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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, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Stock-based compensation included in indirect costs and selling expenses:        
Restricted stock and restricted stock unit (RSU) expense. $ 3,105 $ 349 $ 8,849 $ 5,830
Non-qualified stock option and stock settled stock appreciation right (SSAR) expense    144 41 564
Total stock-based compensation expense 3,105 493 8,890 6,394
Income tax benefit recognized for stock-based compensation expense $ 1,146 $ 201 $ 3,378 $ 2,417