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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 27, 2019
Apr. 28, 2018
Apr. 29, 2017
Reconciliation of the beginning and ending balance of unrecognized tax benefits      
Balance at the beginning of the period $ 1,014 $ 620 $ 1,821
Additions:      
Positions taken during the current year 187 464 148
Positions taken during the prior year   25  
Reductions:      
Positions taken during the prior year (36)   (4)
Decreases related to settlements with taxing authorities     (27)
Reductions resulting from the lapse of the statue of limitations (96) (95) (1,318)
Balance at the end of the period 1,069 1,014 620
Interest and penalties accrued 300 300  
Recognition of unrecognized tax benefit that would decrease the effective tax rate 900    
Expected decrease in unrecognized tax benefits within the next 12 months 1,000    
Cash paid for taxes (net of refunds received) $ 23,800 $ 37,100 $ 33,700