Derivatives - Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 28, 2019	Dec. 29, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in other comprehensive income, net of taxes:	$ 4.0	$ (3.9)
Changes in value of hedged interest rate swaps and interest rate caps, net of tax of $1.7 and $0.5 for the three months ended December 28, 2019 and December 29, 2018.	4.0	(3.9)
Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in other comprehensive income, net of taxes:	4.3	0.0
Interest rate cap agreements
Derivative Instruments, Gain (Loss) [Line Items]
Changes in value of hedged interest rate swaps and interest rate caps, net of tax of $1.7 and $0.5 for the three months ended December 28, 2019 and December 29, 2018.	$ (0.3)	$ (3.9)