Discontinued Operations - Summary of Results of Operations Under Discontinued Operation Activities (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 30, 2016	Jan. 24, 2015	Jan. 30, 2016	Jan. 24, 2015
Discontinued Operations and Disposal Groups [Abstract]
Net sales	$ 0	$ 104,684	$ 168,504	$ 350,362
Cost of sales	0	64,567	107,359	218,102
Operating expenses	0	26,738	54,954	81,042
Loss (gain) on sale	1,192	0	(24,328)	0
Other expense (income)	0	224	150	109
Income (loss) before taxes	(1,192)	13,155	30,369	51,109
Income taxes	(442)	4,913	28,869	18,990
Net (loss) income from discontinued operations	$ (750)	$ 8,242	$ 1,500	$ 32,119