| Form N-CSR Cover | 12 Months Ended |
| Jun. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | MERIDIAN FUND INC |
| Entity Central Index Key | 0000745467 |
| Document Period End Date | Jun. 30, 2024 |
| Shareholder Report | 12 Months Ended |
| Jun. 30, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | MERIDIAN FUND INC |
| Entity Central Index Key | 0000745467 |
| Document Period End Date | Jun. 30, 2024 |
| C000132293 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Meridian Small Cap Growth Fund |
| Class Name | Legacy Class |
| Trading Symbol | MSGGX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Meridian Small Cap Growth Fund (“Fund”) for the period of July 1, 2023 to June 30, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can also request this information by contacting us at 1-800-446-6662. This report describes changes to the Fund that occurred during the reporting period. You can find additional information about the Fund at www.arrowmarkpartners.com/meridian/ |
| Additional Information Phone Number | 1-800-446-6662 |
| Additional Information Website | www.arrowmarkpartners.com/meridian/ |
| Expenses [Text Block] | What were the Fund expenses for the last year? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage Meridian Small Cap Growth Fund $ 1.23 % |
| Expenses Paid, Amount | $ 126 |
| Expense Ratio, Percent | 1.23% |
| Factors Affecting Performance [Text Block] | What drove fund performance during the past 12 months U.S. equities moved higher over the 12-month period ended June 30, 2024. In our view, resilient economic growth, a strong labor market, higher corporate earnings, and easing inflation gave investors the support they needed to look past higher interest rates and bid stocks higher. Small cap stocks, while delivering a respectable 10% index return over the period, were generally overshadowed by the market’s narrow focus on larger, AI-related companies. The investment strategy’s emphasis on downside protection proved effective during the period, as the strategy outperformed on nine of the ten days on which the index declined 2% or more. Our investment process focuses on what we believe are high-quality companies with recurring revenue and sustainable competitive advantages, which we are currently finding lower on the [small] capitalization spectrum. This process contrasted with the market’s appetite for larger, high-momentum companies during the period. From a sector perspective, stock selection was positive in the healthcare and consumer discretionary sectors. Conversely, an underweight position and negative stock selection in the information technology sector detracted from relative returns, as the information technology sector was one of the better-performing sectors of the market during the period. |
| Performance Past Does Not Indicate Future [Text] | Past performance is not predictive of future performance. |
| Line Graph [Table Text Block] | How has the Fund historically performed? This chart assumes an initial investment of $10,000 made on July 1, 2014 for Legacy Class including any applicable sales charges or fees. The performance of the other share class may be greater or less than that shown based on differences in inception dates, fees, and sales charges. Performance assumes reinvestment of dividends and capital gain distributions. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years Since Inception (1) Meridian Small Cap Growth Fund (Legacy Class/(MSGGX)) 4.33 % 5.54 % 8.04 % 9.19 % Russell 2000 ® 9.14 % 6.17 % 7.39 % 7.66 % Russell 3000 ® 23.13 % 14.14 % 12.15 % 12.58 % (1) Inception date of Legacy Class is 12/16/13 |
| Performance Inception Date | Dec. 16, 2013 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares |
| Updated Performance Information Location [Text Block] | To obtain a prospectus, please contact your investment representative or the Funds' transfer agent at 1-800-446-6662 or access our website at www.arrowmarkpartners.com/meridian |
| Net Assets | $ 441,206,126 |
| Holdings Count | Holding | 106 |
| Advisory Fees Paid, Amount | $ 5,479,951 |
| Investment Company Portfolio Turnover | 42% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fee paid $ % Portfolio turnover rate as of the end of the reporting period $ % |
| Holdings [Text Block] | Top Ten Holdings Cargurus, Inc. 2.9 % RB Global, Inc. (Canada) 2.9 % Turning Point Brands, Inc. 2.8 % ACV Auctions, Inc. Class A 2.7 % Smartsheet, Inc. Class A 2.6 % TransMedics Group, Inc. 2.6 % Merit Medical Systems, Inc. 2.5 % Mirion Technologies, Inc. 2.4 % PlayAGS, Inc. 2.3 % Stoneridge, Inc. 2.3 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings Cargurus, Inc. 2.9 % RB Global, Inc. (Canada) 2.9 % Turning Point Brands, Inc. 2.8 % ACV Auctions, Inc. Class A 2.7 % Smartsheet, Inc. Class A 2.6 % TransMedics Group, Inc. 2.6 % Merit Medical Systems, Inc. 2.5 % Mirion Technologies, Inc. 2.4 % PlayAGS, Inc. 2.3 % Stoneridge, Inc. 2.3 % |
| C000132296 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Meridian Small Cap Growth Fund |
| Class Name | Institutional Class |
| Trading Symbol | MSGRX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Meridian Small Cap Growth Fund (“Fund”) for the period of July 1, 2023 to June 30, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can also request this information by contacting us at 1-800-446-6662. This report describes changes to the Fund that occurred during the reporting period. You can find additional information about the Fund at www.arrowmarkpartners.com/meridian/ |
| Additional Information Phone Number | 1-800-446-6662 |
| Additional Information Website | www.arrowmarkpartners.com/meridian/ |
| Expenses [Text Block] | What were the Fund expenses for the last year? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage Meridian Small Cap Growth Fund $ 1.10 % |
| Expenses Paid, Amount | $ 112 |
| Expense Ratio, Percent | 1.10% |
| Factors Affecting Performance [Text Block] | What drove fund performance during the past 12 months U.S. equities moved higher over the 12-month period ended June 30, 2024. In our view, resilient economic growth, a strong labor market, higher corporate earnings, and easing inflation gave investors the support they needed to look past higher interest rates and bid stocks higher. Small cap stocks, while delivering a respectable 10% index return over the period, were generally overshadowed by the market’s narrow focus on larger, AI-related companies. The investment strategy’s emphasis on downside protection proved effective during the period, as the strategy outperformed on nine of the ten days on which the index declined 2% or more. Our investment process focuses on what we believe are high-quality companies with recurring revenue and sustainable competitive advantages, which we are currently finding lower on the [small] capitalization spectrum. This process contrasted with the market’s appetite for larger, high-momentum companies during the period. From a sector perspective, stock selection was positive in the healthcare and consumer discretionary sectors. Conversely, an underweight position and negative stock selection in the information technology sector detracted from relative returns, as the information technology sector was one of the better-performing sectors of the market during the period. |
| Performance Past Does Not Indicate Future [Text] | Past performance is not predictive of future performance. |
| Line Graph [Table Text Block] | How has the Fund historically performed? This chart assumes an initial investment of $1,000,000 made on December 24, 2014 for Institutional Class including any applicable sales charges or fees. The performance of the other share class may be greater or less than that shown based on differences in inception dates, fees, and sales charges. Performance assumes reinvestment of dividends and capital gain distributions. GROWTH OF $1,000,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years Since Inception (1) Meridian Small Cap Growth Fund (Institutional Class/(MSGRX)) 4.45 % 5.62 % 0.00 % 7.72 % Russell 2000 ® 9.14 % 6.17 % 7.39 % 7.66 % Russell 3000 ® 23.13 % 14.14 % 12.15 % 12.58 % (1) Inception date of Institutional Class is 12/24/14 |
| Performance Inception Date | Dec. 24, 2014 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares |
| Updated Performance Information Location [Text Block] | To obtain a prospectus, please contact your investment representative or the Funds' transfer agent at 1-800-446-6662 or access our website at www.arrowmarkpartners.com/meridian |
| Net Assets | $ 441,206,126 |
| Holdings Count | Holding | 106 |
| Advisory Fees Paid, Amount | $ 5,479,951 |
| Investment Company Portfolio Turnover | 42% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fee paid $ % Portfolio turnover rate as of the end of the reporting period $ % |
| Holdings [Text Block] | Top Ten Holdings Cargurus, Inc. 2.9 % RB Global, Inc. (Canada) 2.9 % Turning Point Brands, Inc. 2.8 % ACV Auctions, Inc. Class A 2.7 % Smartsheet, Inc. Class A 2.6 % TransMedics Group, Inc. 2.6 % Merit Medical Systems, Inc. 2.5 % Mirion Technologies, Inc. 2.4 % PlayAGS, Inc. 2.3 % Stoneridge, Inc. 2.3 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings Cargurus, Inc. 2.9 % RB Global, Inc. (Canada) 2.9 % Turning Point Brands, Inc. 2.8 % ACV Auctions, Inc. Class A 2.7 % Smartsheet, Inc. Class A 2.6 % TransMedics Group, Inc. 2.6 % Merit Medical Systems, Inc. 2.5 % Mirion Technologies, Inc. 2.4 % PlayAGS, Inc. 2.3 % Stoneridge, Inc. 2.3 % |
| C000132295 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Meridian Small Cap Growth Fund |
| Class Name | Class A |
| Trading Symbol | MSGAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Meridian Small Cap Growth Fund (“Fund”) for the period of July 1, 2023 to June 30, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can also request this information by contacting us at 1-800-446-6662. This report describes changes to the Fund that occurred during the reporting period. You can find additional information about the Fund at www.arrowmarkpartners.com/meridian/ |
| Additional Information Phone Number | 1-800-446-6662 |
| Additional Information Website | www.arrowmarkpartners.com/meridian/ |
| Expenses [Text Block] | What were the Fund expenses for the last year? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage Meridian Small Cap Growth Fund $ 1.54 % |
| Expenses Paid, Amount | $ 157 |
| Expense Ratio, Percent | 1.54% |
| Factors Affecting Performance [Text Block] | What drove fund performance during the past 12 months U.S. equities moved higher over the 12-month period ended June 30, 2024. In our view, resilient economic growth, a strong labor market, higher corporate earnings, and easing inflation gave investors the support they needed to look past higher interest rates and bid stocks higher. Small cap stocks, while delivering a respectable 10% index return over the period, were generally overshadowed by the market’s narrow focus on larger, AI-related companies. The investment strategy’s emphasis on downside protection proved effective during the period, as the strategy outperformed on nine of the ten days on which the index declined 2% or more. Our investment process focuses on what we believe are high-quality companies with recurring revenue and sustainable competitive advantages, which we are currently finding lower on the [small] capitalization spectrum. This process contrasted with the market’s appetite for larger, high-momentum companies during the period. From a sector perspective, stock selection was positive in the healthcare and consumer discretionary sectors. Conversely, an underweight position and negative stock selection in the information technology sector detracted from relative returns, as the information technology sector was one of the better-performing sectors of the market during the period. |
| Performance Past Does Not Indicate Future [Text] | Past performance is not predictive of future performance. |
| Line Graph [Table Text Block] | How has the Fund historically performed? This chart assumes an initial investment of $10,000 made on July 1, 2014 for Class A including any applicable sales charges or fees. The performance of the other share class may be greater or less than that shown based on differences in inception dates, fees, and sales charges. Performance assumes reinvestment of dividends and capital gain distributions. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years Since Inception (1) Meridian Small Cap Growth Fund (Class A/(MSGAX)) 4.04 ) % 5.18 % 7.69 % 8.83 % Meridian Small Cap Growth Fund (Class A/(MSGAX)) (2) (1.91 ) % 3.95 % 7.05 % 8.22 % Russell 2000 ® 9.14 ) % 6.17 % 7.39 % 7.66 % Russell 3000 ® 23.13 ) % 14.14 % 12.15 % 12.58 % (1) Inception date of Class A is 12/16/13 (2) Assuming maximum sales charge, if any. Class A Shares are subject to a maximum initial sales charge of 5.75% |
| Performance Inception Date | Dec. 16, 2013 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares |
| Updated Performance Information Location [Text Block] | To obtain a prospectus, please contact your investment representative or the Funds' transfer agent at 1-800-446-6662 or access our website at www.arrowmarkpartners.com/meridian |
| Net Assets | $ 441,206,126 |
| Holdings Count | Holding | 106 |
| Advisory Fees Paid, Amount | $ 5,479,951 |
| Investment Company Portfolio Turnover | 42% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fee paid $ % Portfolio turnover rate as of the end of the reporting period $ % |
| Holdings [Text Block] | Top Ten Holdings Cargurus, Inc. 2.9 % RB Global, Inc. (Canada) 2.9 % Turning Point Brands, Inc. 2.8 % ACV Auctions, Inc. Class A 2.7 % Smartsheet, Inc. Class A 2.6 % TransMedics Group, Inc. 2.6 % Merit Medical Systems, Inc. 2.5 % Mirion Technologies, Inc. 2.4 % PlayAGS, Inc. 2.3 % Stoneridge, Inc. 2.3 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings Cargurus, Inc. 2.9 % RB Global, Inc. (Canada) 2.9 % Turning Point Brands, Inc. 2.8 % ACV Auctions, Inc. Class A 2.7 % Smartsheet, Inc. Class A 2.6 % TransMedics Group, Inc. 2.6 % Merit Medical Systems, Inc. 2.5 % Mirion Technologies, Inc. 2.4 % PlayAGS, Inc. 2.3 % Stoneridge, Inc. 2.3 % |
| C000156530 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Meridian Small Cap Growth Fund |
| Class Name | Class C |
| Trading Symbol | MSGCX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Meridian Small Cap Growth Fund (“Fund”) for the period of July 1, 2023 to June 30, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can also request this information by contacting us at 1-800-446-6662. This report describes changes to the Fund that occurred during the reporting period. You can find additional information about the Fund at www.arrowmarkpartners.com/meridian/ |
| Additional Information Phone Number | 1-800-446-6662 |
| Additional Information Website | www.arrowmarkpartners.com/meridian/ |
| Expenses [Text Block] | What were the Fund expenses for the last year? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage Meridian Small Cap Growth Fund $ 2.25 % |
| Expenses Paid, Amount | $ 229 |
| Expense Ratio, Percent | 2.25% |
| Factors Affecting Performance [Text Block] | What drove fund performance during the past 12 months U.S. equities moved higher over the 12-month period ended June 30, 2024. In our view, resilient economic growth, a strong labor market, higher corporate earnings, and easing inflation gave investors the support they needed to look past higher interest rates and bid stocks higher. Small cap stocks, while delivering a respectable 10% index return over the period, were generally overshadowed by the market’s narrow focus on larger, AI-related companies. The investment strategy’s emphasis on downside protection proved effective during the period, as the strategy outperformed on nine of the ten days on which the index declined 2% or more. Our investment process focuses on what we believe are high-quality companies with recurring revenue and sustainable competitive advantages, which we are currently finding lower on the [small] capitalization spectrum. This process contrasted with the market’s appetite for larger, high-momentum companies during the period. From a sector perspective, stock selection was positive in the healthcare and consumer discretionary sectors. Conversely, an underweight position and negative stock selection in the information technology sector detracted from relative returns, as the information technology sector was one of the better-performing sectors of the market during the period. |
| Performance Past Does Not Indicate Future [Text] | Past performance is not predictive of future performance. |
| Line Graph [Table Text Block] | How has the Fund historically performed? This chart assumes an initial investment of $10,000 made on July 1, 2015 for Class C including any applicable sales charges or fees. The performance of the other share class may be greater or less than that shown based on differences in inception dates, fees, and sales charges. Performance assumes reinvestment of dividends and capital gain distributions. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years Since Inception (1) Meridian Small Cap Growth Fund (Class C/(MSGCX)) 3.35 % 4.45 % 0.00 % 6.29 % Russell 2000 ® 9.14 % 6.17 % 7.39 % 7.66 % Russell 3000 ® 23.13 % 14.14 % 12.15 % 12.58 % (1) Inception date of Class C is 07/01/15 |
| Performance Inception Date | Jul. 01, 2015 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. |
| Updated Performance Information Location [Text Block] | To obtain a prospectus, please contact your investment representative or the Funds' transfer agent at 1-800-446-6662 or access our website at www.arrowmarkpartners.com/meridian |
| Net Assets | $ 441,206,126 |
| Holdings Count | Holding | 106 |
| Advisory Fees Paid, Amount | $ 5,479,951 |
| Investment Company Portfolio Turnover | 42% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fee paid $ % Portfolio turnover rate as of the end of the reporting period $ % |
| Holdings [Text Block] | Top Ten Holdings Cargurus, Inc. 2.9 % RB Global, Inc. (Canada) 2.9 % Turning Point Brands, Inc. 2.8 % ACV Auctions, Inc. Class A 2.7 % Smartsheet, Inc. Class A 2.6 % TransMedics Group, Inc. 2.6 % Merit Medical Systems, Inc. 2.5 % Mirion Technologies, Inc. 2.4 % PlayAGS, Inc. 2.3 % Stoneridge, Inc. 2.3 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings Cargurus, Inc. 2.9 % RB Global, Inc. (Canada) 2.9 % Turning Point Brands, Inc. 2.8 % ACV Auctions, Inc. Class A 2.7 % Smartsheet, Inc. Class A 2.6 % TransMedics Group, Inc. 2.6 % Merit Medical Systems, Inc. 2.5 % Mirion Technologies, Inc. 2.4 % PlayAGS, Inc. 2.3 % Stoneridge, Inc. 2.3 % |
| C000132294 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Meridian Small Cap Growth Fund |
| Class Name | Investor Class |
| Trading Symbol | MISGX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Meridian Small Cap Growth Fund (“Fund”) for the period of July 1, 2023 to June 30, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can also request this information by contacting us at 1-800-446-6662. This report describes changes to the Fund that occurred during the reporting period. You can find additional information about the Fund at www.arrowmarkpartners.com/meridian/ |
| Additional Information Phone Number | 1-800-446-6662 |
| Additional Information Website | www.arrowmarkpartners.com/meridian/ |
| Expenses [Text Block] | What were the Fund expenses for the last year? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage Meridian Small Cap Growth Fund $ 1.27 % |
| Expenses Paid, Amount | $ 130 |
| Expense Ratio, Percent | 1.27% |
| Factors Affecting Performance [Text Block] | What drove fund performance during the past 12 months U.S. equities moved higher over the 12-month period ended June 30, 2024. In our view, resilient economic growth, a strong labor market, higher corporate earnings, and easing inflation gave investors the support they needed to look past higher interest rates and bid stocks higher. Small cap stocks, while delivering a respectable 10% index return over the period, were generally overshadowed by the market’s narrow focus on larger, AI-related companies. The investment strategy’s emphasis on downside protection proved effective during the period, as the strategy outperformed on nine of the ten days on which the index declined 2% or more. Our investment process focuses on what we believe are high-quality companies with recurring revenue and sustainable competitive advantages, which we are currently finding lower on the [small] capitalization spectrum. This process contrasted with the market’s appetite for larger, high-momentum companies during the period. From a sector perspective, stock selection was positive in the healthcare and consumer discretionary sectors. Conversely, an underweight position and negative stock selection in the information technology sector detracted from relative returns, as the information technology sector was one of the better-performing sectors of the market during the period. |
| Performance Past Does Not Indicate Future [Text] | Past performance is not predictive of future performance. |
| Line Graph [Table Text Block] | How has the Fund historically performed? This chart assumes an initial investment of $10,000 made on July 1, 2014 for Investor Class including any applicable sales charges or fees. The performance of the other share class may be greater or less than that shown based on differences in inception dates, fees, and sales charges. Performance assumes reinvestment of dividends and capital gain distributions. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years Since Inception (1) Meridian Small Cap Growth Fund (Investor Class/(MISGX)) 4.29 % 5.46 % 7.97 % 9.12 % Russell 2000 ® 9.14 % 6.17 % 7.39 % 7.66 % Russell 3000 ® 23.13 % 14.14 % 12.15 % 12.58 % (1) Inception date of Investor Class is 12/16/13 |
| Performance Inception Date | Dec. 16, 2013 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares |
| Updated Performance Information Location [Text Block] | To obtain a prospectus, please contact your investment representative or the Funds' transfer agent at 1-800-446-6662 or access our website at www.arrowmarkpartners.com/meridian |
| Net Assets | $ 441,206,126 |
| Holdings Count | Holding | 106 |
| Advisory Fees Paid, Amount | $ 5,479,951 |
| Investment Company Portfolio Turnover | 42% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fee paid $ % Portfolio turnover rate as of the end of the reporting period $ % |
| Holdings [Text Block] | Top Ten Holdings Cargurus, Inc. 2.9 % RB Global, Inc. (Canada) 2.9 % Turning Point Brands, Inc. 2.8 % ACV Auctions, Inc. Class A 2.7 % Smartsheet, Inc. Class A 2.6 % TransMedics Group, Inc. 2.6 % Merit Medical Systems, Inc. 2.5 % Mirion Technologies, Inc. 2.4 % PlayAGS, Inc. 2.3 % Stoneridge, Inc. 2.3 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings Cargurus, Inc. 2.9 % RB Global, Inc. (Canada) 2.9 % Turning Point Brands, Inc. 2.8 % ACV Auctions, Inc. Class A 2.7 % Smartsheet, Inc. Class A 2.6 % TransMedics Group, Inc. 2.6 % Merit Medical Systems, Inc. 2.5 % Mirion Technologies, Inc. 2.4 % PlayAGS, Inc. 2.3 % Stoneridge, Inc. 2.3 % |
| C000003882 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Meridian Growth Fund |
| Class Name | Legacy Class |
| Trading Symbol | MERDX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Meridian Growth Fund (“Fund”) for the period of July 1, 2023 to June 30, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can also request this information by contacting us at 1-800-446-6662. This report describes changes to the Fund that occurred during the reporting period. You can find additional information about the Fund at www.arrowmarkpartners.com/meridian/ |
| Additional Information Phone Number | 1-800-446-6662 |
| Additional Information Website | www.arrowmarkpartners.com/meridian/ |
| Expenses [Text Block] | What were the Fund expenses for the last year? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage Meridian Growth Fund $ 0.90 % |
| Expenses Paid, Amount | $ 90 |
| Expense Ratio, Percent | 0.90% |
| Factors Affecting Performance [Text Block] | What drove fund performance during the past 12 months U.S. equities moved higher over the 12-month period ended June 30, 2024. In our view, resilient economic growth, a strong labor market, higher corporate earnings, and easing inflation gave investors the support they needed to look past higher interest rates and bid stocks higher. Small cap stocks, while delivering a respectable 10% index return over the period, were generally overshadowed by the market’s narrow focus on larger, AI-related companies. The investment strategy’s emphasis on downside protection proved effective during the period, as the strategy outperformed on eight of the nine days on which the index declined 2% or more. Our investment process focuses on what we believe are high-quality companies with recurring revenue and sustainable competitive advantages. The market presented a challenging landscape for our approach as high-momentum stocks outperformed [other investment strategies], creating a headwind to performance since the fund does not focus on those stocks. From a sector perspective, positive stock selection in the industrials and healthcare sectors aided returns. Conversely, negative stock selection in the consumer discretionary and communication services sectors were headwinds to relative performance. |
| Performance Past Does Not Indicate Future [Text] | Past performance is not predictive of future performance. |
| Line Graph [Table Text Block] | How has the Fund historically performed? This chart assumes an initial investment of $10,000 made on July 1, 2014 for Legacy Class including any applicable sales charges or fees. The performance of the other share class may be greater or less than that shown based on differences in inception dates, fees, and sales charges. Performance assumes reinvestment of dividends and capital gain distributions. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years Since Inception (1) Meridian Growth Fund (Legacy Class/(MERDX)) 0.44 % 4.64 % 7.61 % 11.46 % Russell 2500 ® 9.02 % 7.58 % 8.77 % N/A (2) Russell 3000 ® 23.13 % 14.14 % 12.15 % 11.67 % (1) Inception date of Legacy Class is 08/01/84 (2) Inception date of Legacy Class precedes the inception date of the Russell 2500 ® |
| Performance Inception Date | Aug. 01, 1984 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares |
| Updated Performance Information Location [Text Block] | To obtain a prospectus, please contact your investment representative or the Funds' transfer agent at 1-800-446-6662 or access our website at www.arrowmarkpartners.com/meridian |
| Net Assets | $ 1,147,064,640 |
| Holdings Count | Holding | 89 |
| Advisory Fees Paid, Amount | $ 9,757,215 |
| Investment Company Portfolio Turnover | 33% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fee paid $ % Portfolio turnover rate as of the end of the reporting period $ % |
| Holdings [Text Block] | Top Ten Holdings RB Global, Inc. (Canada) 3.8 % Trimble, Inc. 3.3 % Ziff Davis, Inc. 3.1 % Churchill Downs, Inc. 3.0 % Cargurus, Inc. 3.0 % Sensata Technologies Holding Plc 2.9 % Euronet Worldwide, Inc. 2.8 % ACV Auctions, Inc. Class A 2.8 % STERIS Plc 2.8 % Smartsheet, Inc. Class A 2.7 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings RB Global, Inc. (Canada) 3.8 % Trimble, Inc. 3.3 % Ziff Davis, Inc. 3.1 % Churchill Downs, Inc. 3.0 % Cargurus, Inc. 3.0 % Sensata Technologies Holding Plc 2.9 % Euronet Worldwide, Inc. 2.8 % ACV Auctions, Inc. Class A 2.8 % STERIS Plc 2.8 % Smartsheet, Inc. Class A 2.7 % |
| C000132941 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Meridian Growth Fund |
| Class Name | Institutional Class |
| Trading Symbol | MRRGX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Meridian Growth Fund (“Fund”) for the period of July 1, 2023 to June 30, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can also request this information by contacting us at 1-800-446-6662. This report describes changes to the Fund that occurred during the reporting period. You can find additional information about the Fund at www.arrowmarkpartners.com/meridian/ |
| Additional Information Phone Number | 1-800-446-6662 |
| Additional Information Website | www.arrowmarkpartners.com/meridian/ |
| Expenses [Text Block] | What were the Fund expenses for the last year? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage Meridian Growth Fund $ 0.87 % |
| Expenses Paid, Amount | $ 87 |
| Expense Ratio, Percent | 0.87% |
| Factors Affecting Performance [Text Block] | What drove fund performance during the past 12 months U.S. equities moved higher over the 12-month period ended June 30, 2024. In our view, resilient economic growth, a strong labor market, higher corporate earnings, and easing inflation gave investors the support they needed to look past higher interest rates and bid stocks higher. Small cap stocks, while delivering a respectable 10% index return over the period, were generally overshadowed by the market’s narrow focus on larger, AI-related companies. The investment strategy’s emphasis on downside protection proved effective during the period, as the strategy outperformed on eight of the nine days on which the index declined 2% or more. Our investment process focuses on what we believe are high-quality companies with recurring revenue and sustainable competitive advantages. The market presented a challenging landscape for our approach as high-momentum stocks outperformed [other investment strategies], creating a headwind to performance since the fund does not focus on those stocks. From a sector perspective, positive stock selection in the industrials and healthcare sectors aided returns. Conversely, negative stock selection in the consumer discretionary and communication services sectors were headwinds to relative performance. |
| Performance Past Does Not Indicate Future [Text] | Past performance is not predictive of future performance. |
| Line Graph [Table Text Block] | How has the Fund historically performed? This chart assumes an initial investment of $1,000,000 made on December 24, 2014 for Institutional Class including any applicable sales charges or fees. The performance of the other share class may be greater or less than that shown based on differences in inception dates, fees, and sales charges. Performance assumes reinvestment of dividends and capital gain distributions. GROWTH OF $1,000,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years Since Inception (1) Meridian Growth Fund (Institutional Class/(MRRGX)) 0.47 % 4.68 % 0.00 % 7.17 % Russell 2500 ® 9.02 % 7.58 % 8.77 % N/A (2) Russell 3000 ® 23.13 % 14.14 % 12.15 % 11.67 % (1) Inception date of Institutional Class is 12/24/14 (2) Inception date of Institutional Class precedes the inception date of the Russell 2500 ® |
| Performance Inception Date | Dec. 24, 2014 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares |
| Updated Performance Information Location [Text Block] | To obtain a prospectus, please contact your investment representative or the Funds' transfer agent at 1-800-446-6662 or access our website at www.arrowmarkpartners.com/meridian |
| Net Assets | $ 1,147,064,640 |
| Holdings Count | Holding | 89 |
| Advisory Fees Paid, Amount | $ 9,757,215 |
