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Income Taxes - Effective Income Tax Rate - Narrative (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 31, 2016
Feb. 01, 2015
Jan. 31, 2016
Feb. 01, 2015
Income Tax Disclosure [Abstract]        
Income taxes $ 2,317 $ 2,110 $ 7,398 $ 6,113
Effective income tax rate     35.70% 37.60%