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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2016
May 02, 2015
Apr. 26, 2014
Reconciliation of Changes in Unrecognized Tax Benefits      
Unrecognized tax benefits, beginning balance $ 2,891 $ 494 $ 379
Gross increases related to prior period tax positions 137 6 16
Gross decreases related to prior period tax positions 0 0 0
Gross increases related to current period tax positions 8 2,496 99
Lapse of statute of limitations (20) (105) 0
Unrecognized tax benefits, ending balance $ 3,016 $ 2,891 $ 494