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Earnings Per Share - Components of Denominator for Basic Earnings Per Common Share and Diluted Earnings Per Common Share (Parenthetical) (Detail)
3 Months Ended 9 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share [Abstract]        
Options excluded from the computation of diluted earnings per share 99,000 727,000 214,000 735,000