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Subsequent events (Details) - USD ($)
12 Months Ended
Mar. 19, 2020
Feb. 01, 2020
Feb. 02, 2019
Feb. 03, 2018
Subsequent Event [Line Items]        
Proceeds from revolving credit facilities   $ 858,300,000 $ 787,000,000.0 $ 814,000,000.0
Cash and cash equivalents   374,500,000 $ 195,400,000  
Subsequent Event        
Subsequent Event [Line Items]        
Cash and cash equivalents $ 1,200,000,000      
Senior Asset-Based Credit Facility | Line of Credit | Revolving Credit Facility        
Subsequent Event [Line Items]        
Line of credit facility, remaining borrowing capacity   $ 1,200,000,000    
Senior Asset-Based Credit Facility | Line of Credit | Revolving Credit Facility | Subsequent Event        
Subsequent Event [Line Items]        
Proceeds from revolving credit facilities 900,000,000      
Line of credit facility, remaining borrowing capacity $ 292,000,000      
Debt covenant, fixed charge covenant ratio threshold, percentage 10.00%      
Debt covenant, fixed charge covenant ratio threshold $ 100,000,000      
Debt instrument, collateral amount $ 1,400,000,000