Accounts Receivable (Detail) - USD ($) $ in Thousands	Jul. 31, 2016	May 01, 2016		Aug. 02, 2015	May 03, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customers	$ 24,669	$ 25,531		$ 27,428
Accounts receivable, net	22,690	23,481	[1]	25,707
Allowance for doubtful accounts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Valuation allowance, balance	(850)	(1,088)		(935)	$ (851)
Reserve for returns and allowances and discounts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Valuation allowance, balance	$ (1,129)	$ (962)		$ (786)	$ (738)

[1] Derived from audited financial statements.