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Fair value measurement - Outstanding Debt (Details) - Senior Notes - Level 2 - USD ($)
$ in Millions
Feb. 03, 2024
Jan. 28, 2023
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Outstanding debt $ 147.7 $ 147.4
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Outstanding debt $ 146.3 $ 144.9