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Income Taxes - Effective Income Tax Rate - Narrative (Detail) - USD ($)
$ in Thousands
3 Months Ended
Aug. 02, 2015
Aug. 03, 2014
Income Taxes [Line Items]    
Income taxes $ 2,707 $ 2,115
Income tax rate 36.50% 38.70%
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 income tax effects of undistributed earnings from foreign subsidiaries 5.00% 3.00%
Increase in income tax rate from an increase in unrecognized tax benefits 3.00% 5.00%
Increase in income tax rate for other miscellaneous items 0.50% 2.70%
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%)
Increase in income tax rate from income tax effects of undistributed earnings from foreign subsidiaries 5.00% 3.00%