Segment Information - International net sales (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	May. 03, 2015	Feb. 01, 2015	Nov. 02, 2014	Aug. 03, 2014	Apr. 27, 2014	Jan. 26, 2014	Oct. 27, 2013	Jul. 28, 2013	May. 03, 2015	Apr. 27, 2014	Apr. 28, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
net sales	$ 78,846	$ 81,269	$ 73,991	$ 76,060	$ 74,043	$ 72,389	$ 70,589	$ 70,141	$ 310,166	$ 287,162	$ 268,814
Mexico [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
net sales									24,100	9,300	3,200
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
net sales									$ 26,500	$ 32,200	$ 42,100