Shareholder Report, Line Graph (Details) - USD ($) |
12 Months Ended | 24 Months Ended | 36 Months Ended | 48 Months Ended | 60 Months Ended | 72 Months Ended | 84 Months Ended | 96 Months Ended | 108 Months Ended | 120 Months Ended | |||||||||||||
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Jul. 01, 2016 |
Jun. 30, 2016 |
Jun. 30, 2026 |
Jun. 30, 2017 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2018 |
Jun. 30, 2019 |
Jun. 30, 2019 |
Jun. 30, 2020 |
Jun. 30, 2020 |
Jun. 30, 2021 |
Jun. 30, 2021 |
Jun. 30, 2022 |
Jun. 30, 2022 |
Jun. 30, 2023 |
Jun. 30, 2023 |
Jun. 30, 2024 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2026 |
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| C000132936 [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Hedged Equity Fund (Investor Class/(MRIEX)) | ||||||||||||||||||||||
| Accumulated Value | $ 10,000 | $ 11,798.37 | $ 16,313.5 | $ 18,152.65 | $ 20,993.79 | $ 27,998.14 | $ 24,205.62 | $ 26,959.99 | $ 30,825.54 | $ 34,380.23 | $ 36,585.18 | ||||||||||||
| C000156527 [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Hedged Equity Fund (Class C/(MRCEX)) | ||||||||||||||||||||||
| Accumulated Value | 10,000 | 11,725.96 | 16,135.61 | 17,799.57 | 20,483.19 | 27,093.61 | 23,239.12 | 25,703.63 | 29,135.35 | 32,100.73 | 33,816.7 | ||||||||||||
| C000132937 [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Hedged Equity Fund (Class A/(MRAEX)) | ||||||||||||||||||||||
| Accumulated Value | 10,000 | 11,768.75 | 16,269.74 | 18,047.67 | 20,814.38 | 27,637.09 | 23,824.49 | 26,455.94 | 30,182.25 | 33,501.55 | 35,565.87 | ||||||||||||
| C000003881 [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Hedged Equity Fund (Legacy Class/(MEIFX)) | ||||||||||||||||||||||
| Accumulated Value | 10,000 | 11,805.51 | 16,384 | 18,229.57 | 21,109.57 | 28,110.29 | 24,310.48 | 27,110.31 | 31,006.21 | 34,498.01 | 36,710.46 | ||||||||||||
| C000003882 [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Growth Fund (Legacy Class/(MERDX)) | ||||||||||||||||||||||
| Accumulated Value | 10,000 | 12,346.25 | 14,832.89 | 15,279.74 | 15,061.49 | 23,513 | 16,646.74 | 19,088.01 | 19,171.73 | 19,445.96 | 20,868.53 | ||||||||||||
| C000132941 [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Growth Fund (Institutional Class/(MRRGX)) | ||||||||||||||||||||||
| Accumulated Value | 1,000,000 | 1,234,769.2 | 1,483,919.66 | 1,528,409.69 | 1,507,363.8 | 2,353,432.75 | 1,666,973.67 | 1,911,913.05 | 1,920,852.44 | 1,948,863.79 | 2,093,027.62 | ||||||||||||
| C000132940 [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Growth Fund (Class A/(MRAGX)) | ||||||||||||||||||||||
| Accumulated Value | 10,000 | 12,308.97 | 14,746.93 | 15,140.71 | 14,875.61 | 23,149.59 | 16,336.35 | 18,702.12 | 18,725.43 | 18,982.62 | 20,313.77 | ||||||||||||
| C000156528 [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Growth Fund (Class C/(MRCGX)) | ||||||||||||||||||||||
| Accumulated Value | 10,000 | 12,220.49 | 14,530.59 | 14,816.49 | 14,457.95 | 22,336.44 | 15,654.54 | 17,776.93 | 17,676.83 | 17,789.38 | 18,897.01 | ||||||||||||
