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Acquisitions (Pro Forma Information Of Consolidated Results Of Operations) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Oct. 31, 2011	Oct. 31, 2010
Acquisitions [Abstract]
Total revenues	$ 3,684,634	$ 2,781,579
Net earnings	$ 77,801	$ 61,161
Earnings per share, Basic	$ 2.05	$ 1.31
Earnings per share, Diluted	$ 2.03	$ 1.30

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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.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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