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Summary of Significant Accounting Policies - Schedule of Derivative Instruments in Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 28, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gain (loss) on derivative	$ (9.7)	$ (1.2)	$ 11.0
Unrealized gain (loss) on derivative	(3.5)	3.8	(2.1)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(13.2)	2.6	8.9
Forward foreign currency contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gain (loss) on derivative	(3.6)	0.7	11.0
Unrealized gain (loss) on derivative	0.5	(0.2)	(2.2)
Foreign Exchange Option
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gain (loss) on derivative	(6.1)	(1.9)	0.0
Unrealized gain (loss) on derivative	$ (4.0)	$ 4.0	$ 0.1

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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-Publisher FASB
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Aggregate impact of foreign currency derivatives on earnings for the period. Includes impact of foreign currency cash flow hedge ineffectiveness and the ineffectiveness of fair value hedging derivatives and full change in fair value of the foreign currency derivatives not designated as hedging instruments.

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Amount of net unrealized gain (loss) related to the change in fair value of foreign currency exchange rate derivatives designated as cash flow hedging instruments. Recorded in accumulated other comprehensive income to the extent that the cash flow hedge is determined to be effective.

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