items]                                  
Line Graph and Table Measure Name Investor Shares                                
Account Value $ 23,612 23,612 $ 23,612 23,612 $ 23,612 18,473 15,699   19,607 15,634 14,178 13,892 12,647   10,824 9,651 10,000
Average Annual Return, Percent 27.82%   10.74%   8.97%                        
C000034438 [Member]                                  
Account Value [Line Items]                                  
Line Graph and Table Measure Name Investor Shares                                
Account Value $ 17,887 17,887 $ 17,887 17,887 $ 17,887 15,127 13,833   16,435 14,497 13,360 12,690 11,986   10,880 9,887 10,000
Average Annual Return, Percent 18.25%   6.01%   5.99%                        
C000034439 [Member]                                  
Account Value [Line Items]                                  
Line Graph and Table Measure Name Investor Shares                                
Account Value $ 20,329 20,329 $ 20,329 20,329 $ 20,329 16,492 14,576   17,867 15,104 13,809 13,259 12,316   10,875 9,784 10,000
Average Annual Return, Percent 23.27%   8.04%   7.35%                        
C000034440 [Member]                                  
Account Value [Line Items]                                  
Line Graph and Table Measure Name Investor Shares                                
Account Value $ 22,593 22,593 $ 22,593 22,593 $ 22,593 17,884 15,397   19,107 15,534 14,127 13,765 12,586   10,826 9,657 10,000
Average Annual Return, Percent 26.33%   9.85%   8.49%                        
C000034441 [Member]                                  
Account Value [Line Items]                                  
Line Graph and Table Measure Name Investor Shares                                
Account Value $ 23,953 23,953 $ 23,953 23,953 $ 23,953 18,581 15,683   19,648 15,637 14,182 13,895 12,649   10,827 9,654 10,000
Average Annual Return, Percent 28.91%   11.05%   9.13%                        
C000091317 [Member]                                  
Account Value [Line Items]                                  
Line Graph and Table Measure Name Investor Shares                                
Account Value $ 23,914 23,914 $ 23,914 23,914 $ 23,914 18,549 15,656   19,611 15,612 14,160 13,870 12,634   10,811 9,642 10,000
Average Annual Return, Percent 28.92%   11.05%   9.11%                        
C000108861 [Member]                                  
Account Value [Line Items]                                  
Line Graph and Table Measure Name Investor Shares                                
Account Value $ 23,907 23,907 $ 23,907 23,907 $ 23,907 18,542 15,649   19,601 15,606 14,155 13,868 12,628   10,809 9,639 10,000
Average Annual Return, Percent 28.93%   11.05%   9.11%                        
C000180147 [Member]                                  
Account Value [Line Items]                                  
Line Graph and Table Measure Name Investor Shares                                
Account Value $ 19,660 19,660 $ 19,660 $ 19,660 $ 19,660 15,246 12,869   16,106 12,825 11,647 11,408 10,395 $ 10,000      
Average Annual Return, Percent 28.95%   11.04% 9.82%                          
C000234832 [Member]                                  
Account Value [Line Items]                                  
Line Graph and Table Measure Name Investor Shares                                
Account Value $ 14,136 $ 14,136 $ 14,136 $ 14,136 14,136 10,960 9,250 $ 10,000                  
Average Annual Return, Percent 28.98% 16.56%                              
Target Retirement Income Composite Index [Member]                                  
Account Value [Line Items]                                  
Line Graph and Table Measure Name Target Retirement Income Composite Index                                
Account Value $ 15,891 $ 15,891 $ 15,891 15,891 $ 15,891 13,659 12,728   14,805 13,619 12,602 11,797 11,401   10,813 10,031 10,000
Average Annual Return, Percent 16.34%   4.75%   4.74%                        
Bloomberg U S Aggregate Bond Index [Member]                                  
Account Value [Line Items]                                  
Line Graph and Table Measure Name Bloomberg U.S. Aggregate Bond Index                                
Account Value $ 12,004 12,004 $ 12,004 12,004 $ 12,004 10,760 10,691   12,518 12,632 11,807 10,705 10,836   10,829 10,294 10,000
Average Annual Return, Percent 11.57%   0.33%   1.84%                        
Target Retirement 2025 Composite Index [Member]                                  
Account Value [Line Items]                                  
Line Graph and Table Measure Name Target Retirement 2025 Composite Index                                
Account Value $ 19,786.92163 19,786.92163 $ 19,786.92163 19,786.92163 $ 19,786.92163 16,317.5141 14,581.29407   17,586.36132 15,116.50782 13,752.39766 13,094.63386 12,229.28123   10,922.32105 9,838.988864 10,000
Average Annual Return, Percent 21.26%   7.55%   7.06%                        
MSCI US Broad Market Index [Member]                                  
Account Value [Line Items]                                  
Line Graph and Table Measure Name MSCI US Broad Market Index                                
