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Income Taxes - Effective Income Tax Rate - Narrative (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Nov. 01, 2015
Nov. 02, 2014
Nov. 01, 2015
Nov. 02, 2014
Income Tax Disclosure [Abstract]        
Income taxes $ 2,373 $ 1,889 $ 5,081 $ 4,003
Effective income tax rate     37.50% 38.70%