Segment Information - International net sales (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	May 01, 2016	Jan. 31, 2016	Nov. 01, 2015	Aug. 02, 2015	May 03, 2015	Feb. 01, 2015	Nov. 02, 2014	Aug. 03, 2014	May 01, 2016	May 03, 2015	Apr. 27, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
net sales	$ 77,253	$ 78,466	$ 76,956	$ 80,185	$ 78,846	$ 81,269	$ 73,991	$ 76,060	$ 312,860	$ 310,166	$ 287,162
Mexico [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
net sales									24,200	24,100	9,300
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
net sales									$ 23,100	$ 26,500	$ 32,200