Discontinued Operations - Summary of Results of Operations Under Discontinued Operation Activities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Aug. 01, 2015	Jul. 26, 2014
Discontinued Operations and Disposal Groups [Abstract]
Net sales	$ 130,811	$ 120,573
Cost of sales	82,873	74,965
Gross profit	47,938	45,608
Operating expenses	32,039	26,850
Operating income	15,899	18,758
Other income and expense	(90)	132
Income before taxes	15,809	18,890
Income taxes	6,417	6,926
Net income from discontinued operations	$ 9,392	$ 11,964