Money Market Seven Day Yield, Caption [Text] Lowest Quarterly Return Annual Return 2008 Acquired Fund Fees and Expenses Maximum Sales Charge (Load) imposed on Purchases (as a percentage of offering price) Risk/Return: A Shares {28} A Shares Institutional {8} Institutional Money Market Seven Day Yield Highest Quarterly Return, Label Bar Chart, Year to Date Return Document Effective Date Amendment Flag 10 Years 10 Years 1 Year 1 Year Average Annual Return: Expense Example: Portfolio Turnover [Text Block] Operating Expenses Caption [Text] Expense [Heading] Barclays Capital U.S. Municipal Bond Index (reflects no deduction for expenses, fees or taxes) {5} Barclays Capital U.S. Municipal Bond Index (reflects no deduction for expenses, fees or taxes) Barclays Capital U.S. Aggregate Bond Index (reflects no deduction for expenses, fees or taxes) {4} Barclays Capital U.S. Aggregate Bond Index (reflects no deduction for expenses, fees or taxes) Investor Shares {35} Investor Shares Cash Management Fund {2} Cash Management Fund Cash Management Fund Total Annual Fund Operating Expenses Investor Shares {26} Investor Shares Investor Shares {23} Investor Shares Opportunistic Fund {10} Opportunistic Fund Opportunistic Fund Series Lowest Quarterly Return, Label Performance Past Does Not Indicate Future [Text] Performance Availability Website Address [Text] Annual Return 2001 Bar Chart Table: Expense Example, with Redemption, 5 Years 5 Years Performance Table Heading Investor Shares {32} Investor Shares Institutional Share {21} Institutional Share Intermediate Tax-Free Bond Fund {7} Intermediate Tax-Free Bond Fund Intermediate Tax-Free Bond Fund Bond Fund {6} Bond Fund Bond Fund Year to Date Return, Label Risk Money Market Fund [Text] Annual Return 2007 Performance Table Closing [Text Block] Expense Example Narrative [Text Block] Return Before Taxes {1} Return Before Taxes Performance Measure [Axis] A Share {19} A Share Administrative {1} Administrative U.S. Large Cap Equity Fund {9} U.S. Large Cap Equity Fund U.S. Large Cap Equity Fund Total Other Expenses Other Expenses Distribution/Service (12b-1) Fees Strategy Narrative [Text Block] Objective [Heading] Investor Share {17} Investor Share Highest Quarterly Return, Date Bar Chart Closing [Text Block] Risk Narrative [Text Block] Administrative Shares {3} Administrative Shares Short Term Income Fund {4} Short Term Income Fund Short Term Income Fund Bar Chart, Year to Date Return, Date Document Type Annual Return 2004 Performance [Table] Bar Chart Footnotes [Text Block] Bar Chart [Heading] Expense Example [Heading] Risk/Return [Heading] Russell 1000® Index (reflects no deduction for expenses, fees or taxes) Russell 1000® Index (reflects no deduction for expenses, fees or taxes) Select Shares {11} Select Shares Service Shares {5} Service Shares Money Market Seven Day Yield Phone Lowest Quarterly Return, Date Central Index Key Annual Return 2010 Total Annual Fund Operating Expenses After Fee Waiver Investor Shares {29} Investor Shares Select {12} Select Service Shares {6} Service Shares Annual Return 2006 Expense Example, with Redemption, 3 Years 3 Years Performance Narrative [Text Block] Expense Example, No Redemption [Table] Annual Fund Operating Expenses [Table] Before Taxes Institutional Shares {36} Institutional Shares Service {4} Service Administrative {2} Administrative Balanced Fund {8} Balanced Fund Balanced Fund Money Market Seven Day Yield Column [Text] Document Creation Date Less Fee Waivers Shareholder Servicing Fees Management Fees BofA Merrill Lynch 1-5 Year U.S. Corporate/Government Index (reflects no deduction for expenses, fees or taxes) {2} BofA Merrill Lynch 1-5 Year U.S. Corporate/Government Index (reflects no deduction for expenses, fees or taxes) After Taxes on Distributions and Sales A Shares {34} A Shares Institutional Shares {27} Institutional Shares Institutional Shares {24} Institutional Shares Share Class [Axis] Series [Axis] Performance Availability Phone [Text] Portfolio Turnover, Rate Document Period End Date Risk/Return Detail [Table] Annual Return 2003 Expense Example, With Redemption [Table] Expense Narrative [Text Block] Barclays Capital U.S. Intermediate Aggregate Bond Index (reflects no deduction for expenses, fees or taxes) {3} Barclays Capital U.S. Intermediate Aggregate Bond Index (reflects no deduction for expenses, fees or taxes) Institutional Shares {33} Institutional Shares A Shares {25} A Shares A Shares {22} A Shares Institutional {7} Institutional Registrant Name Since Inception 5 Years 5 Years Annual Return 2009 Bar Chart and Performance Table [Heading] Shareholder Fees [Table] A Shares {31} A Shares Investor Share {20} Investor Share Select {10} Select Highest Quarterly Return Annual Return 2005 Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of original purchase price or redemption proceeds, for shares held less than 12 months) Shareholder Fees: Bar Chart [Table] Strategy [Heading] Institutional Share {18} Institutional Share Intermediate Bond Fund {5} Intermediate Bond Fund Intermediate Bond Fund Prospectus Date Market Index Performance [Table] Risk [Heading] Objective, Primary [Text Block] A Share {16} A Share Risk Not Insured Depository Institution [Text] Risk Lose Money [Text] Expense Example, with Redemption, 10 Years 10 Years Operating Expenses: Portfolio Turnover [Heading] Shareholder Fees Caption [Text] After Taxes on Distributions Premier Shares {15} Premier Shares Premier {13} Premier Share Classes Tax-Free Money Market Fund {3} Tax-Free Money Market Fund Tax-Free Money Market Fund Annual Return 2002 Expense Example, with Redemption, 1 Year 1 Year Institutional Shares {30} Institutional Shares Premier {14} Premier Institutional Shares {9} Institutional Shares U.S. Treasury Fund {1} U.S. Treasury Fund U.S. Treasury Fund Index No Deduction for Fees Expenses Taxes Performance Information Illustrates Variability of Returns Strategy Portfolio Concentration Bar Chart Does Not Reflect Sales Loads Bar Chart Does Not Reflect Sales Loads Objective Secondary [TextBlock] Objective Secondary [TextBlock]