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Stock-Based Compensation - Expense and Related Tax Benefits Recognized (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Stock-based compensation included in indirect costs and selling expense:        
Stock-based compensation related to RSUs included in indirect costs and selling expense $ 6,349 $ 6,038 $ 12,047 $ 12,389
Income tax benefit recognized for stock-based compensation expense $ 1,657 $ 1,985 $ 2,373 $ 4,074