M International Equity Fund Market Risk [Member] Economic And Market Events Risk [Member] Additional Market Disruption Risk [Member] Profitability Investment Risk [Member] Value Investment Risk [Member] Small And Medium Capitalization Companies Risk [Member] Foreign Securities And Currencies Risk [Member] Emerging Markets Risk [Member] China Investments Risk [Member] Fund Of Funds Risk [Member] Management Risk [Member] Liquidity Risk [Member] Derivatives Risk [Member] Operational Risk [Member] Cyber Security Risk [Member] M Large Cap Growth Fund Active Trading Risk [Member] Growth Securities Risk [Member] Large Capitalization Investing Risk [Member] Sector Risk [Member] Quantitative Modeling Risk [Member] M Capital Appreciation Fund M Large Cap Value Fund M International Equity Fund M Large Cap Growth Fund M Capital Appreciation Fund M Large Cap Value Fund MSCI ACWI (All Country World Index) ex USA IMI Index S&P 500 Index Russell 1000 Growth Index (reflects no deduction for fees, expenses or taxes) Russell 2500 Index (reflects no deduction for fees, expenses or taxes) Russell 1000 Index Russell 1000 Value Index (reflects no deduction for fees, expenses or taxes) M International Equity Fund [Default Label] M Large Cap Growth Fund [Default Label] M Capital Appreciation Fund [Default Label] M Large Cap Value Fund [Default Label]