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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, 2013
Jan. 31, 2013
Oct. 31, 2012
Jul. 31, 2012
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2011
Jul. 31, 2011
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Basic [Abstract]                      
Net earnings $ 23,272 $ 15,463 $ 32,859 $ 39,031 $ 23,069 $ 16,699 $ 37,632 $ 39,391 $ 110,625 $ 116,791 $ 94,623
Weighted average shares outstanding - basic                 38,297,083 38,068,001 42,284,664
Basic earnings per common share $ 0.61 $ 0.40 $ 0.86 $ 1.02 $ 0.61 $ 0.44 $ 0.99 $ 1.04 $ 2.89 $ 3.07 $ 2.24
Diluted [Abstract]                      
Net earnings $ 23,272 $ 15,463 $ 32,859 $ 39,031 $ 23,069 $ 16,699 $ 37,632 $ 39,391 $ 110,625 $ 116,791 $ 94,623
Weighted average shares outstanding - basic                 38,297,083 38,068,001 42,284,664
Plus effect of stock options and restricted stock units                 322,993 323,703 281,913
Weighted-average shares outstanding - diluted                 38,620,076 38,391,704 42,566,577
Diluted earnings per common share $ 0.60 $ 0.40 $ 0.85 $ 1.01 $ 0.60 $ 0.43 $ 0.98 $ 1.03 $ 2.86 $ 3.04 $ 2.22
Antidilutive shares                   439,000