| Investment Company Portfolio Turnover | 33% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fee paid $ % Portfolio turnover rate as of the end of the reporting period $ % |
| Holdings [Text Block] | Top Ten Holdings RB Global, Inc. (Canada) 3.8 % Trimble, Inc. 3.3 % Ziff Davis, Inc. 3.1 % Churchill Downs, Inc. 3.0 % Cargurus, Inc. 3.0 % Sensata Technologies Holding Plc 2.9 % Euronet Worldwide, Inc. 2.8 % ACV Auctions, Inc. Class A 2.8 % STERIS Plc 2.8 % Smartsheet, Inc. Class A 2.7 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings RB Global, Inc. (Canada) 3.8 % Trimble, Inc. 3.3 % Ziff Davis, Inc. 3.1 % Churchill Downs, Inc. 3.0 % Cargurus, Inc. 3.0 % Sensata Technologies Holding Plc 2.9 % Euronet Worldwide, Inc. 2.8 % ACV Auctions, Inc. Class A 2.8 % STERIS Plc 2.8 % Smartsheet, Inc. Class A 2.7 % |
| C000132940 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Meridian Growth Fund |
| Class Name | Class A |
| Trading Symbol | MRAGX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Meridian Growth Fund (“Fund”) for the period of July 1, 2023 to June 30, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can also request this information by contacting us at 1-800-446-6662. This report describes changes to the Fund that occurred during the reporting period. You can find additional information about the Fund at www.arrowmarkpartners.com/meridian/ |
| Additional Information Phone Number | 1-800-446-6662 |
| Additional Information Website | www.arrowmarkpartners.com/meridian/ |
| Expenses [Text Block] | What were the Fund expenses for the last year? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage Meridian Growth Fund $ 1.07 % |
| Expenses Paid, Amount | $ 107 |
| Expense Ratio, Percent | 1.07% |
| Factors Affecting Performance [Text Block] | What drove fund performance during the past 12 months U.S. equities moved higher over the 12-month period ended June 30, 2024. In our view, resilient economic growth, a strong labor market, higher corporate earnings, and easing inflation gave investors the support they needed to look past higher interest rates and bid stocks higher. Small cap stocks, while delivering a respectable 10% index return over the period, were generally overshadowed by the market’s narrow focus on larger, AI-related companies. The investment strategy’s emphasis on downside protection proved effective during the period, as the strategy outperformed on eight of the nine days on which the index declined 2% or more. Our investment process focuses on what we believe are high-quality companies with recurring revenue and sustainable competitive advantages. The market presented a challenging landscape for our approach as high-momentum stocks outperformed [other investment strategies], creating a headwind to performance since the fund does not focus on those stocks. From a sector perspective, positive stock selection in the industrials and healthcare sectors aided returns. Conversely, negative stock selection in the consumer discretionary and communication services sectors were headwinds to relative performance. |
| Performance Past Does Not Indicate Future [Text] | Past performance is not predictive of future performance. |
| Line Graph [Table Text Block] | How has the Fund historically performed? This chart assumes an initial investment of $10,000 made on July 1, 2014 for Class A including any applicable sales charges or fees. The performance of the other share class may be greater or less than that shown based on differences in inception dates, fees, and sales charges. Performance assumes reinvestment of dividends and capital gain distributions. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years Since Inception (1) Meridian Growth Fund (Class A/(MRAGX)) 0.25 ) % 4.34 % 7.22 % 7.35 % Meridian Growth Fund (Class A/(MRAGX)) (2) (5.64 ) % 3.11 % 6.59 % 6.75 % Russell 2500 ® 9.02 ) % 7.58 % 8.77 % N/A (3) Russell 3000 ® 23.13 ) % 14.14 % 12.15 % 11.67 % (1) Inception date of Class A is 11/15/13 (2) Assuming maximum sales charge, if any. Class A Shares are subject to a maximum initial sales charge of 5.75% (3) Inception date of Class A precedes the inception date of the Russell 2500 ® |
| Performance Inception Date | Nov. 15, 2013 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares |
| Updated Performance Information Location [Text Block] | To obtain a prospectus, please contact your investment representative or the Funds' transfer agent at 1-800-446-6662 or access our website at www.arrowmarkpartners.com/meridian |
| Net Assets | $ 1,147,064,640 |
| Holdings Count | Holding | 89 |
| Advisory Fees Paid, Amount | $ 9,757,215 |
| Investment Company Portfolio Turnover | 33% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fee paid $ % Portfolio turnover rate as of the end of the reporting period $ % |
| Holdings [Text Block] | Top Ten Holdings RB Global, Inc. (Canada) 3.8 % Trimble, Inc. 3.3 % Ziff Davis, Inc. 3.1 % Churchill Downs, Inc. 3.0 % Cargurus, Inc. 3.0 % Sensata Technologies Holding Plc 2.9 % Euronet Worldwide, Inc. 2.8 % ACV Auctions, Inc. Class A 2.8 % STERIS Plc 2.8 % Smartsheet, Inc. Class A 2.7 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings RB Global, Inc. (Canada) 3.8 % Trimble, Inc. 3.3 % Ziff Davis, Inc. 3.1 % Churchill Downs, Inc. 3.0 % Cargurus, Inc. 3.0 % Sensata Technologies Holding Plc 2.9 % Euronet Worldwide, Inc. 2.8 % ACV Auctions, Inc. Class A 2.8 % STERIS Plc 2.8 % Smartsheet, Inc. Class A 2.7 % |
| C000156528 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Meridian Growth Fund |
| Class Name | Class C |
| Trading Symbol | MRCGX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Meridian Growth Fund (“Fund”) for the period of July 1, 2023 to June 30, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can also request this information by contacting us at 1-800-446-6662. This report describes changes to the Fund that occurred during the reporting period. You can find additional information about the Fund at www.arrowmarkpartners.com/meridian/ |
| Additional Information Phone Number | 1-800-446-6662 |
| Additional Information Website | www.arrowmarkpartners.com/meridian/ |
| Expenses [Text Block] | What were the Fund expenses for the last year? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage Meridian Growth Fund $ 1.78 % |
| Expenses Paid, Amount | $ 178 |
| Expense Ratio, Percent | 1.78% |
| Factors Affecting Performance [Text Block] | What drove fund performance during the past 12 months U.S. equities moved higher over the 12-month period ended June 30, 2024. In our view, resilient economic growth, a strong labor market, higher corporate earnings, and easing inflation gave investors the support they needed to look past higher interest rates and bid stocks higher. Small cap stocks, while delivering a respectable 10% index return over the period, were generally overshadowed by the market’s narrow focus on larger, AI-related companies. The investment strategy’s emphasis on downside protection proved effective during the period, as the strategy outperformed on eight of the nine days on which the index declined 2% or more. Our investment process focuses on what we believe are high-quality companies with recurring revenue and sustainable competitive advantages. The market presented a challenging landscape for our approach as high-momentum stocks outperformed [other investment strategies], creating a headwind to performance since the fund does not focus on those stocks. From a sector perspective, positive stock selection in the industrials and healthcare sectors aided returns. Conversely, negative stock selection in the consumer discretionary and communication services sectors were headwinds to relative performance. |
| Performance Past Does Not Indicate Future [Text] | Past performance is not predictive of future performance. |
| Line Graph [Table Text Block] | How has the Fund historically performed? This chart assumes an initial investment of $10,000 made on July 1, 2015 for Class C including any applicable sales charges or fees. The performance of the other share class may be greater or less than that shown based on differences in inception dates, fees, and sales charges. Performance assumes reinvestment of dividends and capital gain distributions. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years Since Inception (1) Meridian Growth Fund (Class C/(MRCGX)) (0.43 ) % 3.59 % 0.00 % 6.06 % Russell 2500 ® 9.02 ) % 7.58 % 8.77 % N/A (2) Russell 3000 ® 23.13 ) % 14.14 % 12.15 % 11.67 % (1) Inception date of Class C is 07/01/15 (2) Inception date of Class C precedes the inception date of the Russell 2500 ® |
| Performance Inception Date | Jul. 01, 2015 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. |
| Updated Performance Information Location [Text Block] | To obtain a prospectus, please contact your investment representative or the Funds' transfer agent at 1-800-446-6662 or access our website at www.arrowmarkpartners.com/meridian |
| Net Assets | $ 1,147,064,640 |
| Holdings Count | Holding | 89 |
| Advisory Fees Paid, Amount | $ 9,757,215 |
| Investment Company Portfolio Turnover | 33% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fee paid $ % Portfolio turnover rate as of the end of the reporting period $ % |
| Holdings [Text Block] | Top Ten Holdings RB Global, Inc. (Canada) 3.8 % Trimble, Inc. 3.3 % Ziff Davis, Inc. 3.1 % Churchill Downs, Inc. 3.0 % Cargurus, Inc. 3.0 % Sensata Technologies Holding Plc 2.9 % Euronet Worldwide, Inc. 2.8 % ACV Auctions, Inc. Class A 2.8 % STERIS Plc 2.8 % Smartsheet, Inc. Class A 2.7 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings RB Global, Inc. (Canada) 3.8 % Trimble, Inc. 3.3 % Ziff Davis, Inc. 3.1 % Churchill Downs, Inc. 3.0 % Cargurus, Inc. 3.0 % Sensata Technologies Holding Plc 2.9 % Euronet Worldwide, Inc. 2.8 % ACV Auctions, Inc. Class A 2.8 % STERIS Plc 2.8 % Smartsheet, Inc. Class A 2.7 % |
| C000132939 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Meridian Growth Fund |
| Class Name | Investor Class |
| Trading Symbol | MRIGX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Meridian Growth Fund (“Fund”) for the period of July 1, 2023 to June 30, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can also request this information by contacting us at 1-800-446-6662. This report describes changes to the Fund that occurred during the reporting period. You can find additional information about the Fund at www.arrowmarkpartners.com/meridian/ |
| Additional Information Phone Number | 1-800-446-6662 |
| Additional Information Website | www.arrowmarkpartners.com/meridian/ |
| Expenses [Text Block] | What were the Fund expenses for the last year? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage Meridian Growth Fund $ 0.96 % |
| Expenses Paid, Amount | $ 96 |
| Expense Ratio, Percent | 0.96% |
| Factors Affecting Performance [Text Block] | What drove fund performance during the past 12 months U.S. equities moved higher over the 12-month period ended June 30, 2024. In our view, resilient economic growth, a strong labor market, higher corporate earnings, and easing inflation gave investors the support they needed to look past higher interest rates and bid stocks higher. Small cap stocks, while delivering a respectable 10% index return over the period, were generally overshadowed by the market’s narrow focus on larger, AI-related companies. The investment strategy’s emphasis on downside protection proved effective during the period, as the strategy outperformed on eight of the nine days on which the index declined 2% or more. Our investment process focuses on what we believe are high-quality companies with recurring revenue and sustainable competitive advantages. The market presented a challenging landscape for our approach as high-momentum stocks outperformed [other investment strategies], creating a headwind to performance since the fund does not focus on those stocks. From a sector perspective, positive stock selection in the industrials and healthcare sectors aided returns. Conversely, negative stock selection in the consumer discretionary and communication services sectors were headwinds to relative performance. |
| Performance Past Does Not Indicate Future [Text] | Past performance is not predictive of future performance. |
| Line Graph [Table Text Block] | How has the Fund historically performed? This chart assumes an initial investment of $10,000 made on July 1, 2014 for Investor Class including any applicable sales charges or fees. The performance of the other share class may be greater or less than that shown based on differences in inception dates, fees, and sales charges. Performance assumes reinvestment of dividends and capital gain distributions. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years Since Inception (1) Meridian Growth Fund (Investor Class/(MRIGX)) 0.39 % 4.59 % 7.52 % 7.65 % Russell 2500 ® 9.02 % 7.58 % 8.77 % N/A (2) Russell 3000 ® 23.13 % 14.14 % 12.15 % 11.67 % (1) Inception date of Investor Class is 11/15/13 (2) Inception date of Investor Class precedes the inception date of the Russell 2500 ® |
| Performance Inception Date | Nov. 15, 2013 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares |
| Updated Performance Information Location [Text Block] | To obtain a prospectus, please contact your investment representative or the Funds' transfer agent at 1-800-446-6662 or access our website at www.arrowmarkpartners.com/meridian |
| Net Assets | $ 1,147,064,640 |
| Holdings Count | Holding | 89 |
| Advisory Fees Paid, Amount | $ 9,757,215 |
| Investment Company Portfolio Turnover | 33% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fee paid $ % Portfolio turnover rate as of the end of the reporting period $ % |
| Holdings [Text Block] | Top Ten Holdings RB Global, Inc. (Canada) 3.8 % Trimble, Inc. 3.3 % Ziff Davis, Inc. 3.1 % Churchill Downs, Inc. 3.0 % Cargurus, Inc. 3.0 % Sensata Technologies Holding Plc 2.9 % Euronet Worldwide, Inc. 2.8 % ACV Auctions, Inc. Class A 2.8 % STERIS Plc 2.8 % Smartsheet, Inc. Class A 2.7 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings RB Global, Inc. (Canada) 3.8 % Trimble, Inc. 3.3 % Ziff Davis, Inc. 3.1 % Churchill Downs, Inc. 3.0 % Cargurus, Inc. 3.0 % Sensata Technologies Holding Plc 2.9 % Euronet Worldwide, Inc. 2.8 % ACV Auctions, Inc. Class A 2.8 % STERIS Plc 2.8 % Smartsheet, Inc. Class A 2.7 % |
| C000003883 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Meridian Contrarian Fund |
| Class Name | Legacy Class |
| Trading Symbol | MVALX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Meridian Contrarian Fund (“Fund”) for the period of July 1, 2023 to June 30, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can also request this information by contacting us at 1-800-446-6662. This report describes changes to the Fund that occurred during the reporting period. You can find additional information about the Fund at www.arrowmarkpartners.com/meridian/ |
| Additional Information Phone Number | 1-800-446-6662 |
| Additional Information Website | www.arrowmarkpartners.com/meridian/ |
| Expenses [Text Block] | What were the Fund expenses for the last year? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage Meridian Contrarian Fund $ 1.17 % |
| Expenses Paid, Amount | $ 119 |
| Expense Ratio, Percent | 1.17% |
