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Organization and principal accounting policies - Additional information (Details)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 29, 2021
USD ($)
May 01, 2021
USD ($)
Jul. 31, 2021
USD ($)
segment
Aug. 01, 2020
USD ($)
Business Acquisition [Line Items]        
Number of reportable segments (segment) | segment     3  
Acquisition of Rocksbox Inc., net of cash acquired     $ 14.4 $ 0.0
Rocksbox        
Business Acquisition [Line Items]        
Acquisition of Rocksbox Inc., net of cash acquired $ 14.4      
Acquisition and integration related costs   $ 1.1    
Minimum        
Business Acquisition [Line Items]        
Seasonal revenues, fourth quarter sales, percent     35.00%  
Maximum        
Business Acquisition [Line Items]        
Seasonal revenues, fourth quarter sales, percent     40.00%