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Unaudited Pro Forma Results (Detail) - Fairborn Acquisition [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Business Acquisition [Line Items]    
Revenue $ 1,280,511 $ 1,218,254
Net Income $ 205,343 $ 156,465
Earnings per share – basis $ 4.28 $ 3.16
Earnings per share - diluted $ 4.25 $ 3.12