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Income Taxes - Effective Income Tax Rate - Narrative (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 29, 2017
Jan. 31, 2016
Jan. 29, 2017
Jan. 31, 2016
Income Tax Disclosure [Abstract]        
Income taxes $ 643 $ 2,317 $ 6,560 $ 7,398
Effective income tax rate     28.90% 35.70%