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Accrued Insurance Claims (Details) - USD ($)
$ in Thousands
Apr. 28, 2018
Jan. 27, 2018
Accrued Insurance Claims [Abstract]    
Accrued insurance claims - current $ 40,182 $ 53,890
Accrued insurance claims - non-current 59,865 59,385
Total accrued insurance claims 100,047 113,275
Insurance recoveries/receivables:    
Current (included in Other current assets) 911 13,701
Non-current (included in Other assets) 5,576 6,722
Insurance Settlements Receivable $ 6,487 $ 20,423