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Stockholders' Equity (Employee Stock Purchase Plan) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 9 Months Ended 50 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock Repurchase Program, Authorized Amount 30.0us-gaap_StockRepurchaseProgramAuthorizedAmount1 30.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
Employee Stock Purchase Plan | Common stock, Class A    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares purchased by employees under the employee stock purchase plan 48,029us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 1,460,880us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember