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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 28, 2018
Apr. 29, 2017
Income Tax Disclosure [Abstract]    
Unrecognized Tax Benefits that Would Impact Effective Tax Rate $ 2,569  
Reconciliation of Changes in Unrecognized Tax Benefits    
Unrecognized tax benefits, beginning balance 3,113 $ 3,016
Gross increases related to prior period tax positions 82 235
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions 30 0
Gross increases related to current period tax positions 152 0
Lapse of statute of limitations (139) (138)
Unrecognized tax benefits, ending balance $ 3,178 $ 3,113