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Stock-Based Compensation - Expense and Related Tax Benefits Recognized (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Stock-based compensation included in indirect costs and selling expense:    
Stock-based compensation related to RSUs included in indirect costs and selling expense $ 5,698 $ 6,351
Income tax benefit recognized for stock-based compensation expense $ 749 $ 1,587