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Changes in Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2011
Income Taxes [Line Items]
Unrecognized tax benefits, beginning of year		$ 3,532
Settlement with tax authority		(1,473)
Additions based on tax positions related to the current year	1,454
Additions based on tax positions related to prior years	569	72
Reductions due to lapse of statute of limitations		(2,131)
Unrecognized tax benefits, end of year	$ 2,023

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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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The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

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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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