| Factors Affecting Performance [Text Block] | What drove fund performance during the past 12 months U.S. equities moved higher over the 12-month period ended June 30, 2024. In our view, resilient economic growth, a strong labor market, higher corporate earnings, and easing inflation gave investors the support they needed to look past higher interest rates and bid stocks higher. Small cap stocks, while delivering a respectable 10% index return over the period, were generally overshadowed by the market’s narrow focus on larger, AI-related companies. Experience has taught us that businesses with the potential for earnings growth and multiple expansion can be a powerful source of outperformance. As such, we employ a fundamental research-driven process that includes screening for companies that have multiple quarters of year-over-year earnings declines; exploring the reason for the declines; and singling out the companies we believe are poised for an earnings rebound via a cohesive turnaround plan, a new management team, or through improvements or changes to the business. From a sector perspective, positive stock selection in the communication services and consumer discretionary sectors aided returns. Conversely, negative stock selection in the information technology and healthcare sectors were headwinds to relative performance. |
| Performance Past Does Not Indicate Future [Text] | Past performance is not predictive of future performance. |
| Line Graph [Table Text Block] | How has the Fund historically performed? This chart assumes an initial investment of $10,000 made on July 1, 2014 for Legacy Class including any applicable sales charges or fees. The performance of the other share class may be greater or less than that shown based on differences in inception dates, fees, and sales charges. Performance assumes reinvestment of dividends and capital gain distributions. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years Since Inception (1) Meridian Contrarian Fund (Legacy Class/(MVALX)) 3.02 % 9.38 % 9.28 % 12.12 % Russell 2500 ® 10.47 % 8.31 % 7.99 % 9.83 % Russell 2500 ® 11.24 % 8.01 % 6.77 % N/A (2) Russell 3000 ® 23.13 % 14.14 % 12.15 % 10.34 % (1) Inception date of Legacy Class is 02/10/94 (2) Inception date of Legacy Class precedes the inception date of the Russell 2500 ® |
| Performance Inception Date | Feb. 10, 1994 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares |
| Updated Performance Information Location [Text Block] | To obtain a prospectus, please contact your investment representative or the Funds' transfer agent at 1-800-446-6662 or access our website at www.arrowmarkpartners.com/meridian |
| Net Assets | $ 564,747,899 |
| Holdings Count | Holding | 75 |
| Advisory Fees Paid, Amount | $ 5,824,218 |
| Investment Company Portfolio Turnover | 58% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fee paid $ % Portfolio turnover rate as of the end of the reporting period $ % |
| Holdings [Text Block] | Top Ten Holdings First Citizens BancShares, Inc. Class A 3.7 % CACI International, Inc. Class A 3.6 % Brookfield Renewable Corp. Class A 3.2 % VICI Properties, Inc. 3.2 % Tenet Healthcare Corp. 3.0 % Axis Capital Holdings Ltd. 2.9 % SMART Global Holdings, Inc. 2.8 % Cameco Corp. (Canada) 2.6 % California Resources Corp. 2.6 % Perrigo Co. Plc 2.6 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings First Citizens BancShares, Inc. Class A 3.7 % CACI International, Inc. Class A 3.6 % Brookfield Renewable Corp. Class A 3.2 % VICI Properties, Inc. 3.2 % Tenet Healthcare Corp. 3.0 % Axis Capital Holdings Ltd. 2.9 % SMART Global Holdings, Inc. 2.8 % Cameco Corp. (Canada) 2.6 % California Resources Corp. 2.6 % Perrigo Co. Plc 2.6 % |
| C000132943 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Meridian Contrarian Fund |
| Class Name | Class A |
| Trading Symbol | MFCAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Meridian Contrarian Fund (“Fund”) for the period of July 1, 2023 to June 30, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can also request this information by contacting us at 1-800-446-6662. This report describes changes to the Fund that occurred during the reporting period. You can find additional information about the Fund at www.arrowmarkpartners.com/meridian/ |
| Additional Information Phone Number | 1-800-446-6662 |
| Additional Information Website | www.arrowmarkpartners.com/meridian/ |
| Expenses [Text Block] | What were the Fund expenses for the last year? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage Meridian Contrarian Fund $ 1.44 % |
| Expenses Paid, Amount | $ 146 |
| Expense Ratio, Percent | 1.44% |
| Factors Affecting Performance [Text Block] | What drove fund performance during the past 12 months U.S. equities moved higher over the 12-month period ended June 30, 2024. In our view, resilient economic growth, a strong labor market, higher corporate earnings, and easing inflation gave investors the support they needed to look past higher interest rates and bid stocks higher. Small cap stocks, while delivering a respectable 10% index return over the period, were generally overshadowed by the market’s narrow focus on larger, AI-related companies. Experience has taught us that businesses with the potential for earnings growth and multiple expansion can be a powerful source of outperformance. As such, we employ a fundamental research-driven process that includes screening for companies that have multiple quarters of year-over-year earnings declines; exploring the reason for the declines; and singling out the companies we believe are poised for an earnings rebound via a cohesive turnaround plan, a new management team, or through improvements or changes to the business. From a sector perspective, positive stock selection in the communication services and consumer discretionary sectors aided returns. Conversely, negative stock selection in the information technology and healthcare sectors were headwinds to relative performance. |
| Performance Past Does Not Indicate Future [Text] | Past performance is not predictive of future performance. |
| Line Graph [Table Text Block] | How has the Fund historically performed? This chart assumes an initial investment of $10,000 made on July 1, 2014 for Class A including any applicable sales charges or fees. The performance of the other share class may be greater or less than that shown based on differences in inception dates, fees, and sales charges. Performance assumes reinvestment of dividends and capital gain distributions. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years Since Inception (1) Meridian Contrarian Fund (Class A/(MFCAX)) 2.74 ) % 9.05 % 8.87 % 9.02 % Meridian Contrarian Fund (Class A/(MFCAX)) (2) (3.16 ) % 7.77 % 8.23 % 8.41 % Russell 2500 ® 10.47 ) % 8.31 % 7.99 % 9.83 % Russell 2500 ® 11.24 ) % 8.01 % 6.77 % N/A (3) Russell 3000 ® 23.13 ) % 14.14 % 12.15 % 10.34 % (1) Inception date of Class A is 11/15/13 (2) Assuming maximum sales charge, if any. Class A Shares are subject to a maximum initial sales charge of 5.75% (3) Inception date of Class A precedes the inception date of the Russell 2500 ® |
| Performance Inception Date | Nov. 15, 2013 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares |
| Updated Performance Information Location [Text Block] | To obtain a prospectus, please contact your investment representative or the Funds' transfer agent at 1-800-446-6662 or access our website at www.arrowmarkpartners.com/meridian |
| Net Assets | $ 564,747,899 |
| Holdings Count | Holding | 75 |
| Advisory Fees Paid, Amount | $ 5,824,218 |
| Investment Company Portfolio Turnover | 58% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fee paid $ % Portfolio turnover rate as of the end of the reporting period $ % |
| Holdings [Text Block] | Top Ten Holdings First Citizens BancShares, Inc. Class A 3.7 % CACI International, Inc. Class A 3.6 % Brookfield Renewable Corp. Class A 3.2 % VICI Properties, Inc. 3.2 % Tenet Healthcare Corp. 3.0 % Axis Capital Holdings Ltd. 2.9 % SMART Global Holdings, Inc. 2.8 % Cameco Corp. (Canada) 2.6 % California Resources Corp. 2.6 % Perrigo Co. Plc 2.6 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings First Citizens BancShares, Inc. Class A 3.7 % CACI International, Inc. Class A 3.6 % Brookfield Renewable Corp. Class A 3.2 % VICI Properties, Inc. 3.2 % Tenet Healthcare Corp. 3.0 % Axis Capital Holdings Ltd. 2.9 % SMART Global Holdings, Inc. 2.8 % Cameco Corp. (Canada) 2.6 % California Resources Corp. 2.6 % Perrigo Co. Plc 2.6 % |
| C000156529 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Meridian Contrarian Fund |
| Class Name | Class C |
| Trading Symbol | MFCCX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Meridian Contrarian Fund (“Fund”) for the period of July 1, 2023 to June 30, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can also request this information by contacting us at 1-800-446-6662. This report describes changes to the Fund that occurred during the reporting period. You can find additional information about the Fund at www.arrowmarkpartners.com/meridian/ |
| Additional Information Phone Number | 1-800-446-6662 |
| Additional Information Website | www.arrowmarkpartners.com/meridian/ |
| Expenses [Text Block] | What were the Fund expenses for the last year? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage Meridian Contrarian Fund $ 2.23 % |
| Expenses Paid, Amount | $ 225 |
| Expense Ratio, Percent | 2.23% |
| Factors Affecting Performance [Text Block] | What drove fund performance during the past 12 months U.S. equities moved higher over the 12-month period ended June 30, 2024. In our view, resilient economic growth, a strong labor market, higher corporate earnings, and easing inflation gave investors the support they needed to look past higher interest rates and bid stocks higher. Small cap stocks, while delivering a respectable 10% index return over the period, were generally overshadowed by the market’s narrow focus on larger, AI-related companies. Experience has taught us that businesses with the potential for earnings growth and multiple expansion can be a powerful source of outperformance. As such, we employ a fundamental research-driven process that includes screening for companies that have multiple quarters of year-over-year earnings declines; exploring the reason for the declines; and singling out the companies we believe are poised for an earnings rebound via a cohesive turnaround plan, a new management team, or through improvements or changes to the business. From a sector perspective, positive stock selection in the communication services and consumer discretionary sectors aided returns. Conversely, negative stock selection in the information technology and healthcare sectors were headwinds to relative performance. |
| Performance Past Does Not Indicate Future [Text] | Past performance is not predictive of future performance. |
| Line Graph [Table Text Block] | How has the Fund historically performed? This chart assumes an initial investment of $10,000 made on July 1, 2015 for Class C including any applicable sales charges or fees. The performance of the other share class may be greater or less than that shown based on differences in inception dates, fees, and sales charges. Performance assumes reinvestment of dividends and capital gain distributions. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years Since Inception (1) Meridian Contrarian Fund (Class C/(MFCCX)) 1.93 % 8.25 % 0.00 % 8.41 % Russell 2500 ® 10.47 % 8.31 % 7.99 % 9.83 % Russell 2500 ® 11.24 % 8.01 % 6.77 % N/A (2) Russell 3000 ® 23.13 % 14.14 % 12.15 % 10.34 % (1) Inception date of Class C is 07/01/15 (2) Inception date of Class C precedes the inception date of the Russell 2500 ® |
| Performance Inception Date | Jul. 01, 2015 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. |
| Updated Performance Information Location [Text Block] | To obtain a prospectus, please contact your investment representative or the Funds' transfer agent at 1-800-446-6662 or access our website at www.arrowmarkpartners.com/meridian |
| Net Assets | $ 564,747,899 |
| Holdings Count | Holding | 75 |
| Advisory Fees Paid, Amount | $ 5,824,218 |
| Investment Company Portfolio Turnover | 58% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fee paid $ % Portfolio turnover rate as of the end of the reporting period $ % |
| Holdings [Text Block] | Top Ten Holdings First Citizens BancShares, Inc. Class A 3.7 % CACI International, Inc. Class A 3.6 % Brookfield Renewable Corp. Class A 3.2 % VICI Properties, Inc. 3.2 % Tenet Healthcare Corp. 3.0 % Axis Capital Holdings Ltd. 2.9 % SMART Global Holdings, Inc. 2.8 % Cameco Corp. (Canada) 2.6 % California Resources Corp. 2.6 % Perrigo Co. Plc 2.6 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings First Citizens BancShares, Inc. Class A 3.7 % CACI International, Inc. Class A 3.6 % Brookfield Renewable Corp. Class A 3.2 % VICI Properties, Inc. 3.2 % Tenet Healthcare Corp. 3.0 % Axis Capital Holdings Ltd. 2.9 % SMART Global Holdings, Inc. 2.8 % Cameco Corp. (Canada) 2.6 % California Resources Corp. 2.6 % Perrigo Co. Plc 2.6 % |
| C000132942 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Meridian Contrarian Fund |
| Class Name | Investor Class |
| Trading Symbol | MFCIX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Meridian Contrarian Fund (“Fund”) for the period of July 1, 2023 to June 30, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can also request this information by contacting us at 1-800-446-6662. This report describes changes to the Fund that occurred during the reporting period. You can find additional information about the Fund at www.arrowmarkpartners.com/meridian/ |
| Additional Information Phone Number | 1-800-446-6662 |
| Additional Information Website | www.arrowmarkpartners.com/meridian/ |
| Expenses [Text Block] | What were the Fund expenses for the last year? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage Meridian Contrarian Fund $ 1.20 % |
| Expenses Paid, Amount | $ 122 |
| Expense Ratio, Percent | 1.20% |
| Factors Affecting Performance [Text Block] | What drove fund performance during the past 12 months U.S. equities moved higher over the 12-month period ended June 30, 2024. In our view, resilient economic growth, a strong labor market, higher corporate earnings, and easing inflation gave investors the support they needed to look past higher interest rates and bid stocks higher. Small cap stocks, while delivering a respectable 10% index return over the period, were generally overshadowed by the market’s narrow focus on larger, AI-related companies. Experience has taught us that businesses with the potential for earnings growth and multiple expansion can be a powerful source of outperformance. As such, we employ a fundamental research-driven process that includes screening for companies that have multiple quarters of year-over-year earnings declines; exploring the reason for the declines; and singling out the companies we believe are poised for an earnings rebound via a cohesive turnaround plan, a new management team, or through improvements or changes to the business. From a sector perspective, positive stock selection in the communication services and consumer discretionary sectors aided returns. Conversely, negative stock selection in the information technology and healthcare sectors were headwinds to relative performance. |
| Performance Past Does Not Indicate Future [Text] | Past performance is not predictive of future performance. |
| Line Graph [Table Text Block] | How has the Fund historically performed? This chart assumes an initial investment of $10,000 made on July 1, 2014 for Investor Class including any applicable sales charges or fees. The performance of the other share class may be greater or less than that shown based on differences in inception dates, fees, and sales charges. Performance assumes reinvestment of dividends and capital gain distributions. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years Since Inception (1) Meridian Contrarian Fund (Investor Class/(MFCIX)) 3.00 % 9.33 % 9.16 % 9.30 % Russell 2500 ® 10.47 % 8.31 % 7.99 % 9.83 % Russell 2500 ® 11.24 % 8.01 % 6.77 % N/A (2) Russell 3000 ® 23.13 % 14.14 % 12.15 % 10.34 % (1) Inception date of Investor Class is 11/15/13 (2) Inception date of Investor Class precedes the inception date of the Russell 2500 ® |