Account Value $ 33,680 $ 33,680 $ 33,680 $ 33,680 $ 33,680 24,899 20,634 10,000 25,063 18,923 16,456 15,990 13,594 10,000 11,456 9,959 10,000
Average Annual Return, Percent 35.26% 21.14% 15.40% 13.96% 12.91%                        
Target Retirement 2035 Composite Index [Member]                                  
Account Value [Line Items]                                  
Line Graph and Table Measure Name Target Retirement 2035 Composite Index                                
Account Value $ 22,117 $ 22,117 $ 22,117 $ 22,117 $ 22,117 17,700 15,392   18,882 15,594 14,110 13,624 12,522   10,895 9,726 10,000
Average Annual Return, Percent 24.96%   9.41%   8.26%                        
Bloomberg U S Aggregate Float Adjusted Index [Member]                                  
Account Value [Line Items]                                  
Line Graph and Table Measure Name Bloomberg U.S. Aggregate Float Adjusted Index                                
Account Value $ 12,038 $ 12,038 $ 12,038 $ 12,038 $ 12,038 10,799 10,716 10,000 12,549 12,666 11,822 10,705 10,839 10,000 10,833 10,283 10,000
Average Annual Return, Percent 11.47% 3.52% 0.36% 1.57% 1.87%                        
Target Retirement 2045 Composite Index [Member]                                  
Account Value [Line Items]                                  
Line Graph and Table Measure Name Target Retirement 2045 Composite Index                                
Account Value $ 24,379 $ 24,379 $ 24,379 $ 24,379 $ 24,379 19,035 16,135   20,055 15,919 14,349 14,023 12,731   10,880 9,663 10,000
Average Annual Return, Percent 28.08%   11.18%   9.32%                        
Target Retirement 2020 Composite Index [Member]                                  
Account Value [Line Items]                                  
Line Graph and Table Measure Name Target Retirement 2020 Composite Index                                
Account Value $ 18,365 18,365 $ 18,365 18,365 $ 18,365 15,519 14,150   16,752 14,740 13,484 12,788 12,051   10,924 9,894 10,000
Average Annual Return, Percent 18.34%   6.37%   6.27%                        
Target Retirement 2030 Composite Index [Member]                                  
Account Value [Line Items]                                  
Line Graph and Table Measure Name Target Retirement 2030 Composite Index                                
Account Value $ 20,953 20,953 $ 20,953 20,953 $ 20,953 16,978 14,958   18,233 15,361 13,933 13,359 12,377   10,910 9,783 10,000
Average Annual Return, Percent 23.41%   8.50%   7.68%                        
Target Retirement 2040 Composite Index [Member]                                  
Account Value [Line Items]                                  
Line Graph and Table Measure Name Target Retirement 2040 Composite Index                                
Account Value $ 23,314 23,314 $ 23,314 23,314 $ 23,314 18,428 15,821   19,534 15,815 14,283 13,889 12,666   10,877 9,667 10,000
Average Annual Return, Percent 26.51%   10.30%   8.83%                        
Target Retirement 2050 Composite Index [Member]                                  
Account Value [Line Items]                                  
Line Graph and Table Measure Name Target Retirement 2050 Composite Index                                
Account Value $ 24,749 24,749 $ 24,749 24,749 $ 24,749 19,147 16,125   20,108 15,923 14,349 14,023 12,731   10,880 9,663 10,000
Average Annual Return, Percent 29.26%   11.52%   9.49%                        
Target Retirement 2055 Composite Index [Member]                                  
Account Value [Line Items]                                  
Line Graph and Table Measure Name Target Retirement 2055 Composite Index                                
Account Value $ 24,749 24,749 $ 24,749 24,749 $ 24,749 19,147 16,125   20,108 15,923 14,349 14,023 12,731   10,880 9,663 10,000
Average Annual Return, Percent 29.26%   11.52%   9.49%                        
Target Retirement 2060 Composite Index [Member]                                  
Account Value [Line Items]                                  
Line Graph and Table Measure Name Target Retirement 2060 Composite Index                                
Account Value $ 24,749 24,749 $ 24,749 24,749 $ 24,749 19,147 16,125   20,108 15,923 14,349 14,023 12,731   $ 10,880 $ 9,663 $ 10,000
Average Annual Return, Percent 29.26%   11.52%   9.49%                        
Target Retirement 2065 Composite Index [Member]                                  
Account Value [Line Items]                                  
Line Graph and Table Measure Name Target Retirement 2065 Composite Index                                
Account Value $ 20,187 20,187 $ 20,187 $ 20,187 $ 20,187 15,617 13,153   $ 16,402 $ 12,988 $ 11,704 $ 11,439 $ 10,384 $ 10,000      
Average Annual Return, Percent 29.26%   11.52% 10.22%                          
Target Retirement 2070 Composite Index [Member]                                  
Account Value [Line Items]                                  
Line Graph and Table Measure Name Target Retirement 2070 Composite Index                                
Account Value $ 14,195 $ 14,195 $ 14,195 $ 14,195 $ 14,195 $ 10,982 $ 9,249 $ 10,000                  
Average Annual Return, Percent 29.26% 16.78%