Income Taxes - Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 28, 2013		Apr. 29, 2012
deferred tax assets:
accounts receivable	$ 376		$ 301
inventories	1,689		1,738
compensation	3,049		2,107
liabilities and other	700		523
alternative minimum tax credit	1,320		1,320
property, plant and equipment	758	[1]	1,001	[1]
loss carryforwards - U.S.	19,842		23,472
loss carryforwards - foreign	241		115
unrecognized tax benefits - U.S.	(8,976)		(8,298)
valuation allowances	(963)		(12,797)
total deferred tax assets	18,036		9,482
deferred tax liabilities:
undistributed earnings on foreign subsidiaries	(7,011)
property, plant and equipment	(4,653)	[2]	(3,715)	[2]
other	(985)		(800)
total deferred tax liabilities	(12,649)		(4,515)
net deferred tax asset	$ 5,387		$ 4,967

[1] Pertains to the company's operations located in China.

[2] Pertains to the company's operations located in the U.S. and Canada.