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
Jan. 31, 2016
Apr. 30, 2016
Jul. 31, 2016
Oct. 31, 2016
Jan. 31, 2026
Jan. 31, 2017
Apr. 30, 2017
Jul. 31, 2017
Oct. 31, 2017
Jan. 31, 2018
Apr. 30, 2018
Jul. 31, 2018
Oct. 31, 2018
Jan. 31, 2019
Apr. 30, 2019
Jul. 31, 2019
Oct. 31, 2019
Jan. 31, 2020
Apr. 30, 2020
Jul. 31, 2020
Oct. 31, 2020
Jan. 31, 2021
Apr. 30, 2021
Jul. 31, 2021
Oct. 31, 2021
Jan. 31, 2022
Apr. 30, 2022
Jul. 31, 2022
Oct. 31, 2022
Jan. 31, 2023
Apr. 30, 2023
Jul. 31, 2023
Oct. 31, 2023
Jan. 31, 2024
Apr. 30, 2024
Jul. 31, 2024
Oct. 31, 2024
Jan. 31, 2025
Apr. 30, 2025
Jul. 31, 2025
Oct. 31, 2025
Jan. 31, 2026
C000008004                                                                                    
Account Value [Line Items]                                                                                    
Line Graph and Table Measure Name         Investor Shares                                                                          
Accumulated Value $ 10,000 $ 10,644 $ 11,065 $ 10,615   $ 11,206 $ 11,861 $ 12,328 $ 12,553 $ 13,856 $ 13,241 $ 14,018 $ 13,805 $ 14,082 $ 15,546 $ 16,307 $ 16,476 $ 17,368 $ 15,604 $ 16,937 $ 17,126 $ 18,589 $ 21,238 $ 22,348 $ 23,082 $ 23,359 $ 22,873 $ 22,743 $ 22,405 $ 23,181 $ 23,571 $ 24,080 $ 22,582 $ 25,294 $ 25,463 $ 26,973 $ 27,450 $ 27,873 $ 26,716 $ 27,793 $ 28,723 $ 29,708
C000008005                                                                                    
Account Value [Line Items]                                                                                    
Line Graph and Table Measure Name         Investor Shares                                                                          
Accumulated Value 10,000 12,053 12,177 12,439   13,273 12,622 12,569 13,222 14,434 14,754 15,131 13,434 12,777 13,490 12,684 12,219 11,940 8,641 8,879 7,547 9,128 10,196 10,341 11,482 12,445 12,892 13,335 13,841 14,525 14,639 15,159 15,034 15,107 16,782 17,482 17,569 17,561 18,039 19,275 20,385 22,408
C000008006                                                                                    
Account Value [Line Items]                                                                                    
Accumulated Value 50,000 60,277 60,903 62,235   66,417 63,168 62,920 66,199 72,286 73,907 75,808 67,322 64,047 67,631 63,600 61,288 59,883 43,352 44,549 37,875 45,825 51,195 51,929 57,682 62,519 64,778 67,030 69,580 73,039 73,612 76,242 75,629 76,024 84,468 88,022 88,468 88,438 90,858 97,114 102,717 112,936
C000008007                                                                                    
Account Value [Line Items]                                                                                    
Line Graph and Table Measure Name         Investor Shares                                                                          
Accumulated Value 10,000 10,275 11,100 9,814   10,271 11,188 11,848 11,688 12,560 11,698 12,837 12,557 12,906 12,559 12,949 13,585 14,604 14,737 15,939 15,228 16,964 17,266 18,605 18,769 17,724 17,698 18,181 18,230 18,889 19,592 19,611 17,927 20,102 20,362 22,230 21,175 20,697 19,700 18,570 21,286 23,055
C000008008                                                                                    
Account Value [Line Items]                                                                                    
Accumulated Value 50,000 51,383 55,513 49,088   51,382 55,976 59,287 58,489 62,864 58,557 64,270 62,876 64,628 62,894 64,856 68,054 73,169 73,846 79,875 76,324 85,030 86,560 93,278 94,112 88,883 88,772 91,200 91,459 94,775 98,318 98,427 89,980 100,920 102,235 111,623 106,339 103,955 98,961 93,297 106,965 115,867
C000031350                                                                                    
Account Value [Line Items]                                                                                    
Line Graph and Table Measure Name         ETF Shares Net Asset Value                                                                          
Accumulated Value 10,000 10,718 11,328 10,998   11,659 12,366 12,690 13,212 14,702 13,795 14,742 14,429 14,574 16,001 16,630 16,973 17,880 16,279 17,717 18,175 19,924 22,301 23,388 24,173 24,050 22,858 22,856 22,274 23,563 23,877 25,314 23,428 26,546 27,051 29,478 30,335 31,679 30,072 32,544 34,432 35,690
C000135474                                                                                    
Account Value [Line Items]                                                                                    
Line Graph and Table Measure Name         Admiral Shares                                                                          
Accumulated Value 10,000 10,718 11,326 10,994   11,658 12,366 12,689 13,210 14,702 13,796 14,742 14,428 14,571 15,995 16,623 16,966 17,872 16,273 17,711 18,165 19,915 22,290 23,376 24,156 24,033 22,840 22,838 22,259 23,547 23,860 25,292 23,411 26,523 27,027 29,451 30,303 31,647 30,042 32,507 34,389 35,645
NACC2 Index: Dow Jones U.S. Total Stock Market Float Adjusted Index                                                                                    
