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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 |

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