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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