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Stock-Based Compensation - Summary of stock-based compensation expense recognized (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Stock-based compensation included in indirect costs and selling expenses:    
Total stock-based compensation related to RSUs included in indirect costs and selling expense $ 3,638 $ 2,620
Income tax benefit recognized for stock-based compensation expense $ 1,415 $ 1,016