Fair value of financial instruments - Narrative (Details) - Foreign currency forward contracts $ in Millions, $ in Millions	3 Months Ended		12 Months Ended
	Sep. 27, 2024 USD ($) contract	Sep. 29, 2023 USD ($)	Jun. 28, 2024 USD ($) contract	Sep. 27, 2024 CAD ($) contract	Jun. 28, 2024 CAD ($) contract
Foreign Currency Fair Value Hedge Derivative [Line Items]
Derivative assets, notional amount			$ 8.0
Gain/(loss) from accumulated other comprehensive income expected to be reclassified	$ 7.7		$ (1.2)
Unrealized gain (loss) on derivatives	$ 4.1	$ 0.3
Designated as hedging instrument | Thailand, baht
Foreign Currency Fair Value Hedge Derivative [Line Items]
Number of forward contracts outstanding | contract	130		135	130	135
Derivative, notional amount	$ 130.0		$ 135.0
Designated as hedging instrument | Canada, dollars
Foreign Currency Fair Value Hedge Derivative [Line Items]
Number of forward contracts outstanding | contract	1		1	1	1
Derivative assets, notional amount				$ 0.4	$ 0.4