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Fair value measurement - Outstanding Debt (Details) - Senior Notes - Level 2 - USD ($) $ in Millions | Feb. 03, 2024 | Jul. 29, 2023
--- | --- | ---
Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Outstanding debt | $ 147.7 | $ 147.5
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Outstanding debt | $ 146.3 | $ 145.1

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