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Accounts receivable, net - Past Due Status (Details) - USD ($)
$ in Millions
Jan. 30, 2021
Aug. 01, 2020
Financing Receivable, Past Due [Line Items]    
Total at amortized cost $ 97.5 $ 24.3
Current    
Financing Receivable, Past Due [Line Items]    
Total at amortized cost 81.3 23.2
1 - 30 days past due    
Financing Receivable, Past Due [Line Items]    
Total at amortized cost 9.1 1.0
31 - 60 days past due    
Financing Receivable, Past Due [Line Items]    
Total at amortized cost 2.6 0.1
61 - 90 days past due    
Financing Receivable, Past Due [Line Items]    
Total at amortized cost 1.7 0.0
Greater than 90 days past due    
Financing Receivable, Past Due [Line Items]    
Total at amortized cost $ 2.8 $ 0.0