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Stock-Based Compensation - Summary of stock-based compensation expense recognized (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2016 | Mar. 31, 2015
Stock-based compensation included in indirect costs and selling expenses: |  |  |  |
Total stock-based compensation related to RSUs included in indirect costs and selling expense | $ 4,856 | $ 3,857 | $ 13,329 | $ 10,051
Income tax benefit recognized for stock-based compensation expense | $ 1,719 | $ 1,378 | $ 4,897 | $ 3,737

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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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