| Performance Inception Date | Nov. 15, 2013 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares |
| Updated Performance Information Location [Text Block] | To obtain a prospectus, please contact your investment representative or the Funds' transfer agent at 1-800-446-6662 or access our website at www.arrowmarkpartners.com/meridian |
| Net Assets | $ 564,747,899 |
| Holdings Count | Holding | 75 |
| Advisory Fees Paid, Amount | $ 5,824,218 |
| Investment Company Portfolio Turnover | 58% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fee paid $ % Portfolio turnover rate as of the end of the reporting period $ % |
| Holdings [Text Block] | Top Ten Holdings First Citizens BancShares, Inc. Class A 3.7 % CACI International, Inc. Class A 3.6 % Brookfield Renewable Corp. Class A 3.2 % VICI Properties, Inc. 3.2 % Tenet Healthcare Corp. 3.0 % Axis Capital Holdings Ltd. 2.9 % SMART Global Holdings, Inc. 2.8 % Cameco Corp. (Canada) 2.6 % California Resources Corp. 2.6 % Perrigo Co. Plc 2.6 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings First Citizens BancShares, Inc. Class A 3.7 % CACI International, Inc. Class A 3.6 % Brookfield Renewable Corp. Class A 3.2 % VICI Properties, Inc. 3.2 % Tenet Healthcare Corp. 3.0 % Axis Capital Holdings Ltd. 2.9 % SMART Global Holdings, Inc. 2.8 % Cameco Corp. (Canada) 2.6 % California Resources Corp. 2.6 % Perrigo Co. Plc 2.6 % |
| C000003881 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Meridian Hedged Equity Fund |
| Class Name | Legacy Class |
| Trading Symbol | MEIFX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Meridian Hedged Equity Fund (“Fund”) for the period of July 1, 2023 to June 30, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can also request this information by contacting us at 1-800-446-6662. This report describes changes to the Fund that occurred during the reporting period. You can find additional information about the Fund at www.arrowmarkpartners.com/meridian/ |
| Additional Information Phone Number | 1-800-446-6662 |
| Additional Information Website | www.arrowmarkpartners.com/meridian/ |
| Expenses [Text Block] | What were the Fund expenses for the last year? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage Meridian Hedged Equity Fund $ 1.25 % |
| Expenses Paid, Amount | $ 134 |
| Expense Ratio, Percent | 1.25% |
| Factors Affecting Performance [Text Block] | What drove fund performance during the past 12 months U.S. equities moved higher over the 12-month period ended June 30, 2024. In our view, resilient economic growth, a strong labor market, higher corporate earnings, and easing inflation gave investors the support they needed to look past higher interest rates and bid stocks higher. Large-cap growth companies’ index returned 33.5% while all large caps’ index returned 23.9%. At period end, approximately 40% of the portfolio was unhedged, with long-term capital growth the primary objective. The rest of the Fund is invested in companies with covered call options, a strategy that seeks to balance the capital growth potential of the underlying companies with downside protection provided by the income generated from writing options. The contracts we write are structured to allow our fundamental thesis to play out while the strategy gains valuable income and potential downside protection. Contributing positively to performance, were several names in the information technology sector. Conversely, select holdings in the consumer discretionary sector detracted from relative performance. |
| Performance Past Does Not Indicate Future [Text] | Past performance is not predictive of future performance. |
| Line Graph [Table Text Block] | How has the Fund historically performed? This chart assumes an initial investment of $10,000 made on July 1, 2014 for Legacy Class including any applicable sales charges or fees. The performance of the other share class may be greater or less than that shown based on differences in inception dates, fees, and sales charges. Performance assumes reinvestment of dividends and capital gain distributions. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years Since Inception (1) Meridian Hedged Equity Fund (Legacy Class/(MEIFX)) 14.37 % 11.21 % 12.09 % 9.84 % S&P 500 ® 24.56 % 15.05 % 12.86 % 10.36 % CBOE S&P 500 Buy Write Index 8.91 % 5.56 % 5.77 % 5.46 % (1) Inception date of Legacy Class is 01/31/05 |
| Performance Inception Date | Jan. 31, 2005 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares |
| Updated Performance Information Location [Text Block] | To obtain a prospectus, please contact your investment representative or the Funds' transfer agent at 1-800-446-6662 or access our website at www.arrowmarkpartners.com/meridian |
| Net Assets | $ 45,273,958 |
| Holdings Count | Holding | 113 |
| Advisory Fees Paid, Amount | $ 325,145 |
| Investment Company Portfolio Turnover | 33% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fee paid $ % Portfolio turnover rate as of the end of the reporting period $ % |
| Holdings [Text Block] | Top Ten Holdings NVIDIA Corp. 7.8 % QUALCOMM, Inc. 5.4 % D.R. Horton, Inc. 4.2 % Live Nation Entertainment, Inc. 4.0 % Sally Beauty Holdings, Inc. 4.0 % Clear Secure, Inc. Class A 4.0 % MGM Resorts International 3.8 % Alibaba Group Holding Ltd. (China) 3.6 % Illumina, Inc. 3.5 % Charles Schwab Corp. (The) 3.2 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings NVIDIA Corp. 7.8 % QUALCOMM, Inc. 5.4 % D.R. Horton, Inc. 4.2 % Live Nation Entertainment, Inc. 4.0 % Sally Beauty Holdings, Inc. 4.0 % Clear Secure, Inc. Class A 4.0 % MGM Resorts International 3.8 % Alibaba Group Holding Ltd. (China) 3.6 % Illumina, Inc. 3.5 % Charles Schwab Corp. (The) 3.2 % |
| C000132937 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Meridian Hedged Equity Fund |
| Class Name | Class A |
| Trading Symbol | MRAEX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Meridian Hedged Equity Fund (“Fund”) for the period of July 1, 2023 to June 30, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can also request this information by contacting us at 1-800-446-6662. This report describes changes to the Fund that occurred during the reporting period. You can find additional information about the Fund at www.arrowmarkpartners.com/meridian/ |
| Additional Information Phone Number | 1-800-446-6662 |
| Additional Information Website | www.arrowmarkpartners.com/meridian/ |
| Expenses [Text Block] | What were the Fund expenses for the last year? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage Meridian Hedged Equity Fund $ 1.53 % |
| Expenses Paid, Amount | $ 164 |
| Expense Ratio, Percent | 1.53% |
| Factors Affecting Performance [Text Block] | What drove fund performance during the past 12 months U.S. equities moved higher over the 12-month period ended June 30, 2024. In our view, resilient economic growth, a strong labor market, higher corporate earnings, and easing inflation gave investors the support they needed to look past higher interest rates and bid stocks higher. Large-cap growth companies’ index returned 33.5% while all large caps’ index returned 23.9%. At period end, approximately 40% of the portfolio was unhedged, with long-term capital growth the primary objective. The rest of the Fund is invested in companies with covered call options, a strategy that seeks to balance the capital growth potential of the underlying companies with downside protection provided by the income generated from writing options. The contracts we write are structured to allow our fundamental thesis to play out while the strategy gains valuable income and potential downside protection. Contributing positively to performance, were several names in the information technology sector. Conversely, select holdings in the consumer discretionary sector detracted from relative performance. |
| Performance Past Does Not Indicate Future [Text] | Past performance is not predictive of future performance. |
| Line Graph [Table Text Block] | How has the Fund historically performed? This chart assumes an initial investment of $10,000 made on July 1, 2014 for Class A including any applicable sales charges or fees. The performance of the other share class may be greater or less than that shown based on differences in inception dates, fees, and sales charges. Performance assumes reinvestment of dividends and capital gain distributions. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years Since Inception (1) Meridian Hedged Equity Fund (Class A/(MRAEX)) 14.09 % 10.83 % 11.72 % 11.67 % Meridian Hedged Equity Fund (Class A/(MRAEX)) (2) 7.51 % 9.52 % 11.06 % 11.05 % S&P 500 ® 24.56 % 15.05 % 12.86 % 10.36 % CBOE S&P 500 Buy Write Index 8.91 % 5.56 % 5.77 % 5.46 % (1) Inception date of Class A is 11/15/13 (2) Assuming maximum sales charge, if any. Class A Shares are subject to a maximum initial sales charge of 5.75% |
| Performance Inception Date | Nov. 15, 2013 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares |
| Updated Performance Information Location [Text Block] | To obtain a prospectus, please contact your investment representative or the Funds' transfer agent at 1-800-446-6662 or access our website at www.arrowmarkpartners.com/meridian |
| Net Assets | $ 45,273,958 |
| Holdings Count | Holding | 113 |
| Advisory Fees Paid, Amount | $ 325,145 |
| Investment Company Portfolio Turnover | 33% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fee paid $ % Portfolio turnover rate as of the end of the reporting period $ % |
| Holdings [Text Block] | Top Ten Holdings NVIDIA Corp. 7.8 % QUALCOMM, Inc. 5.4 % D.R. Horton, Inc. 4.2 % Live Nation Entertainment, Inc. 4.0 % Sally Beauty Holdings, Inc. 4.0 % Clear Secure, Inc. Class A 4.0 % MGM Resorts International 3.8 % Alibaba Group Holding Ltd. (China) 3.6 % Illumina, Inc. 3.5 % Charles Schwab Corp. (The) 3.2 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings NVIDIA Corp. 7.8 % QUALCOMM, Inc. 5.4 % D.R. Horton, Inc. 4.2 % Live Nation Entertainment, Inc. 4.0 % Sally Beauty Holdings, Inc. 4.0 % Clear Secure, Inc. Class A 4.0 % MGM Resorts International 3.8 % Alibaba Group Holding Ltd. (China) 3.6 % Illumina, Inc. 3.5 % Charles Schwab Corp. (The) 3.2 % |
| C000156527 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Meridian Hedged Equity Fund |
| Class Name | Class C |
| Trading Symbol | MRCEX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Meridian Hedged Equity Fund (“Fund”) for the period of July 1, 2023 to June 30, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can also request this information by contacting us at 1-800-446-6662. This report describes changes to the Fund that occurred during the reporting period. You can find additional information about the Fund at www.arrowmarkpartners.com/meridian/ |
| Additional Information Phone Number | 1-800-446-6662 |
| Additional Information Website | www.arrowmarkpartners.com/meridian/ |
| Expenses [Text Block] | What were the Fund expenses for the last year? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage Meridian Hedged Equity Fund $ 2.17 % |
| Expenses Paid, Amount | $ 231 |
| Expense Ratio, Percent | 2.17% |
| Factors Affecting Performance [Text Block] | What drove fund performance during the past 12 months U.S. equities moved higher over the 12-month period ended June 30, 2024. In our view, resilient economic growth, a strong labor market, higher corporate earnings, and easing inflation gave investors the support they needed to look past higher interest rates and bid stocks higher. Large-cap growth companies’ index returned 33.5% while all large caps’ index returned 23.9%. At period end, approximately 40% of the portfolio was unhedged, with long-term capital growth the primary objective. The rest of the Fund is invested in companies with covered call options, a strategy that seeks to balance the capital growth potential of the underlying companies with downside protection provided by the income generated from writing options. The contracts we write are structured to allow our fundamental thesis to play out while the strategy gains valuable income and potential downside protection. Contributing positively to performance, were several names in the information technology sector. Conversely, select holdings in the consumer discretionary sector detracted from relative performance. |
| Performance Past Does Not Indicate Future [Text] | Past performance is not predictive of future performance. |
| Line Graph [Table Text Block] | How has the Fund historically performed? This chart assumes an initial investment of $10,000 made on July 1, 2015 for Class C including any applicable sales charges or fees. The performance of the other share class may be greater or less than that shown based on differences in inception dates, fees, and sales charges. Performance assumes reinvestment of dividends and capital gain distributions. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years Since Inception (1) Meridian Hedged Equity Fund (Class C/(MRCEX)) 13.35 % 10.36 % 0.00 % 12.04 % S&P 500 ® 24.56 % 15.05 % 12.86 % 10.36 % CBOE S&P 500 Buy Write Index 8.91 % 5.56 % 5.77 % 5.46 % (1) Inception date of Class C is 07/01/15 |
| Performance Inception Date | Jul. 01, 2015 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. |
| Updated Performance Information Location [Text Block] | To obtain a prospectus, please contact your investment representative or the Funds' transfer agent at 1-800-446-6662 or access our website at www.arrowmarkpartners.com/meridian |
| Net Assets | $ 45,273,958 |
| Holdings Count | Holding | 113 |
| Advisory Fees Paid, Amount | $ 325,145 |
| Investment Company Portfolio Turnover | 33% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fee paid $ % Portfolio turnover rate as of the end of the reporting period $ % |
| Holdings [Text Block] | Top Ten Holdings NVIDIA Corp. 7.8 % QUALCOMM, Inc. 5.4 % D.R. Horton, Inc. 4.2 % Live Nation Entertainment, Inc. 4.0 % Sally Beauty Holdings, Inc. 4.0 % Clear Secure, Inc. Class A 4.0 % MGM Resorts International 3.8 % Alibaba Group Holding Ltd. (China) 3.6 % Illumina, Inc. 3.5 % Charles Schwab Corp. (The) 3.2 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings NVIDIA Corp. 7.8 % QUALCOMM, Inc. 5.4 % D.R. Horton, Inc. 4.2 % Live Nation Entertainment, Inc. 4.0 % Sally Beauty Holdings, Inc. 4.0 % Clear Secure, Inc. Class A 4.0 % MGM Resorts International 3.8 % Alibaba Group Holding Ltd. (China) 3.6 % Illumina, Inc. 3.5 % Charles Schwab Corp. (The) 3.2 % |
| C000132936 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Meridian Hedged Equity Fund |
| Class Name | Investor Class |
| Trading Symbol | MRIEX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Meridian Hedged Equity Fund (“Fund”) for the period of July 1, 2023 to June 30, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can also request this information by contacting us at 1-800-446-6662. This report describes changes to the Fund that occurred during the reporting period. You can find additional information about the Fund at www.arrowmarkpartners.com/meridian/ |
| Additional Information Phone Number | 1-800-446-6662 |
| Additional Information Website | www.arrowmarkpartners.com/meridian/ |
| Expenses [Text Block] | What were the Fund expenses for the last year? (Based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage Meridian Hedged Equity Fund $ 1.28 % |
| Expenses Paid, Amount | $ 137 |
| Expense Ratio, Percent | 1.28% |
