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Segment Information - Concentration Risk (Details) - Customer Concentration Risk - Significant Customer
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 27, 2019
Oct. 27, 2019
Jan. 27, 2019
Sales Revenue      
Revenue, Major Customer [Line Items]      
Concentration risk (as percent) 10.00% 11.00%  
Accounts Receivable      
Revenue, Major Customer [Line Items]      
Concentration risk (as percent)   24.00% 19.00%