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Comprehensive Income (Schedule Of Comprehensive Income) (Details) (USD $) In Thousands	3 Months Ended
	Jul. 31, 2011	Jul. 31, 2010
Comprehensive Income
Net income	$ 15,411	$ 10,904
Foreign currency translation adjustments	(827)	(3,784)
Unrealized gains (losses) on marketable securities, net of taxes	53	(1)
Comprehensive income (loss)	$ 14,637	$ 7,119

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The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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