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Income Taxes - Unrecognized Tax Benefit (Detail) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2017
May 01, 2016
May 03, 2015
Income Tax Disclosure [Abstract]      
beginning balance $ 14,897 $ 14,141 $ 13,740
increases from prior period tax positions 854 454 588
decreases from prior period tax positions (3,506) [1] (77) (187)
increases from current period tax positions   379  
ending balance $ 12,245 $ 14,897 $ 14,141
[1] Amount includes a reduction to unrecognized tax benefits of $3,431 resulting from a lapse of the applicable statute of limitations.