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Unaudited Pro Forma Results (Detail) - Fairborn Acquisition [Member] - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
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Dec. 31, 2016 | Dec. 31, 2016
Business Acquisition [Line Items] |  |
Revenues | $ 321,378 | $ 998,910
Net Income | $ 58,294 | $ 169,631
Earnings per share – basic | $ 1.22 | $ 3.54
Earnings per share - diluted | $ 1.21 | $ 3.51

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