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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 6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Schedule Of Earnings Per Share Basic And Diluted [Line Items]        
Net Income available to common shareholders (A) $ 60,907 $ 54,172 $ 104,580 $ 84,255
Weighted average outstanding shares of common stock, basic (B) 49,582,086 49,274,816 49,581,707 49,253,409
Dilutive effect of options and restricted stock awards and units 230,841 448,303 219,607 395,983
Weighted average common stock and equivalents (C) 49,812,927 49,723,119 49,801,314 49,649,392
Earnings per share, basic (A/B) $ 1.23 $ 1.10 $ 2.11 $ 1.71
Earnings per share, diluted (A/C) $ 1.22 $ 1.09 $ 2.10 $ 1.70
Antidilutive incremental options and restricted stock awards and units 27,138 2,854 27,138 2,854