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Unaudited Pro Forma Results (Detail) - Fairborn Acquisition [Member] - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Business Acquisition [Line Items]    
Revenues $ 356,846 $ 677,532
Net Income $ 63,471 $ 111,336
Earnings per share – basis $ 1.33 $ 2.32
Earnings per share - diluted $ 1.32 $ 2.30