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Accounts Receivable Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 27, 2019
Apr. 28, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for doubtful accounts at beginning of period $ 17,702 $ 998
Provision for bad debt (recovery) (10,311) (24)
Amounts (charged) recovered against the allowance (6,019) 2
Allowance for doubtful accounts at end of period 1,372 $ 976
Windstream Corporation [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for doubtful accounts at beginning of period 16,800  
Provision for bad debt (recovery) $ 10,300