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Fair value measurement - Fair Value of Assets and Liabilities (Details) - USD ($) $ in Millions | May 03, 2025 | Feb. 01, 2025 | May 04, 2024
--- | --- | --- | ---
Carrying Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | $ 5.3 | $ 5.6 | $ 6.3
Liabilities | (0.6) | (0.7) | (0.3)
US Treasury securities | Carrying Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 5.3 | 5.2 | 5.2
Foreign currency contracts | Carrying Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.4 | 0.1
Liabilities | (0.6) | (0.7) | (0.3)
US government agency securities | Carrying Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.0 | 0.5
Corporate bonds and notes | Carrying Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.0 | 0.5
Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 5.3 | 5.2 | 5.2
Liabilities | 0.0 | 0.0 | 0.0
Level 1 | US Treasury securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 5.3 | 5.2 | 5.2
Level 1 | Foreign currency contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.0 | 0.0
Liabilities | 0.0 | 0.0 | 0.0
Level 1 | US government agency securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.0 | 0.0
Level 1 | Corporate bonds and notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.0 | 0.0
Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.4 | 1.1
Liabilities | (0.6) | (0.7) | (0.3)
Level 2 | US Treasury securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.0 | 0.0
Level 2 | Foreign currency contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.4 | 0.1
Liabilities | (0.6) | (0.7) | (0.3)
Level 2 | US government agency securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.0 | 0.5
Level 2 | Corporate bonds and notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | $ 0.0 | $ 0.0 | $ 0.5

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