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Fair value measurement - Outstanding Debt (Details) - Senior Notes - Level 2 - USD ($)
$ in Millions
Apr. 29, 2023
Jan. 28, 2023
Apr. 30, 2022
Carrying Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Outstanding debt $ 147.5 $ 147.4 $ 147.1
Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Outstanding debt $ 144.3 $ 144.9 $ 147.2