Calculation of Loss on Disposal of Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended	9 Months Ended	12 Months Ended
	Jun. 04, 2014	Jan. 31, 2015	Apr. 30, 2014	Jul. 02, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash consideration	$ 30,000	$ 30,000
Basis in net assets as of July 2, 2014				39,972
Costs incurred directly attributable to the transaction		1,039
Loss before income taxes		(11,011)
Income tax benefit		(282)
Loss on disposal of discontinued operations, net of taxes		(10,729)
Loss on disposal of discontinued operations, net of taxes, previously recognized			9,192
Loss on disposal of discontinued operations, net of tax, recognized in current period		$ (1,537)