| C000132939 [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Growth Fund (Investor Class/(MRIGX)) | ||||||||||||||||||||||
| Accumulated Value | 10,000 | 12,340.58 | 14,815.82 | 15,256.5 | 15,036.25 | 23,458.36 | 16,597.36 | 19,022.16 | 19,095.72 | 19,356.76 | 20,758.79 | ||||||||||||
| C000132942 [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Contrarian Fund (Investor Class/(MFCIX)) | ||||||||||||||||||||||
| Accumulated Value | 10,000.01 | 12,306.87 | 15,438.08 | 15,420.45 | 14,655.15 | 24,422.64 | 20,219.67 | 23,384.73 | 24,085.61 | 28,151.98 | 36,521.22 | ||||||||||||
| C000156529 [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Contrarian Fund (Class C/(MFCCX)) | ||||||||||||||||||||||
| Accumulated Value | 10,000.01 | 12,212.42 | 15,199.07 | 15,042.63 | 14,157.51 | 23,362.84 | 19,155.88 | 21,933.56 | 22,356.1 | 25,857.31 | 33,209.18 | ||||||||||||
| C000132943 [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Contrarian Fund (Class A/(MFCAX)) | ||||||||||||||||||||||
| Accumulated Value | 10,000.01 | 12,275.6 | 15,365.08 | 15,299.67 | 14,501.66 | 24,104.45 | 19,909.66 | 22,961.99 | 23,591.9 | 27,502.24 | 35,634.35 | ||||||||||||
| C000003883 [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Contrarian Fund (Legacy Class/(MVALX)) | ||||||||||||||||||||||
| Accumulated Value | 10,000.01 | 12,335.78 | 15,509.56 | 15,502.56 | 14,743.06 | 24,586.98 | 20,363.68 | 23,563.56 | 24,275.29 | 28,381.1 | 36,840.86 | ||||||||||||
| C000132293 [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Small Cap Growth Fund (Legacy Class/(MSGGX)) | ||||||||||||||||||||||
| Accumulated Value | 10,000 | 12,695.87 | 15,826.12 | 15,590.36 | 15,408.64 | 24,887.17 | 16,827.63 | 19,562.68 | 20,409.69 | 20,921.38 | 24,497.45 | ||||||||||||
| C000132296 [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Small Cap Growth Fund (Institutional Class/(MSGRX)) | ||||||||||||||||||||||
| Accumulated Value | 1,000,000 | 1,271,885.52 | 1,585,504.52 | 1,563,851.95 | 1,546,784.43 | 2,499,432.05 | 1,690,734.58 | 1,967,596.87 | 2,055,117.66 | 2,110,926.65 | 2,475,046.36 | ||||||||||||
| C000132295 [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Small Cap Growth Fund (Class A/(MSGAX)) | ||||||||||||||||||||||
| Accumulated Value | 10,000 | 12,661.56 | 15,734.93 | 15,458.49 | 15,212.51 | 24,499.5 | 16,504.4 | 19,128.62 | 19,901.83 | 20,345.22 | 23,762.47 | ||||||||||||
| C000156530 [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Small Cap Growth Fund (Class C/(MSGCX)) | ||||||||||||||||||||||
| Accumulated Value | $ 10,000 | $ 12,572 | $ 15,512 | $ 15,132 | $ 14,791 | $ 23,657 | $ 15,827 | $ 18,206 | $ 18,816 | $ 19,082 | $ 22,123 | ||||||||||||
| C000132294 [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Small Cap Growth Fund (Investor Class/(MISGX)) | ||||||||||||||||||||||
| Accumulated Value | 10,000 | 12,700.42 | 15,819.25 | 15,572.47 | 15,359.16 | 24,806.4 | 16,758.44 | 19,475.48 | 20,310.84 | 20,825.43 | 24,371.33 | ||||||||||||
| CBOE S And P 500 Buy Write Index [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | CBOE S&P 500 Buy Write Index | ||||||||||||||||||||||
