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Schedule of Earnings Per Share (Detail) - shares
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]      
Weighted-Average Shares of Common Stock Outstanding 49,471,157 49,604,249 49,090,750
Assumed Exercise of Outstanding Dilutive Options 1,146,807 1,350,556 1,574,491
Less Shares Repurchased from Proceeds of Assumed Exercised Options (768,886) (868,636) (1,032,359)
Restricted Stock Units 221,751 286,074 306,283
Weighted-Average Common Stock and Dilutive Securities Outstanding 50,070,829 50,372,243 49,939,165