S000000588 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended | 407 Months Ended | ||
|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
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| Russell Midcap® Growth Index (reflects no deduction for fees, expenses or taxes) | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | 8.66% | 6.65% | 12.49% | 10.22% | ||
| Russell 3000 Index (reflects no deduction for fees, expenses or taxes) | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | 17.15% | 13.15% | 14.29% | 10.68% | ||
| Retail Shares | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | 24.55% | 12.29% | 24.05% | 15.79% | ||
| Performance Inception Date | Jan. 31, 1992 | |||||
| Retail Shares | After Taxes on Distributions | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | 23.49% | 11.51% | 23.48% | 15.47% | ||
| Performance Inception Date | Jan. 31, 1992 | |||||
| Retail Shares | After Taxes on Distributions and Sales | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | 15.17% | 9.65% | 20.96% | 14.66% | ||
| Performance Inception Date | Jan. 31, 1992 | |||||
| Institutional Shares | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | [1] | 24.86% | 12.58% | 24.37% | 15.93% | |
| Performance Inception Date | [1] | May 29, 2009 | ||||
| R6 Shares | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | [1] | 24.86% | 12.58% | 24.37% | 15.93% | |
| Performance Inception Date | [1] | Aug. 31, 2016 | ||||
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