Accounts Receivable (Detail) - USD ($) $ in Thousands	Aug. 02, 2015	May. 03, 2015		Aug. 03, 2014	Apr. 27, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customers	$ 27,428	$ 30,338		$ 25,212
Accounts receivable, net	25,707	28,749	[1]	24,239
Allowance for doubtful accounts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Valuation allowance, balance	(935)	(851)		(438)	$ (573)
Reserve for returns and allowances and discounts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Valuation allowance, balance	$ (786)	$ (738)		$ (535)	$ (479)

[1] Derived from audited financial statements.