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Earnings Per Common Share (Schedule Of Earnings Per Share, Basic And Diluted) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2011
Jul. 31, 2011
Apr. 30, 2011
Jan. 31, 2011
Oct. 31, 2010
Jul. 31, 2010
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2010
Basic [Abstract]                      
Net earnings $ 23,069 $ 16,699 $ 37,632 $ 39,391 $ 22,770 $ 12,875 $ 21,692 $ 37,286 $ 116,791 $ 94,623 $ 116,962
Weighted average shares outstanding - basic                 38,068,001 42,284,664 50,899,370
Basic earnings per common share $ 0.61 $ 0.44 $ 0.99 $ 1.04 $ 0.60 $ 0.34 $ 0.51 $ 0.73 $ 3.07 $ 2.24 $ 2.30
Diluted [Abstract]                      
Net earnings $ 23,069 $ 16,699 $ 37,632 $ 39,391 $ 22,770 $ 12,875 $ 21,692 $ 37,286 $ 116,791 $ 94,623 $ 116,962
Weighted average shares outstanding - basic                 38,068,001 42,284,664 50,899,370
Plus effect of stock options and restricted stock units                 323,703 281,913 153,803
Weighted-average shares outstanding - diluted                 38,391,704 42,566,577 51,053,173
Diluted earnings per common share $ 0.60 $ 0.43 $ 0.98 $ 1.03 $ 0.60 $ 0.34 $ 0.51 $ 0.73 $ 3.04 $ 2.22 $ 2.29
Antidilutive shares                 439,000   356,000