Derivatives - Schedule Of Change in Fair Value Of Derivative Contracts (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Mar. 27, 2021	Mar. 28, 2020	Mar. 27, 2021	Mar. 28, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Total	$ 6.8	$ 3.3	$ (11.9)	$ 0.1
Derivatives not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of realized gain (loss) recognized in income	1.6	(0.4)	(2.5)	(0.6)
Amount of unrealized gain (loss) recognized in income	5.2	3.7	(9.4)	0.7
Forward foreign currency contracts \| Derivatives not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of realized gain (loss) recognized in income	3.4	0.1	0.5	0.1
Amount of unrealized gain (loss) recognized in income	3.1	2.6	(3.5)	1.1
Foreign currency option contracts \| Derivatives not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of realized gain (loss) recognized in income	(1.8)	(0.5)	(3.0)	(0.7)
Amount of unrealized gain (loss) recognized in income	$ 2.1	$ 1.1	$ (5.9)	$ (0.4)

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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