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Revenue Recognition (Detail Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Change In Accounting Estimate [Line Items]        
Income before income taxes $ 92,842 $ 77,306 $ 183,556 $ 133,363
Diluted earnings per share $ 2.71 $ 5.66 $ 5.81 $ 7.33
EAC Adjustments        
Change In Accounting Estimate [Line Items]        
Income before income taxes $ 4,200   $ 10,600  
Diluted earnings per share $ 0.12   $ 0.31