Discontinued Operations - Loss on Disposal (Details) - USD ($) $ in Thousands		12 Months Ended
	Jun. 04, 2014	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
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)
Income tax benefit				(282)
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Including Previously Recognized				(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	$ 0	$ (1,537)