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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 29, 2017
Apr. 30, 2016
May 02, 2015
Reconciliation of Changes in Unrecognized Tax Benefits      
Unrecognized tax benefits, beginning balance $ 3,016 $ 2,891 $ 494
Gross increases related to prior period tax positions 235 137 6
Gross increases related to current period tax positions 0 8 2,496
Lapse of statute of limitations (138) (20) (105)
Unrecognized tax benefits, ending balance $ 3,113 $ 3,016 $ 2,891