Shareholder Report, Average Annual Return (Details)
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12 Months Ended |
60 Months Ended |
120 Months Ended |
Jun. 30, 2026 |
Jun. 30, 2026 |
Jun. 30, 2026 |
| C000132936 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Meridian Hedged Equity Fund (Investor Class/(MRIEX))
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| Average Annual Return, Percent |
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6.41%
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5.50%
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13.85%
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| C000156527 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Meridian Hedged Equity Fund (Class C/(MRCEX))
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| Average Annual Return, Percent |
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5.35%
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4.53%
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12.96%
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| C000132937 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Meridian Hedged Equity Fund (Class A/(MRAEX))
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| Average Annual Return, Percent |
[1] |
0.06%
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3.93%
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12.86%
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| C000003881 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Meridian Hedged Equity Fund (Legacy Class/(MEIFX))
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| Average Annual Return, Percent |
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6.41%
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5.48%
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13.89%
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| C000003882 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Meridian Growth Fund (Legacy Class/(MERDX))
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| Average Annual Return, Percent |
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7.32%
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(2.36%)
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7.63%
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| C000132941 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Meridian Growth Fund (Institutional Class/(MRRGX))
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| Average Annual Return, Percent |
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7.40%
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(2.32%)
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7.67%
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| C000132940 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Meridian Growth Fund (Class A/(MRAGX))
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| Average Annual Return, Percent |
[2] |
0.87%
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(3.73%)
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6.71%
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| C000156528 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Meridian Growth Fund (Class C/(MRCGX))
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| Average Annual Return, Percent |
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6.23%
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(3.29%)
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6.57%
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| C000132939 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Meridian Growth Fund (Investor Class/(MRIGX))
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| Average Annual Return, Percent |
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7.24%
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(2.42%)
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7.58%
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| C000132942 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Meridian Contrarian Fund (Investor Class/(MFCIX))
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| Average Annual Return, Percent |
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29.73%
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8.38%
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13.83%
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| C000156529 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Meridian Contrarian Fund (Class C/(MFCCX))
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| Average Annual Return, Percent |
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28.43%
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7.29%
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12.75%
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| C000132943 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Meridian Contrarian Fund (Class A/(MFCAX))
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| Average Annual Return, Percent |
[3] |
22.11%
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6.86%
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12.88%
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| C000003883 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Meridian Contrarian Fund (Legacy Class/(MVALX))
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| Average Annual Return, Percent |
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29.81%
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8.42%
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13.93%
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| C000132293 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Meridian Small Cap Growth Fund (Legacy Class/(MSGGX))
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| Average Annual Return, Percent |
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17.09%
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(0.32%)
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9.37%
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| C000132296 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Meridian Small Cap Growth Fund (Institutional Class/(MSGRX))
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| Average Annual Return, Percent |
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17.25%
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(0.20%)
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9.49%
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| C000132295 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Meridian Small Cap Growth Fund (Class A/(MSGAX))
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| Average Annual Return, Percent |
[4] |
10.12%
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(1.78%)
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8.39%
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| C000156530 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Meridian Small Cap Growth Fund (Class C/(MSGCX))
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| Average Annual Return, Percent |
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15.94%
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(1.33%)
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8.26%
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| C000132294 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Meridian Small Cap Growth Fund (Investor Class/(MISGX))
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| Average Annual Return, Percent |
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17.03%
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(0.35%)
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9.32%
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| Without Sales Load [Member] | C000132937 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Meridian Hedged Equity Fund (Class A/(MRAEX))
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| Average Annual Return, Percent |
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6.16%
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5.17%
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13.53%
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| Without Sales Load [Member] | C000132940 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Meridian Growth Fund (Class A/(MRAGX))
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| Average Annual Return, Percent |
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7.01%
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(2.58%)
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7.34%
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| Without Sales Load [Member] | C000132943 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Meridian Contrarian Fund (Class A/(MFCAX))
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| Average Annual Return, Percent |
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29.57%
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8.13%
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13.55%
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| Without Sales Load [Member] | C000132295 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Meridian Small Cap Growth Fund (Class A/(MSGAX))
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| Average Annual Return, Percent |
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16.80%
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(0.61%)
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9.04%
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| CBOE S And P 500 Buy Write Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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CBOE S&P 500 Buy Write Index
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| Average Annual Return, Percent |
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17.34%
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8.39%
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7.72%
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| Standard & Poor's 500 Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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S&P 500® Index
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| Average Annual Return, Percent |
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22.33%
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13.41%
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15.51%
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| Russell 3000 Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Russell 3000® Index
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| Average Annual Return, Percent |
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22.82%
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12.31%
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15.06%
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| Russell 2500 Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Russell 2500® Index
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| Average Annual Return, Percent |
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36.72%
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8.30%
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12.25%
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| Russell 2500 Growth Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Russell 2500® Growth Index
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| Average Annual Return, Percent |
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32.94%
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4.98%
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12.56%
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| Russell 2500 Value Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Russell 2500® Value Index
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| Average Annual Return, Percent |
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38.54%
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10.28%
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11.28%
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| Russell 2000 Growth Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Russell 2000® Growth Index
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| Average Annual Return, Percent |
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38.74%
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5.57%
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11.97%
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