| Factors Affecting Performance [Text Block] | What drove fund performance during the past 12 months U.S. equities moved higher over the 12-month period ended June 30, 2024. In our view, resilient economic growth, a strong labor market, higher corporate earnings, and easing inflation gave investors the support they needed to look past higher interest rates and bid stocks higher. Large-cap growth companies’ index returned 33.5% while all large caps’ index returned 23.9%. At period end, approximately 40% of the portfolio was unhedged, with long-term capital growth the primary objective. The rest of the Fund is invested in companies with covered call options, a strategy that seeks to balance the capital growth potential of the underlying companies with downside protection provided by the income generated from writing options. The contracts we write are structured to allow our fundamental thesis to play out while the strategy gains valuable income and potential downside protection. Contributing positively to performance, were several names in the information technology sector. Conversely, select holdings in the consumer discretionary sector detracted from relative performance. |
| Performance Past Does Not Indicate Future [Text] | Past performance is not predictive of future performance. |
| Line Graph [Table Text Block] | How has the Fund historically performed? This chart assumes an initial investment of $10,000 made on July 1, 2014 for Investor Class including any applicable sales charges or fees. The performance of the other share class may be greater or less than that shown based on differences in inception dates, fees, and sales charges. Performance assumes reinvestment of dividends and capital gain distributions. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years Since Inception (1) Meridian Hedged Equity Fund (Investor Class/(MRIEX)) 14.34 % 11.17 % 12.00 % 11.96 % S&P 500 ® 24.56 % 15.05 % 12.86 % 10.36 % CBOE S&P 500 Buy Write Index 8.91 % 5.56 % 5.77 % 5.46 % (1) Inception date of Investor Class is 11/15/13 |
| Performance Inception Date | Nov. 15, 2013 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares |
| Updated Performance Information Location [Text Block] | To obtain a prospectus, please contact your investment representative or the Funds' transfer agent at 1-800-446-6662 or access our website at www.arrowmarkpartners.com/meridian |
| Net Assets | $ 45,273,958 |
| Holdings Count | Holding | 113 |
| Advisory Fees Paid, Amount | $ 325,145 |
| Investment Company Portfolio Turnover | 33% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fee paid $ % Portfolio turnover rate as of the end of the reporting period $ % |
| Holdings [Text Block] | Top Ten Holdings NVIDIA Corp. 7.8 % QUALCOMM, Inc. 5.4 % D.R. Horton, Inc. 4.2 % Live Nation Entertainment, Inc. 4.0 % Sally Beauty Holdings, Inc. 4.0 % Clear Secure, Inc. Class A 4.0 % MGM Resorts International 3.8 % Alibaba Group Holding Ltd. (China) 3.6 % Illumina, Inc. 3.5 % Charles Schwab Corp. (The) 3.2 % Sector Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings NVIDIA Corp. 7.8 % QUALCOMM, Inc. 5.4 % D.R. Horton, Inc. 4.2 % Live Nation Entertainment, Inc. 4.0 % Sally Beauty Holdings, Inc. 4.0 % Clear Secure, Inc. Class A 4.0 % MGM Resorts International 3.8 % Alibaba Group Holding Ltd. (China) 3.6 % Illumina, Inc. 3.5 % Charles Schwab Corp. (The) 3.2 % |
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | 60 Months Ended | 108 Months Ended | 114 Months Ended | 120 Months Ended | 127 Months Ended | 128 Months Ended | 233 Months Ended | 365 Months Ended | 479 Months Ended | ||||||||||||||||||||
| Jun. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016 | Jul. 01, 2015 | Jun. 30, 2015 | Dec. 24, 2014 | Jun. 30, 2014 | |||||||||
| C000132293 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Small Cap Growth Fund (Legacy Class/(MSGGX)) | |||||||||||||||||||||||||||||
| Account Value | $ 21,667 | $ 21,667 | $ 21,667 | $ 21,667 | $ 21,667 | $ 21,667 | $ 21,667 | $ 21,667 | $ 21,667 | $ 21,667 | $ 20,768 | $ 17,864 | $ 26,420 | $ 16,358 | $ 16,551 | $ 16,801 | $ 13,478 | $ 10,616 | $ 11,423 | $ 10,000 | ||||||||||
| Average Annual Return, Percent | 4.33% | 5.54% | 8.04% | 9.19% | [1] | |||||||||||||||||||||||||
| C000132296 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Small Cap Growth Fund (Institutional Class/(MSGRX)) | |||||||||||||||||||||||||||||
| Account Value | $ 2,028,832 | $ 2,028,832 | 2,028,832 | $ 2,028,832 | $ 2,028,832 | $ 2,028,832 | 2,028,832 | 2,028,832 | 2,028,832 | 2,028,832 | 1,942,430 | 1,669,109 | 2,467,463 | 1,527,000 | 1,543,850 | 1,565,225 | 1,255,618 | 987,210 | 1,061,325 | $ 1,000,000 | ||||||||||
| Average Annual Return, Percent | 4.45% | 5.62% | 7.72% | [2] | 0% | |||||||||||||||||||||||||
| C000132295 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Small Cap Growth Fund (Class A/(MSGAX)) | |||||||||||||||||||||||||||||
| Average Annual Return, Percent | [3] | (1.91%) | 3.95% | 7.05% | 8.22% | [4] | ||||||||||||||||||||||||
| C000132295 [Member] | Without Sales Load [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Small Cap Growth Fund (Class A/(MSGAX)) | |||||||||||||||||||||||||||||
| Account Value | $ 20,972 | $ 20,972 | 20,972 | $ 20,972 | $ 20,972 | $ 20,972 | 20,972 | 20,972 | 20,972 | 20,972 | 20,158 | 17,392 | 25,817 | 16,031 | 16,290 | 16,581 | 13,343 | 10,538 | 11,381 | 10,000 | ||||||||||
| Average Annual Return, Percent | 4.04% | 5.18% | 7.69% | 8.83% | [4] | |||||||||||||||||||||||||
| C000156530 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Small Cap Growth Fund (Class C/(MSGCX)) | |||||||||||||||||||||||||||||
| Account Value | $ 17,310 | $ 17,310 | $ 17,310 | 17,310 | $ 17,310 | $ 17,310 | 17,310 | 17,310 | 17,310 | 17,310 | 16,750 | 14,561 | 21,765 | 13,608 | 13,921 | 14,271 | 11,567 | 9,200 | $ 10,000 | |||||||||||
| Average Annual Return, Percent | 3.35% | 4.45% | 6.29% | [5] | 0% | |||||||||||||||||||||||||
| C000132294 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Small Cap Growth Fund (Investor Class/(MISGX)) | |||||||||||||||||||||||||||||
| Account Value | $ 21,526 | $ 21,526 | $ 21,526 | 21,526 | $ 21,526 | $ 21,526 | 21,526 | 21,526 | 21,526 | 21,526 | 20,641 | 17,761 | 26,291 | 16,278 | 16,504 | 16,766 | 13,460 | 10,598 | 11,414 | 10,000 | ||||||||||
| Average Annual Return, Percent | 4.29% | 5.46% | 7.97% | 9.12% | [6] | |||||||||||||||||||||||||
| C000003882 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Growth Fund (Legacy Class/(MERDX)) | |||||||||||||||||||||||||||||
| Account Value | $ 20,814 | $ 20,814 | 20,814 | 20,814 | $ 20,814 | $ 20,814 | 20,814 | 20,814 | 20,814 | $ 20,814 | 20,723 | 18,073 | 25,527 | 16,352 | 16,589 | 16,103 | 13,404 | 10,857 | 11,185 | 10,000 | ||||||||||
| Average Annual Return, Percent | 0.44% | 4.64% | 7.61% | 11.46% | [7] | |||||||||||||||||||||||||
| C000132941 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Growth Fund (Institutional Class/(MRRGX)) | |||||||||||||||||||||||||||||
| Account Value | $ 1,932,919 | $ 1,932,919 | 1,932,919 | $ 1,932,919 | $ 1,932,919 | 1,932,919 | $ 1,932,919 | 1,932,919 | 1,932,919 | $ 1,932,919 | 1,923,923 | 1,677,445 | 2,368,216 | 1,516,833 | 1,538,011 | 1,493,241 | 1,242,526 | 1,006,282 | 1,037,047 | 1,000,000 | ||||||||||
| Average Annual Return, Percent | 0.47% | 4.68% | 7.17% | [8] | 0% | |||||||||||||||||||||||||
| C000132940 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Growth Fund (Class A/(MRAGX)) | |||||||||||||||||||||||||||||
| Average Annual Return, Percent | [9] | (5.64%) | 3.11% | 6.59% | 6.75% | [10] | ||||||||||||||||||||||||
| C000132940 [Member] | Without Sales Load [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Growth Fund (Class A/(MRAGX)) | |||||||||||||||||||||||||||||
| Account Value | $ 20,084 | $ 20,084 | 20,084 | $ 20,084 | $ 20,084 | 20,084 | $ 20,084 | 20,084 | 20,084 | 20,084 | 20,059 | 17,521 | 24,829 | 15,955 | 16,239 | 15,817 | 13,202 | 10,725 | 11,108 | 10,000 | ||||||||||
| Average Annual Return, Percent | 0.25% | 4.34% | 7.22% | 7.35% | [10] | |||||||||||||||||||||||||
| C000156528 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Growth Fund (Class C/(MRCGX)) | |||||||||||||||||||||||||||||
| Account Value | $ 16,979 | $ 16,979 | $ 16,979 | 16,979 | $ 16,979 | 16,979 | $ 16,979 | 16,979 | 16,979 | 16,979 | 17,075 | 15,036 | 21,454 | 13,887 | 14,231 | 13,957 | 11,738 | 9,605 | 10,000 | |||||||||||
| Average Annual Return, Percent | (0.43%) | 3.59% | 6.06% | [11] | 0% | |||||||||||||||||||||||||
| C000132939 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Growth Fund (Investor Class/(MRIGX)) | |||||||||||||||||||||||||||||
| Account Value | $ 20,656 | $ 20,656 | $ 20,656 | 20,656 | $ 20,656 | 20,656 | $ 20,656 | 20,656 | 20,656 | 20,656 | 20,577 | 17,954 | 25,375 | 16,265 | 16,503 | 16,027 | 13,349 | 10,817 | 11,156 | 10,000 | ||||||||||
| Average Annual Return, Percent | 0.39% | 4.59% | 7.52% | 7.65% | [12] | |||||||||||||||||||||||||
| C000003883 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Contrarian Fund (Legacy Class/(MVALX)) | |||||||||||||||||||||||||||||
| Account Value | $ 24,296 | $ 24,296 | 24,296 | 24,296 | $ 24,296 | 24,296 | $ 24,296 | 24,296 | $ 24,296 | 24,296 | 23,584 | 20,381 | 24,608 | 14,756 | 15,516 | 15,523 | 12,346 | 10,009 | 10,684 | 10,000 | ||||||||||
| Average Annual Return, Percent | 3.02% | 9.38% | 9.28% | 12.12% | [13] | |||||||||||||||||||||||||
| C000132943 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Contrarian Fund (Class A/(MFCAX)) | |||||||||||||||||||||||||||||
| Average Annual Return, Percent | [14] | (3.16%) | 7.77% | 8.23% | 8.41% | [15] | ||||||||||||||||||||||||
| C000132943 [Member] | Without Sales Load [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Contrarian Fund (Class A/(MFCAX)) | |||||||||||||||||||||||||||||
| Account Value | $ 23,403 | $ 23,403 | 23,403 | 23,403 | $ 23,403 | 23,403 | $ 23,403 | 23,403 | $ 23,403 | 23,403 | 22,778 | 19,750 | 23,911 | 14,386 | 15,177 | 15,242 | 12,177 | 9,920 | 10,638 | 10,000 | ||||||||||
| Average Annual Return, Percent | 2.74% | 9.05% | 8.87% | 9.02% | [15] | |||||||||||||||||||||||||
| C000156529 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Contrarian Fund (Class C/(MFCCX)) | |||||||||||||||||||||||||||||
| Account Value | $ 20,679 | $ 20,679 | $ 20,679 | 20,679 | $ 20,679 | 20,679 | $ 20,679 | 20,679 | 20,679 | 20,679 | 20,288 | 17,719 | 21,610 | 13,095 | 13,914 | 14,059 | 11,296 | 9,250 | 10,000 | |||||||||||
| Average Annual Return, Percent | 1.93% | 8.25% | 8.41% | [16] | 0% | |||||||||||||||||||||||||
| C000132942 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Contrarian Fund (Investor Class/(MFCIX)) | |||||||||||||||||||||||||||||
| Account Value | $ 24,021 | $ 24,021 | $ 24,021 | 24,021 | $ 24,021 | 24,021 | $ 24,021 | 24,021 | 24,021 | 24,021 | 23,322 | 20,165 | 24,357 | 14,616 | 15,379 | 15,397 | 12,274 | 9,973 | 10,667 | 10,000 | ||||||||||
| Average Annual Return, Percent | 3% | 9.33% | 9.16% | 9.30% | [17] | |||||||||||||||||||||||||
| C000003881 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Hedged Equity Fund (Legacy Class/(MEIFX)) | |||||||||||||||||||||||||||||
| Account Value | $ 31,303 | $ 31,303 | 31,303 | 31,303 | $ 31,303 | 31,303 | $ 31,303 | $ 31,303 | 31,303 | 31,303 | 27,370 | 24,543 | 28,379 | 21,312 | 18,404 | 16,541 | 11,918 | 10,096 | 10,446 | 10,000 | ||||||||||
| Average Annual Return, Percent | 14.37% | 11.21% | 12.09% | 9.84% | [18] | |||||||||||||||||||||||||
| C000132937 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Hedged Equity Fund (Class A/(MRAEX)) | |||||||||||||||||||||||||||||
| Average Annual Return, Percent | [19] | 7.51% | 9.52% | 11.06% | 11.05% | [20] | ||||||||||||||||||||||||
| C000132937 [Member] | Without Sales Load [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Hedged Equity Fund (Class A/(MRAEX)) | |||||||||||||||||||||||||||||
| Account Value | $ 30,280 | $ 30,280 | 30,280 | 30,280 | $ 30,280 | 30,280 | $ 30,280 | $ 30,280 | 30,280 | 30,280 | 26,541 | 23,901 | 27,726 | 20,882 | 18,106 | 16,322 | 11,807 | 10,032 | 10,424 | 10,000 | ||||||||||
| Average Annual Return, Percent | 14.09% | 10.83% | 11.72% | 11.67% | [20] | |||||||||||||||||||||||||
| C000156527 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Hedged Equity Fund (Class C/(MRCEX)) | |||||||||||||||||||||||||||||
| Account Value | $ 27,811 | $ 27,811 | $ 27,811 | 27,811 | $ 27,811 | 27,811 | $ 27,811 | 27,811 | 27,811 | 27,811 | 24,535 | 22,182 | 25,862 | 19,552 | 16,990 | 15,402 | 11,193 | 9,545 | 10,000 | |||||||||||
| Average Annual Return, Percent | 13.35% | 10.36% | 12.04% | [21] | 0% | |||||||||||||||||||||||||
| C000132936 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Meridian Hedged Equity Fund (Investor Class/(MRIEX)) | |||||||||||||||||||||||||||||
| Account Value | $ 31,064 | $ 31,064 | $ 31,064 | 31,064 | $ 31,064 | 31,064 | $ 31,064 | 31,064 | 31,064 | 31,064 | 27,168 | 24,393 | 28,214 | 21,156 | 18,293 | 16,440 | 11,890 | 10,077 | 10,444 | 10,000 | ||||||||||
| Average Annual Return, Percent | 14.34% | 11.17% | 12% | 11.96% | [22] | |||||||||||||||||||||||||
| Russell 2000 Growth Index [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Russell 2000® Growth Index | |||||||||||||||||||||||||||||
| Account Value | $ 20,400 | $ 20,400 | $ 20,400 | $ 20,400 | $ 20,400 | $ 20,400 | $ 20,400 | 20,400 | 20,400 | 20,400 | 18,692 | 15,770 | 23,690 | 15,651 | 15,125 | 15,200 | 12,473 | 10,026 | 10,000 | 11,234 | 1,000,000 | 10,000 | ||||||||
| Average Annual Return, Percent | 9.14% | 6.17% | 7.66% | [5] | 7.66% | [2] | 7.39% | 7.66% | [1] | |||||||||||||||||||||
| Russell 3000 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Russell 3000® | |||||||||||||||||||||||||||||
| Account Value | $ 31,475 | $ 31,475 | $ 31,475 | $ 31,475 | $ 31,475 | $ 31,475 | $ 31,475 | 31,475 | $ 31,475 | $ 31,475 | 25,563 | 21,490 | 24,949 | 17,306 | 16,246 | 14,907 | 12,987 | 10,959 | 10,000 | 10,729 | 1,000,000 | 10,000 | ||||||||
| Average Annual Return, Percent | 23.13% | 14.14% | 11.67% | [11] | 11.67% | [8] | 12.15% | 12.58% | [1] | 11.67% | [10] | 10.34% | [13] | 11.67% | [7] | |||||||||||||||
| Standard & Poor's 500 Index [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | S&P 500® Index | |||||||||||||||||||||||||||||
| Account Value | $ 33,521 | $ 33,521 | $ 33,521 | $ 33,521 | $ 33,521 | $ 33,521 | $ 33,521 | $ 33,521 | $ 33,521 | $ 33,521 | 26,912 | 22,503 | 25,175 | 17,881 | 16,633 | 15,064 | 13,170 | 11,171 | 10,000 | 10,742 | 10,000 | |||||||||
| Average Annual Return, Percent | 24.56% | 15.05% | 10.36% | [21] | 12.86% | 10.36% | [20] | 10.36% | [18] | |||||||||||||||||||||
| Russell 2500 Growth Index [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Russell 2500® Growth Index | |||||||||||||||||||||||||||||
| Account Value | $ 23,187 | $ 23,187 | $ 23,187 | $ 23,187 | $ 23,187 | 23,187 | $ 23,187 | $ 23,187 | 23,187 | $ 23,187 | 21,268 | 17,935 | 26,299 | 17,576 | 16,093 | 15,163 | 12,477 | 10,274 | 10,000 | 11,130 | $ 1,000,000 | 10,000 | ||||||||
| Average Annual Return, Percent | 9.02% | 7.58% | [11],[23] | [8],[24] | 8.77% | [10],[25] | [7],[26] | |||||||||||||||||||||||
| Russell 2500 Index [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Russell 2500® Index | |||||||||||||||||||||||||||||
| Account Value | $ 21,562 | $ 21,562 | $ 21,562 | $ 21,562 | $ 21,562 | 21,562 | $ 21,562 | 21,562 | $ 21,562 | $ 21,562 | 19,519 | 17,185 | 21,752 | 13,785 | 14,465 | 14,214 | 12,228 | 10,203 | 10,000 | 10,592 | 10,000 | |||||||||
| Average Annual Return, Percent | 10.47% | 8.31% | 9.83% | [16] | 7.99% | 9.83% | [15] | 9.83% | [13] | |||||||||||||||||||||
| Russell 2500 Value Index [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Russell 2500® Value Index | |||||||||||||||||||||||||||||
| Account Value | $ 19,256 | $ 19,256 | $ 19,256 | 19,256 | $ 19,256 | 19,256 | $ 19,256 | 19,256 | $ 19,256 | 19,256 | 17,310 | 15,684 | 18,067 | 11,069 | 13,099 | 13,356 | 11,979 | 10,121 | 10,000 | 10,099 | 10,000 | |||||||||