| Accumulated Value | 10,000 | 11,205.83 | 12,021.47 | 12,403.25 | 11,046.06 | 14,058.93 | 13,690.99 | 14,926.47 | 16,256.41 | 17,922.24 | 21,030.24 | ||||||||||||
| Standard & Poor's 500 Index [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | S&P 500® Index | ||||||||||||||||||||||
| Accumulated Value | 10,000 | 11,789.6 | 13,484.24 | 14,888.95 | 16,006.39 | 22,536.06 | 20,143.67 | 24,090.64 | 30,006.35 | 34,556.41 | 42,271.12 | ||||||||||||
| Russell 3000 Index [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | Russell 3000® Index | ||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,000 | 11,850.95 | 11,850.95 | 13,602.29 | 13,602.29 | 14,824.12 | 14,824.12 | 15,792.07 | 15,792.07 | 22,766.54 | 22,766.54 | 19,609.82 | 19,609.82 | 23,326.6 | 23,326.6 | 28,720.9 | 28,720.9 | 33,113.98 | 33,113.98 | 40,671.75 | 40,671.75 | |
| Russell 3000 C000132941 Index [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Accumulated Value | 1,000,000 | 1,185,094.58 | 1,360,229.17 | 1,482,411.78 | 1,579,206.75 | 2,276,654.43 | 1,960,981.98 | 2,332,659.97 | 2,872,089.76 | 3,311,398.11 | 4,067,175 | ||||||||||||
| Russell 2500 Index [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | Russell 2500® Index | ||||||||||||||||||||||
| Accumulated Value | 10,000 | 11,984.11 | 13,930.68 | 14,176.92 | 13,510.89 | 21,318.99 | 16,842.58 | 19,129.86 | 21,132.51 | 23,225.96 | 31,755.02 | ||||||||||||
| Russell 2500 Growth Index [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | Russell 2500® Growth Index | ||||||||||||||||||||||
| Accumulated Value | 10,000 | 12,143.56 | 14,758.58 | 15,663.62 | 17,106.84 | 25,597.3 | 17,455.95 | 20,699.79 | 22,567.66 | 24,555.3 | 32,644.29 | ||||||||||||
| Russell 2500 Growth C000132941 Index [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Accumulated Value | 1,000,000 | 1,214,355.91 | 1,475,858.3 | 1,566,361.56 | 1,710,684.07 | 2,559,730.48 | 1,745,594.69 | 2,069,979 | 2,256,766.17 | 2,455,529.89 | 3,264,428.99 | ||||||||||||
| Russell 2500 Value Index [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | Russell 2500® Value Index | ||||||||||||||||||||||
| Accumulated Value | 10,000 | 11,836.06 | 13,195.89 | 12,941.99 | 10,936.16 | 17,851.18 | 15,496 | 17,103.02 | 19,025.7 | 21,017.39 | 29,117.02 | ||||||||||||
| Russell 2000 Growth Index [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | Russell 2000® Growth Index | ||||||||||||||||||||||
| Accumulated Value | $ 10,000 | 10,000 | 12,440.17 | $ 12,440.17 | 15,159.86 | $ 15,159.86 | 15,085.55 | $ 15,085.55 | 15,610.31 | $ 15,610.31 | $ 23,627.78 | 23,627.78 | $ 15,728.81 | 15,728.81 | $ 18,643.64 | 18,643.64 | $ 20,347.04 | 20,347.04 | 22,326.36 | $ 22,326.36 | 30,976.01 | $ 30,976.01 | |
| Russell 2000 Growth C000132296 Index [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Accumulated Value | $ 1,000,000 | $ 1,244,016.93 | $ 1,515,986.4 | $ 1,508,555.27 | $ 1,561,030.75 | $ 2,362,777.78 | $ 1,572,881.46 | $ 1,864,363.63 | $ 2,034,703.58 | $ 2,232,636.25 | $ 3,097,600.95 | ||||||||||||