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Fair value measurement - Outstanding Debt (Details) - Senior Notes - Level 2 - USD ($) $ in Millions | Jan. 28, 2023 | Jan. 29, 2022
--- | --- | ---
Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Outstanding debt | $ 147.4 | $ 147.1
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Outstanding debt | $ 144.9 | $ 150.0

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