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Income Taxes - Effective Income Tax Rate - Narrative (Detail) (USD $)	3 Months Ended		6 Months Ended
	Nov. 02, 2014	Oct. 27, 2013	Nov. 02, 2014	Oct. 27, 2013
Income Taxes [Line Items]
Income taxes	$ 1,889,000	$ 1,718,000	$ 4,003,000	$ 4,023,000
Income tax rate			38.70%	38.90%
Statutory rate			34.00%	34.00%
Decrease in income tax rate from the lower statutory income tax rates in foreign jurisdictions compared with the U.S statutory income tax rate			(6.00%)	(6.00%)
Increase in income tax rate from an increase in unrecognized tax benefits			4.00%	4.00%
Increase in income tax rate for stock-based compensation and other miscellaneous items			6.70%	3.90%
Increase in income tax rate from adjustments to the state of North Carolina loss carryforwards for the decrease in future North Carolina corporate income tax rates				3.00%
Income tax expense related to the adjustments of the state of North Carolina loss carryforwards from the decrease in future North Carolina corporate income tax rates				273,000
Canada and China [Member]
Income Taxes [Line Items]
Decrease in income tax rate from the lower statutory income tax rates in foreign jurisdictions compared with the U.S statutory income tax rate			(6.00%)	(6.00%)
North Carolina [Member]
Income Taxes [Line Items]
Increase in income tax rate from adjustments to the state of North Carolina loss carryforwards for the decrease in future North Carolina corporate income tax rates				3.00%
Income tax expense related to the adjustments of the state of North Carolina loss carryforwards from the decrease in future North Carolina corporate income tax rates				$ 273,000

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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