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Acquisitions (Pro Forma Information Of Consolidated Results Of Operations) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012
Acquisitions [Abstract]
Total revenues	$ 7,321,715	$ 7,119,777
Net earnings	$ 112,161	$ 119,729
Earnings per common share, Basic	$ 2.93	$ 3.15
Earnings per common share, Diluted	$ 2.90	$ 3.12

- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References+ Details

- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References+ Details