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Fair value of financial instruments - Narrative (Details) - Foreign currency forward contracts $ in Millions, $ in Millions	3 Months Ended		12 Months Ended
	Sep. 25, 2026 USD ($) contract	Sep. 26, 2025 USD ($)	Jun. 26, 2026 USD ($) contract	Sep. 25, 2026 CAD ($) contract	Jun. 26, 2026 CAD ($) contract
Derivative [Line Items]
Derivative liabilities, notional amount	$ 275.0		$ 279.0
Gain/(loss) from accumulated other comprehensive income expected to be reclassified	$ (3.7)		$ (5.6)
Canada, dollars
Derivative [Line Items]
Derivative liabilities, notional amount				$ 0.3
Designated as hedging instrument \| Thailand, baht
Derivative [Line Items]
Number of forward contracts outstanding \| contract	280		272	280	272
Derivative, notional amount	$ 292.0		$ 280.0
Designated as hedging instrument \| Canada, dollars
Derivative [Line Items]
Number of forward contracts outstanding \| contract	1		1	1	1
Derivative liabilities, notional amount				$ 0.3	$ 0.3
Not Designated as Hedging Instrument
Derivative [Line Items]
Unrealized gain (loss) on derivatives	$ 1.2	$ (1.3)