| Average Annual Return, Percent | 11.24% | 8.01% | [16],[27] | 6.77% | [28] | [13],[29] | ||||||||||||||||||||||||
| 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 | |||||||||||||||||||||||||||||
| Account Value | $ 17,521 | $ 17,521 | $ 17,521 | $ 17,521 | $ 17,521 | $ 17,521 | $ 17,521 | $ 17,521 | $ 17,521 | $ 17,521 | $ 16,087 | $ 14,756 | $ 15,152 | $ 11,905 | $ 13,368 | $ 12,956 | $ 12,077 | $ 10,778 | $ 10,000 | $ 10,364 | $ 10,000 | |||||||||
| Average Annual Return, Percent | 8.91% | 5.56% | 5.46% | [21] | 5.77% | 5.46% | [20] | 5.46% | [18] | |||||||||||||||||||||
| [1]Inception date of Legacy Class is 12/16/13[2]Inception date of Institutional Class is 12/24/14[3]Assuming maximum sales charge, if any. Class A Shares are subject to a maximum initial sales charge of 5.75%[4]Inception date of Class A is 12/16/13[5]Inception date of Class C is 07/01/15[6]Inception date of Investor Class is 12/16/13[7]Inception date of Legacy Class is 08/01/84[8]Inception date of Institutional Class is 12/24/14[9]Assuming maximum sales charge, if any. Class A Shares are subject to a maximum initial sales charge of 5.75%[10]Inception date of Class A is 11/15/13[11]Inception date of Class C is 07/01/15[12]Inception date of Investor Class is 11/15/13[13]Inception date of Legacy Class is 02/10/94[14]Assuming maximum sales charge, if any. Class A Shares are subject to a maximum initial sales charge of 5.75%[15]Inception date of Class A is 11/15/13[16]Inception date of Class C is 07/01/15[17]Inception date of Investor Class is 11/15/13[18]Inception date of Legacy Class is 01/31/05[19]Assuming maximum sales charge, if any. Class A Shares are subject to a maximum initial sales charge of 5.75%[20]Inception date of Class A is 11/15/13[21]Inception date of Class C is 07/01/15[22]Inception date of Investor Class is 11/15/13[23]Inception date of Class C precedes the inception date of the Russell 2500 ® ® ® ® ® ® ® | ||||||||||||||||||||||||||||||
| Shareholder Report, Holdings (Details) | Jun. 30, 2024 |
| C000132293 [Member] | Cargurus Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000132293 [Member] | RB Global Inc Canada [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000132293 [Member] | Turning Point Brands Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000132293 [Member] | ACV Auctions Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000132293 [Member] | Smartsheet Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000132293 [Member] | TransMedics Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000132293 [Member] | Merit Medical Systems Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000132293 [Member] | Mirion Technologies Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000132293 [Member] | PlayAGS Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000132293 [Member] | Stoneridge Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000132293 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000132293 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.90% |
| C000132293 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.20% |
| C000132293 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9% |
| C000132293 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.60% |
| C000132293 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000132293 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.30% |
| C000132293 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.40% |
| C000132293 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.20% |
| C000132293 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000132293 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000132296 [Member] | Cargurus Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000132296 [Member] | RB Global Inc Canada [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000132296 [Member] | Turning Point Brands Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000132296 [Member] | ACV Auctions Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000132296 [Member] | Smartsheet Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000132296 [Member] | TransMedics Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000132296 [Member] | Merit Medical Systems Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000132296 [Member] | Mirion Technologies Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000132296 [Member] | PlayAGS Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000132296 [Member] | Stoneridge Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000132296 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000132296 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.90% |
| C000132296 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.20% |
| C000132296 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9% |
| C000132296 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.60% |
| C000132296 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000132296 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.30% |
| C000132296 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.40% |
| C000132296 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.20% |
| C000132296 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000132296 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000132295 [Member] | Cargurus Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000132295 [Member] | RB Global Inc Canada [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000132295 [Member] | Turning Point Brands Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000132295 [Member] | ACV Auctions Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000132295 [Member] | Smartsheet Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000132295 [Member] | TransMedics Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000132295 [Member] | Merit Medical Systems Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000132295 [Member] | Mirion Technologies Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000132295 [Member] | PlayAGS Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000132295 [Member] | Stoneridge Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000132295 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000132295 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.90% |
| C000132295 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.20% |
| C000132295 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9% |
| C000132295 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.60% |
| C000132295 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000132295 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.30% |
| C000132295 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.40% |
| C000132295 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.20% |
| C000132295 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000132295 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000156530 [Member] | Cargurus Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000156530 [Member] | RB Global Inc Canada [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000156530 [Member] | Turning Point Brands Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000156530 [Member] | ACV Auctions Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000156530 [Member] | Smartsheet Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000156530 [Member] | TransMedics Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000156530 [Member] | Merit Medical Systems Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000156530 [Member] | Mirion Technologies Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000156530 [Member] | PlayAGS Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000156530 [Member] | Stoneridge Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000156530 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000156530 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.90% |
| C000156530 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.20% |
| C000156530 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9% |
| C000156530 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.60% |
| C000156530 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000156530 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.30% |
| C000156530 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.40% |
| C000156530 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.20% |
| C000156530 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000156530 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000132294 [Member] | Cargurus Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000132294 [Member] | RB Global Inc Canada [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000132294 [Member] | Turning Point Brands Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000132294 [Member] | ACV Auctions Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000132294 [Member] | Smartsheet Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000132294 [Member] | TransMedics Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000132294 [Member] | Merit Medical Systems Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000132294 [Member] | Mirion Technologies Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000132294 [Member] | PlayAGS Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000132294 [Member] | Stoneridge Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000132294 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000132294 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.90% |
| C000132294 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.20% |
| C000132294 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9% |
| C000132294 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.60% |
| C000132294 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000132294 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.30% |
| C000132294 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.40% |
| C000132294 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.20% |
| C000132294 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000132294 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000003882 [Member] | Cargurus Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| C000003882 [Member] | RB Global Inc Canada [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000003882 [Member] | ACV Auctions Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000003882 [Member] | Smartsheet Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000003882 [Member] | Trimble Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000003882 [Member] | Ziff Davis Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000003882 [Member] | Churchill Downs Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| C000003882 [Member] | Sensata Technologies Holding Plc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000003882 [Member] | Euronet Worldwide Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000003882 [Member] | STERIS Plc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000003882 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000003882 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.90% |
| C000003882 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000003882 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.30% |
| C000003882 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.60% |
| C000003882 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000003882 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.70% |
| C000003882 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18% |
| C000003882 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000003882 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000132941 [Member] | Cargurus Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| C000132941 [Member] | RB Global Inc Canada [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000132941 [Member] | ACV Auctions Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000132941 [Member] | Smartsheet Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000132941 [Member] | Trimble Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000132941 [Member] | Ziff Davis Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000132941 [Member] | Churchill Downs Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| C000132941 [Member] | Sensata Technologies Holding Plc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000132941 [Member] | Euronet Worldwide Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000132941 [Member] | STERIS Plc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000132941 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000132941 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.90% |
| C000132941 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000132941 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.30% |
| C000132941 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.60% |
| C000132941 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000132941 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.70% |
| C000132941 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18% |
| C000132941 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000132941 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000132940 [Member] | Cargurus Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| C000132940 [Member] | RB Global Inc Canada [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000132940 [Member] | ACV Auctions Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000132940 [Member] | Smartsheet Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000132940 [Member] | Trimble Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000132940 [Member] | Ziff Davis Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000132940 [Member] | Churchill Downs Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| C000132940 [Member] | Sensata Technologies Holding Plc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000132940 [Member] | Euronet Worldwide Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000132940 [Member] | STERIS Plc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000132940 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000132940 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.90% |
| C000132940 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000132940 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.30% |
| C000132940 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.60% |
| C000132940 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000132940 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.70% |
| C000132940 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18% |
| C000132940 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000132940 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000156528 [Member] | Cargurus Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| C000156528 [Member] | RB Global Inc Canada [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000156528 [Member] | ACV Auctions Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000156528 [Member] | Smartsheet Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000156528 [Member] | Trimble Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000156528 [Member] | Ziff Davis Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000156528 [Member] | Churchill Downs Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| C000156528 [Member] | Sensata Technologies Holding Plc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000156528 [Member] | Euronet Worldwide Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000156528 [Member] | STERIS Plc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000156528 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000156528 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.90% |
