Segment Information - International net sales (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 30, 2017	Jan. 29, 2017	Oct. 30, 2016	Jul. 31, 2016	May 01, 2016	Jan. 31, 2016	Nov. 01, 2015	Aug. 02, 2015	Apr. 30, 2017	May 01, 2016	May 03, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
net sales	$ 77,350	$ 76,169	$ 75,343	$ 80,682	$ 77,253	$ 78,466	$ 76,956	$ 80,185	$ 309,544	$ 312,860	$ 310,166
Mexico [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
net sales									22,300	24,200	24,100
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
net sales									$ 26,600	$ 23,100	$ 26,500