Account Value [Line Items]                                                                                    
Line Graph and Table Measure Name         Dow Jones U.S. Total Stock Market Float Adjusted Index                                                                          
Accumulated Value 10,000 10,765 11,417 11,215   12,172 12,764 13,258 13,901 15,235 14,431 15,436 14,813 14,881 16,247 16,502 16,797 17,913 16,055 18,284 18,475 21,593 24,245 25,402 26,617 25,587 23,429 23,425 22,107 23,433 23,728 26,381 23,963 27,919 29,048 31,949 33,068 35,256 32,317 36,974 39,980 40,665
NACC2 Index: Dow Jones U.S. Total Stock Market Float Adjusted Index                                                                                    
Account Value [Line Items]                                                                                    
Line Graph and Table Measure Name         Dow Jones U.S. Total Stock Market Float Adjusted Index                                                                          
Accumulated Value 10,000 10,765 11,417 11,215   12,172 12,764 13,258 13,901 15,235 14,431 15,436 14,813 14,881 16,247 16,502 16,797 17,913 16,055 18,284 18,475 21,593 24,245 25,402 26,617 25,587 23,429 23,425 22,107 23,433 23,728 26,381 23,963 27,919 29,048 31,949 33,068 35,256 32,317 36,974 39,980 40,665
NACC2 Index: Dow Jones U.S. Total Stock Market Float Adjusted Index                                                                                    
Account Value [Line Items]                                                                                    
Line Graph and Table Measure Name         Dow Jones U.S. Total Stock Market Float Adjusted Index                                                                          
Accumulated Value 50,000 53,827 57,084 56,073   60,862 63,818 66,290 69,507 76,175 72,156 77,182 74,067 74,404 81,235 82,511 83,987 89,564 80,274 91,422 92,375 107,965 121,223 127,008 133,086 127,935 117,147 117,125 110,536 117,165 118,641 131,906 119,815 139,596 145,242 159,745 165,337 176,278 161,587 184,871 199,899 203,323
NACC2 Index: Dow Jones U.S. Total Stock Market Float Adjusted Index                                                                                    
Account Value [Line Items]                                                                                    
Line Graph and Table Measure Name         Dow Jones U.S. Total Stock Market Float Adjusted Index                                                                          
Accumulated Value 10,000 10,765 11,417 11,215   12,172 12,764 13,258 13,901 15,235 14,431 15,436 14,813 14,881 16,247 16,502 16,797 17,913 16,055 18,284 18,475 21,593 24,245 25,402 26,617 25,587 23,429 23,425 22,107 23,433 23,728 26,381 23,963 27,919 29,048 31,949 33,068 35,256 32,317 36,974 39,980 40,665
NACC2 Index: Dow Jones U.S. Total Stock Market Float Adjusted Index                                                                                    
Account Value [Line Items]                                                                                    
Line Graph and Table Measure Name         Dow Jones U.S. Total Stock Market Float Adjusted Index                                                                          
Accumulated Value 50,000 53,827 57,084 56,073   60,862 63,818 66,290 69,507 76,175 72,156 77,182 74,067 74,404 81,235 82,511 83,987 89,564 80,274 91,422 92,375 107,965 121,223 127,008 133,086 127,935 117,147 117,125 110,536 117,165 118,641 131,906 119,815 139,596 145,242 159,745 165,337 176,278 161,587 184,871 199,899 203,323
NACC2 Index: Dow Jones U.S. Total Stock Market Float Adjusted Index                                                                                    
Account Value [Line Items]                                                                                    
Line Graph and Table Measure Name         Dow Jones U.S. Total Stock Market Float Adjusted Index                                                                          
Accumulated Value 10,000 10,765 11,417 11,215   12,172 12,764 13,258 13,901 15,235 14,431 15,436 14,813 14,881 16,247 16,502 16,797 17,913 16,055 18,284 18,475 21,593 24,245 25,402 26,617 25,587 23,429 23,425 22,107 23,433 23,728 26,381 23,963 27,919 29,048 31,949 33,068 35,256 32,317 36,974 39,980 40,665
NACC2 Index: Dow Jones U.S. Total Stock Market Float Adjusted Index                                                                                    
Account Value [Line Items]                                                                                    
Line Graph and Table Measure Name         Dow Jones U.S. Total Stock Market Float Adjusted Index                                                                          
Accumulated Value 10,000 10,765 11,417 11,215   12,172 12,764 13,258 13,901 15,235 14,431 15,436 14,813 14,881 16,247 16,502 16,797 17,913 16,055 18,284 18,475 21,593 24,245 25,402 26,617 25,587 23,429 23,425 22,107 23,433 23,728 26,381 23,963 27,919 29,048 31,949 33,068 35,256 32,317 36,974 39,980 40,665
