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Concentration of Credit Risk - Narratives (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 27, 2019
USD ($)
customer
Jul. 28, 2018
USD ($)
Jul. 27, 2019
USD ($)
customer
Rate
Jul. 28, 2018
USD ($)
Rate
Jan. 26, 2019
USD ($)
Concentration Risk          
Number of customers classified as highly concentrated | customer 5   5    
Concentration risk percentage 100.00% 100.00% 100.00% 100.00%  
Accounts receivable, net $ 796,908   $ 796,908   $ 625,258
Revenue from Contract with Customer, Excluding Assessed Tax $ 884,221 $ 799,470 $ 1,717,964 $ 1,530,844  
Sales Revenue, Services, Net | Customer Concentration Risk          
Concentration Risk          
Concentration risk percentage     10.00%    
Sales Revenue, Services, Net | Customer Concentration Risk | Five Unnamed Customers          
Concentration Risk          
Concentration risk percentage | Rate     79.40% 78.30%