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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, 2013	Jan. 31, 2012
Business Combinations [Abstract]
Total revenues	$ 5,471,267	$ 5,344,441
Net income	$ 88,206	$ 95,960
Net income per common share, Basic	$ 2.30	$ 2.52
Earnings per common share, Diluted	$ 2.28	$ 2.50

X

- 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

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-Name Accounting Standards Codification

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