NACC2 Index: Dividend Growth Spliced Index                                                                                    
Account Value [Line Items]                                                                                    
Line Graph and Table Measure Name         Dividend Growth Spliced Index                                                                          
Accumulated Value 10,000 10,722 11,335 11,005   11,667 12,376 12,702 13,227 14,723 13,816 14,765 14,454 14,600 16,030 16,662 17,008 17,918 16,317 17,776 18,238 19,995 22,384 23,479 24,267 24,149 22,956 22,959 22,381 23,681 24,001 25,447 23,554 26,694 27,204 29,648 30,515 31,871 30,261 32,750 34,654 35,926
NACC2 Index: Spliced Energy Index                                                                                    
Account Value [Line Items]                                                                                    
Line Graph and Table Measure Name         Spliced Energy Index                                                                          
Accumulated Value 10,000 11,847 11,807 12,114   12,854 12,403 12,485 13,276 14,619 14,631 15,214 13,830 13,448 13,944 13,381 12,963 12,509 8,923 8,902 7,525 8,976 9,914 10,024 10,971 11,676 12,132 12,314 12,507 13,063 13,001 13,209 12,669 13,078 14,216 14,664 14,566 14,294 14,402 15,537 16,265 17,804
NACC2 Index: Spliced Energy Index                                                                                    
Account Value [Line Items]                                                                                    
Line Graph and Table Measure Name         Spliced Energy Index                                                                          
Accumulated Value 50,000 59,233 59,034 60,571   64,271 62,014 62,427 66,380 73,095 73,155 76,069 69,152 67,241 69,721 66,906 64,816 62,547 44,614 44,512 37,626 44,881 49,568 50,122 54,857 58,381 60,660 61,570 62,535 65,316 65,005 66,047 63,345 65,390 71,081 73,318 72,828 71,471 72,010 77,687 81,323 89,019
NACC2 Index: MSCI All Country World Index Health Care Index                                                                                    
Account Value [Line Items]                                                                                    
Line Graph and Table Measure Name         MSCI All Country World Index Health Care Index                                                                          
Accumulated Value 10,000 10,448 11,160 9,964   10,327 11,153 11,711 11,855 12,832 12,117 13,029 12,736 12,983 13,010 13,354 14,009 14,931 14,982 16,136 15,443 17,580 18,172 19,678 19,855 18,891 18,733 18,824 18,345 19,104 19,517 19,566 18,023 20,334 20,449 22,078 21,562 21,322 20,718 19,800 21,574 23,308
NACC2 Index: MSCI All Country World Index Health Care Index                                                                                    
Account Value [Line Items]                                                                                    
Line Graph and Table Measure Name         MSCI All Country World Index Health Care Index                                                                          
Accumulated Value 50,000 52,240 55,798 49,819   51,634 55,765 58,557 59,275 64,158 60,585 65,144 63,679 64,915 65,049 66,769 70,045 74,657 74,911 80,682 77,217 87,901 90,861 98,391 99,276 94,455 93,666 94,120 91,723 95,522 97,583 97,832 90,116 101,669 102,247 110,388 107,809 106,612 103,589 99,001 107,869 116,541
NACC2 Index: Spliced S&P U.S. Dividend Growers Index TR                                                                                    
Account Value [Line Items]                                                                                    
Line Graph and Table Measure Name         Spliced S&P U.S. Dividend Growers Index TR                                                                          
Accumulated Value 10,000 10,722 11,335 11,005   11,667 12,376 12,702 13,227 14,723 13,816 14,765 14,454 14,600 16,030 16,662 17,008 17,918 16,317 17,776 18,238 19,995 22,384 23,479 24,267 24,149 22,956 22,959 22,381 23,681 24,001 25,447 23,554 26,694 27,204 29,648 30,515 31,871 30,261 32,750 34,654 35,926
NACC2 Index: Spliced S&P U.S. Dividend Growers Index TR                                                                                    
Account Value [Line Items]                                                                                    
Line Graph and Table Measure Name         Spliced S&P U.S. Dividend Growers Index TR                                                                          
Accumulated Value $ 10,000 $ 10,722 $ 11,335 $ 11,005   $ 11,667 $ 12,376 $ 12,702 $ 13,227 $ 14,723 $ 13,816 $ 14,765 $ 14,454 $ 14,600 $ 16,030 $ 16,662 $ 17,008 $ 17,918 $ 16,317 $ 17,776 $ 18,238 $ 19,995 $ 22,384 $ 23,479 $ 24,267 $ 24,149 $ 22,956 $ 22,959 $ 22,381 $ 23,681 $ 24,001 $ 25,447 $ 23,554 $ 26,694 $ 27,204 $ 29,648 $ 30,515 $ 31,871 $ 30,261 $ 32,750 $ 34,654 $ 35,926