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Goodwill and intangibles - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2020
May 02, 2020
Nov. 02, 2019
Aug. 03, 2019
Oct. 31, 2020
Nov. 02, 2019
Feb. 01, 2020
Finite-Lived Intangible Assets [Line Items]              
Goodwill and intangible asset impairment   $ 94.0          
Goodwill impairment $ 0.0   $ 0.0 $ 47.7 $ 10.7 $ 47.7  
Indefinite-lived intangible asset impairment $ 0.0   $ 0.0   83.3 $ 0.0  
Zales              
Finite-Lived Intangible Assets [Line Items]              
Goodwill impairment       35.2      
R2Net Inc.              
Finite-Lived Intangible Assets [Line Items]              
Goodwill impairment       $ 12.5      
North America              
Finite-Lived Intangible Assets [Line Items]              
Goodwill impairment   10.7     $ 10.7   $ 47.7
Indefinite-lived intangible asset impairment   $ 83.3