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Schedule of Earnings Per Share (Detail)
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]      
Weighted-Average Shares of Common Stock Outstanding 49,090,750 46,622,646 44,224,924
Assumed Exercise of Outstanding Dilutive Options 1,574,491 1,984,563 800,748
Less Shares Repurchased from Proceeds of Assumed Exercised Options (1,032,359) (1,568,604) (652,046)
Restricted Stock Units 306,283 301,845 142,355
Weighted-Average Common Stock and Dilutive Securities Outstanding 49,939,165 47,340,450 44,515,981