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Accrued Insurance Claims (Details) - USD ($)
$ in Thousands
Jan. 26, 2019
Jan. 27, 2018
Accrued Insurance Claims [Abstract]    
Accrued insurance claims - current $ 39,961 $ 53,890
Accrued insurance claims - non-current 68,315 59,385
Total accrued insurance claims 108,276 113,275
Insurance recoveries/receivables:    
Current (included in Other current assets) 0 13,701
Non-current (included in Other assets) 13,684 6,722
Insurance Settlements Receivable $ 13,684 $ 20,423