Fair value of financial instruments - Narrative (Details) $ in Millions, $ in Millions	3 Months Ended			6 Months Ended
	Dec. 27, 2024 USD ($) contract	Sep. 27, 2024 USD ($)	Dec. 29, 2023 USD ($)	Dec. 27, 2024 USD ($) contract	Dec. 29, 2023 USD ($)	Dec. 27, 2024 CAD ($) contract	Jun. 28, 2024 USD ($) contract	Jun. 28, 2024 CAD ($) contract
Foreign Currency Fair Value Hedge Derivative [Line Items]
Unrealized gain (loss) on derivatives	$ (5.1)		$ 2.6	$ (1.0)	$ 2.9
Foreign currency forward contracts
Foreign Currency Fair Value Hedge Derivative [Line Items]
Derivative liabilities, notional amount	$ (119.0)			(119.0)			$ (127.0)
Derivative assets, notional amount							$ 8.0
Gain/(loss) from accumulated other comprehensive income expected to be reclassified		$ (1.2)		$ (2.1)
Foreign currency forward contracts | Canada, dollars
Foreign Currency Fair Value Hedge Derivative [Line Items]
Derivative liabilities, notional amount						$ (0.3)		$ (0.4)
Foreign currency forward contracts | Designated as hedging instrument | Thailand, baht
Foreign Currency Fair Value Hedge Derivative [Line Items]
Number of forward contracts outstanding | contract	146			146		146	135	135
Derivative, notional amount	$ 146.0			$ 146.0			$ 135.0
Foreign currency forward contracts | Designated as hedging instrument | Canada, dollars
Foreign Currency Fair Value Hedge Derivative [Line Items]
Number of forward contracts outstanding | contract	1			1		1	1	1
Derivative liabilities, notional amount						$ (0.3)		$ (0.4)