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Concentration of Credit Risk - Narratives (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 26, 2019
USD ($)
customer
Oct. 27, 2018
USD ($)
Oct. 26, 2019
USD ($)
customer
Rate
Oct. 27, 2018
USD ($)
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 $ 919,496   $ 919,496   $ 625,258
Revenue from Contract with Customer, Excluding Assessed Tax $ 884,115 $ 848,237 $ 2,602,079 $ 2,379,081  
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     78.70% 78.30%