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Acquisitions (Pro Forma Information Of Consolidated Results Of Operations) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
9 Months Ended
Jan. 31, 2012
Jan. 31, 2011
Acquisitions [Abstract]    
Total revenues $ 5,262,880 $ 4,193,013
Net earnings $ 94,506 $ 74,022
Earnings per common share, Basic $ 2.48 $ 1.69
Earnings per common share, Diluted $ 2.46 $ 1.68