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Accounts Receivable - Narratives (Details) - USD ($)
$ in Thousands
Jan. 25, 2020
Jan. 26, 2019
Jan. 27, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Contract assets, net $ 236,673 $ 200,724  
Allowance for recievables $ 4,582 17,702 $ 998
Windstream      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts Receivable, Gross, Noncurrent   24,800  
Allowance for recievables   $ 16,800