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Acquisitions (Pro Forma Information Of Consolidated Results Of Operations) (Details) (USD $) In Thousands, except Per Share data	3 Months Ended
	Jul. 31, 2011	Jul. 31, 2010
Acquisitions
Total revenues	$ 1,897,203	$ 1,391,626
Net earnings	$ 39,918	$ 38,204
Earnings per share, Basic	$ 1.05	$ 0.75
Earnings per share, Diluted	$ 1.04	$ 0.75

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- 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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-Publisher FASB
-Name Accounting Standards Codification
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=6909870&loc=d3e1392-128463

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-Number 141
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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The pro forma net Income or Loss for the 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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