Shareholder Report, Average Annual Return (Details)
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12 Months Ended |
60 Months Ended |
120 Months Ended |
Jan. 31, 2026 |
Jan. 31, 2026 |
Jan. 31, 2026 |
| C000008004 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Investor Shares
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| C000008005 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Investor Shares
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| C000008007 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Investor Shares
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| C000031350 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
ETF Shares Net Asset Value
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| Average Annual Return, Percent |
12.69%
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12.38%
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13.57%
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| C000135474 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Admiral Shares
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| Without Sales Load [Member] | C000008004 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
6.58%
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9.83%
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11.50%
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| Without Sales Load [Member] | C000008005 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
27.60%
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19.67%
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8.40%
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| Without Sales Load [Member] | C000008006 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
27.70%
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19.77%
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8.49%
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| Without Sales Load [Member] | C000008007 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
11.39%
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6.33%
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8.71%
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| Without Sales Load [Member] | C000008008 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
11.46%
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6.38%
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8.77%
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| Without Sales Load [Member] | C000031350 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
12.66%
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12.37%
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13.57%
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| Without Sales Load [Member] | C000135474 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
12.63%
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12.35%
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13.55%
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| NACC2 Index: Dow Jones U.S. Total Stock Market Float Adjusted Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Dow Jones U.S. Total Stock Market Float Adjusted Index
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| Average Annual Return, Percent |
15.34%
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13.50%
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15.06%
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| NACC2 Index: Dow Jones U.S. Total Stock Market Float Adjusted Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Dow Jones U.S. Total Stock Market Float Adjusted Index
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| Average Annual Return, Percent |
15.34%
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13.50%
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15.06%
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| NACC2 Index: Dow Jones U.S. Total Stock Market Float Adjusted Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Dow Jones U.S. Total Stock Market Float Adjusted Index
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| Average Annual Return, Percent |
15.34%
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13.50%
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15.06%
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| NACC2 Index: Dow Jones U.S. Total Stock Market Float Adjusted Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Dow Jones U.S. Total Stock Market Float Adjusted Index
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| Average Annual Return, Percent |
15.34%
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13.50%
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15.06%
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| NACC2 Index: Dow Jones U.S. Total Stock Market Float Adjusted Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Dow Jones U.S. Total Stock Market Float Adjusted Index
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| Average Annual Return, Percent |
15.34%
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13.50%
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15.06%
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| NACC2 Index: Dow Jones U.S. Total Stock Market Float Adjusted Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Dow Jones U.S. Total Stock Market Float Adjusted Index
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| Average Annual Return, Percent |
15.34%
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13.50%
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15.06%
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| NACC2 Index: Dow Jones U.S. Total Stock Market Float Adjusted Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Dow Jones U.S. Total Stock Market Float Adjusted Index
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| Average Annual Return, Percent |
15.34%
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13.50%
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15.06%
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| NACC2 Index: Dividend Growth Spliced Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Dividend Growth Spliced Index
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| Average Annual Return, Percent |
12.72%
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12.43%
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13.64%
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| NACC2 Index: Spliced Energy Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Spliced Energy Index
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| Average Annual Return, Percent |
24.55%
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14.68%
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5.94%
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| NACC2 Index: Spliced Energy Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Spliced Energy Index
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| Average Annual Return, Percent |
24.55%
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14.68%
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5.94%
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| NACC2 Index: MSCI All Country World Index Health Care Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
MSCI All Country World Index Health Care Index
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| Average Annual Return, Percent |
9.31%
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5.80%
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8.83%
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| NACC2 Index: MSCI All Country World Index Health Care Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
MSCI All Country World Index Health Care Index
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| Average Annual Return, Percent |
9.31%
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5.80%
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8.83%
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| NACC2 Index: Spliced S&P U.S. Dividend Growers Index TR |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Spliced S&P U.S. Dividend Growers Index TR
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| Average Annual Return, Percent |
12.72%
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12.43%
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13.64%
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| NACC2 Index: Spliced S&P U.S. Dividend Growers Index TR |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Spliced S&P U.S. Dividend Growers Index TR
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| Average Annual Return, Percent |
12.72%
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12.43%
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13.64%
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