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Income Taxes - Effective Income Tax Rate - Narrative (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 28, 2018
Jan. 29, 2017
Jan. 28, 2018
Jan. 29, 2017
Income Tax Disclosure [Abstract]        
Income taxes $ 8,208 $ 643 $ 11,956 $ 6,560
Effective income tax rate     58.60% 28.90%