Discontinued Operations - Loss on Disposal (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Jun. 04, 2014	Jul. 31, 2013	Apr. 30, 2016	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)
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Including Previously Recognized		$ (9,192)		(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			$ 0	$ (1,537)	(9,192)
Estimated cash proceeds					30,500
Estimated costs incurred directly attributable to the transaction					$ 658