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Components of Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Schedule Of Earnings Per Share Basic And Diluted [Line Items]    
Net Income available to common shareholders (A) $ 43,673 $ 30,083
Weighted average outstanding shares of common stock, basic (B) 49,580,038 49,226,911
Dilutive effect of options and restricted stock awards and units 282,986 331,090
Weighted average common stock and equivalents (C) 49,863,024 49,558,001
Earnings per share, basic (A/B) $ 0.88 $ 0.61
Earnings per share, diluted (A/C) $ 0.88 $ 0.61
Antidilutive incremental options and restricted stock awards and units   17,755