Derivatives - Schedule Of Change in Fair Value Of Derivative Contracts (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Amount of realized (loss) gain recognized in income	$ 0.0	$ 3.0	$ (0.7)	$ 6.5
Amount of unrealized (loss) gain recognized in income	(2.0)	(2.1)	(1.1)	(0.2)
Forward foreign currency contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of realized (loss) gain recognized in income	0.5	3.0	0.6	6.5
Amount of unrealized (loss) gain recognized in income	(1.8)	(2.1)	(0.6)	(0.2)
Foreign currency option contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of realized (loss) gain recognized in income	(0.5)	0.0	(1.3)	0.0
Amount of unrealized (loss) gain recognized in income	$ (0.2)	$ 0.0	$ (0.5)	$ 0.0