| C000156528 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000156528 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.30% |
| C000156528 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.60% |
| C000156528 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000156528 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.70% |
| C000156528 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18% |
| C000156528 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000156528 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000132939 [Member] | Cargurus Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| C000132939 [Member] | RB Global Inc Canada [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000132939 [Member] | ACV Auctions Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000132939 [Member] | Smartsheet Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000132939 [Member] | Trimble Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000132939 [Member] | Ziff Davis Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000132939 [Member] | Churchill Downs Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| C000132939 [Member] | Sensata Technologies Holding Plc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000132939 [Member] | Euronet Worldwide Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000132939 [Member] | STERIS Plc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000132939 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000132939 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.90% |
| C000132939 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000132939 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.30% |
| C000132939 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.60% |
| C000132939 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000132939 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.70% |
| C000132939 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18% |
| C000132939 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000132939 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000003883 [Member] | First Citizens BancShares Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| C000003883 [Member] | CACI International Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000003883 [Member] | Brookfield Renewable Corp Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000003883 [Member] | VICI Properties Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000003883 [Member] | Tenet Healthcare Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| C000003883 [Member] | Axis Capital Holdings Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000003883 [Member] | SMART Global Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000003883 [Member] | Cameco Corp Canada [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000003883 [Member] | California Resources Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000003883 [Member] | Perrigo Co Plc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000003883 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.30% |
| C000003883 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.90% |
| C000003883 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000003883 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000003883 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.20% |
| C000003883 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000003883 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.20% |
| C000003883 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.20% |
| C000003883 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.20% |
| C000003883 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.40% |
| C000003883 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.40% |
| C000132943 [Member] | First Citizens BancShares Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| C000132943 [Member] | CACI International Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000132943 [Member] | Brookfield Renewable Corp Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000132943 [Member] | VICI Properties Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000132943 [Member] | Tenet Healthcare Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| C000132943 [Member] | Axis Capital Holdings Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000132943 [Member] | SMART Global Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000132943 [Member] | Cameco Corp Canada [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000132943 [Member] | California Resources Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000132943 [Member] | Perrigo Co Plc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000132943 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.30% |
| C000132943 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.90% |
| C000132943 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000132943 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000132943 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.20% |
| C000132943 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000132943 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.20% |
| C000132943 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.20% |
| C000132943 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.20% |
| C000132943 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.40% |
| C000132943 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.40% |
| C000156529 [Member] | First Citizens BancShares Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| C000156529 [Member] | CACI International Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000156529 [Member] | Brookfield Renewable Corp Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000156529 [Member] | VICI Properties Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000156529 [Member] | Tenet Healthcare Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| C000156529 [Member] | Axis Capital Holdings Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000156529 [Member] | SMART Global Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000156529 [Member] | Cameco Corp Canada [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000156529 [Member] | California Resources Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000156529 [Member] | Perrigo Co Plc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000156529 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.30% |
| C000156529 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.90% |
| C000156529 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000156529 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000156529 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.20% |
| C000156529 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000156529 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.20% |
| C000156529 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.20% |
| C000156529 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.20% |
| C000156529 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.40% |
| C000156529 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.40% |
| C000132942 [Member] | First Citizens BancShares Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| C000132942 [Member] | CACI International Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000132942 [Member] | Brookfield Renewable Corp Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000132942 [Member] | VICI Properties Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000132942 [Member] | Tenet Healthcare Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| C000132942 [Member] | Axis Capital Holdings Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000132942 [Member] | SMART Global Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000132942 [Member] | Cameco Corp Canada [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000132942 [Member] | California Resources Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000132942 [Member] | Perrigo Co Plc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000132942 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.30% |
| C000132942 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.90% |
| C000132942 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000132942 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000132942 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.20% |
| C000132942 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000132942 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.20% |
| C000132942 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.20% |
| C000132942 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.20% |
| C000132942 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.40% |
| C000132942 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.40% |
| C000003881 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.80% |
| C000003881 [Member] | QUALCOMM Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| C000003881 [Member] | D R Horton Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000003881 [Member] | Live Nation Entertainment Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| C000003881 [Member] | Sally Beauty Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| C000003881 [Member] | Clear Secure Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| C000003881 [Member] | MGM Resorts International [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000003881 [Member] | Alibaba Group Holding Ltd China [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000003881 [Member] | Illumina Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| C000003881 [Member] | Charles Schwab Corp The [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000003881 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000003881 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000003881 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000003881 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.20% |
| C000003881 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.90% |
| C000003881 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8% |
| C000003881 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.40% |
| C000003881 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.60% |
| C000003881 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000003881 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000003881 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.70% |
| C000132937 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.80% |
| C000132937 [Member] | QUALCOMM Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| C000132937 [Member] | D R Horton Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000132937 [Member] | Live Nation Entertainment Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| C000132937 [Member] | Sally Beauty Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| C000132937 [Member] | Clear Secure Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| C000132937 [Member] | MGM Resorts International [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000132937 [Member] | Alibaba Group Holding Ltd China [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000132937 [Member] | Illumina Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| C000132937 [Member] | Charles Schwab Corp The [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000132937 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000132937 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000132937 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000132937 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.20% |
| C000132937 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.90% |
| C000132937 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8% |
| C000132937 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.40% |
| C000132937 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.60% |
| C000132937 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000132937 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000132937 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.70% |
| C000156527 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.80% |
| C000156527 [Member] | QUALCOMM Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| C000156527 [Member] | D R Horton Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000156527 [Member] | Live Nation Entertainment Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| C000156527 [Member] | Sally Beauty Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| C000156527 [Member] | Clear Secure Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| C000156527 [Member] | MGM Resorts International [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000156527 [Member] | Alibaba Group Holding Ltd China [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000156527 [Member] | Illumina Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| C000156527 [Member] | Charles Schwab Corp The [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000156527 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000156527 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000156527 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000156527 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.20% |
| C000156527 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.90% |
| C000156527 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8% |
| C000156527 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.40% |
| C000156527 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.60% |
| C000156527 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000156527 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000156527 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.70% |
| C000132936 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.80% |
| C000132936 [Member] | QUALCOMM Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| C000132936 [Member] | D R Horton Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000132936 [Member] | Live Nation Entertainment Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| C000132936 [Member] | Sally Beauty Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| C000132936 [Member] | Clear Secure Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| C000132936 [Member] | MGM Resorts International [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000132936 [Member] | Alibaba Group Holding Ltd China [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000132936 [Member] | Illumina Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| C000132936 [Member] | Charles Schwab Corp The [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000132936 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000132936 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000132936 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000132936 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.20% |
| C000132936 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.90% |
| C000132936 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8% |
| C000132936 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.40% |
| C000132936 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.60% |
| C000132936 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000132936 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000132936 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.70% |
