Discontinued Operations - Calculation of Loss on Disposal of Discontinued Operations (Detail) - USD ($) $ in Thousands		12 Months Ended
	Jun. 04, 2014	Apr. 30, 2015	Apr. 30, 2014
Discontinued Operations and Disposal Groups [Abstract]
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)	$ (9,474)
Income tax benefit		(282)	(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)	$ (9,192)