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Income Taxes (Changes In Unrecognized Tax Benefits) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2011	Apr. 30, 2010
Income Taxes [Abstract]
Unrecognized tax benefits, beginning of year	$ 3,532	$ 13,392
Settlement with tax authority	(1,473)
Estimated interest for the year	72	469
Recognized tax benefits	(2,131)	(10,329)
Unrecognized tax benefits, end of year		$ 3,532

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities.

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This element represents interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations.

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