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Income Taxes - Schedule of Reconciliation of Gross Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013
Income Tax Disclosure [Abstract]
Unrecognized tax benefits at beginning of period	$ 3,879	$ 4,447
Gross increases for tax positions of prior years	22	543
Gross decreases for tax positions of prior years	(229)	(26)
Reductions resulting from lapse of statute of limitations	(611)	(655)
Settlements		(430)
Unrecognized tax benefits at end of period	$ 3,061	$ 3,879

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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