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Income Taxes - Effective Income Tax Rate - Narrative (Detail) (USD $)
3 Months Ended
Aug. 03, 2014
Jul. 28, 2013
Income Taxes [Line Items]    
Income taxes $ 2,115,000 $ 2,305,000
Income tax rate 38.70% 41.60%
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 5.00% 4.00%
Increase in income tax rate for stock-based compensation and other miscellaneous items 5.70% 4.60%
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   5.00%
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
   
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   5.00%
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