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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 29, 2017
Apr. 30, 2016
Apr. 25, 2015
Reconciliation of the beginning and ending balance of unrecognized tax benefits      
Balance at the beginning of the period $ 1,821 $ 2,226 $ 2,972
Additions:      
Positions taken during the current year 148 87 94
Reductions:      
Positions taken during the prior year (4) (321) (702)
Decreases related to settlements with taxing authorities (27)   (25)
Reductions resulting from the lapse of the statue of limitations (1,318) (171) (113)
Balance at the end of the period 620 1,821 2,226
Interest and penalties accrued 200 200  
Recognition of unrecognized tax benefit that would decrease the effective tax rate 400    
Cash paid for taxes $ 33,700 $ 34,500 $ 34,400