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Stock-Based Compensation - Summary of stock-based compensation expense recognized (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Stock-based compensation included in indirect costs and selling expenses:        
Restricted stock and restricted stock unit (RSU) expense $ 3,857us-gaap_RestrictedStockExpense $ 3,105us-gaap_RestrictedStockExpense $ 10,051us-gaap_RestrictedStockExpense $ 8,849us-gaap_RestrictedStockExpense
Non-qualified stock option and stock settled stock appreciation right (SSAR) expense          41us-gaap_StockOptionPlanExpense
Total stock-based compensation expense 3,857us-gaap_AllocatedShareBasedCompensationExpense 3,105us-gaap_AllocatedShareBasedCompensationExpense 10,051us-gaap_AllocatedShareBasedCompensationExpense 8,890us-gaap_AllocatedShareBasedCompensationExpense
Income tax benefit recognized for stock-based compensation expense $ 1,378us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense $ 1,146us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense $ 3,737us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense $ 3,378us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense