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Commitments and Contingencies - Litigation (Details) - USD ($)
$ in Thousands
Jan. 26, 2019
Apr. 28, 2018
Insurance Claims [Member]    
Loss Contingencies [Line Items]    
Loss Contingency, Estimate of Possible Loss   $ 1,904
Collectibility of Receivables [Member]    
Loss Contingencies [Line Items]    
Loss Contingency, Accrual, Current $ 2,224 $ 2,224