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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
Income Taxes [Line Items]
Provision (benefit) for income taxes	$ 656	$ (4,963)	$ 1,275	$ (3,899)
Provisions for income taxes deferred			1,088	(4,057)
Provision for income taxes current			183	167
BBI Acquisition [Member]
Income Taxes [Line Items]
Deferred tax benefit due to reduction in valuation allowance		(5,242)		(5,242)
Deferred tax liability recorded through goodwill		5,242		5,242
Provision (benefit) for income taxes				(3,899)
Provisions for income taxes deferred			$ 1,092	$ 1,176

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred tax liability attributable to taxable temporary differences from goodwill.