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Stock-Based Compensation (Unrecognized Compensation) (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation cost related to unvested stock-based compensation agreements $ 34,585us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Unrecognized compensation cost, amortization period 4 years 3 months
EIP | Stock options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation cost related to unvested stock-based compensation agreements 5,862us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= bah_AmendedAndRestatedEquityIncentivePlanMember
Unrecognized compensation cost, amortization period 3 years 0 months 9 days
Annual Incentive Plan | Restricted stock | Common stock, Class A  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation cost related to unvested stock-based compensation agreements $ 28,723us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= bah_AnnualIncentivePlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Unrecognized compensation cost, amortization period 2 years 10 months 23 days