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Fair value measurement - Fair Value of Assets and Liabilities (Details) - USD ($) $ in Millions | Aug. 03, 2024 | Feb. 03, 2024 | Jul. 29, 2023
--- | --- | --- | ---
Carrying Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | $ 5.5 | $ 7.9 | $ 9.1
Liabilities | (0.4) | (0.3) | (1.0)
US Treasury securities | Carrying Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 5.3 | 5.3 | 5.7
Foreign currency contracts | Carrying Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.1 | 0.0
Liabilities | (0.4) | (0.3) | (1.0)
US government agency securities | Carrying Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.5 | 0.5
Corporate bonds and notes | Carrying Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.2 | 2.0 | 2.9
Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 5.3 | 5.3 | 5.7
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 | 5.3 | 5.7
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 | 0.2 | 2.6 | 3.4
Liabilities | (0.4) | (0.3) | (1.0)
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 | 0.1 | 0.0
Liabilities | (0.4) | (0.3) | (1.0)
Level 2 | US government agency securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 0.0 | 0.5 | 0.5
Level 2 | Corporate bonds and notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | $ 0.2 | $ 2.0 | $ 2.9

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