Derivatives - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019	Sep. 28, 2019	Sep. 29, 2018
Derivative [Line Items]
Interest Rate Cap Agreements Aggregate Premium Payable			$ 1.5	$ 3.7
Borrowed principal	$ 1,000.0
Notional Amount	299.5
Amount of gain (loss) recognized in other comprehensive income, net of taxes:	0.7	$ 4.0
Interest Rate Swap
Derivative [Line Items]
Derivative notional amount	$ 1,000.0
Variable interest rate	1.23%
Interest rate swap at fair value	$ 30.7
Amount of gain (loss) recognized in other comprehensive income, net of taxes:	0.9	$ (4.3)
Foreign Exchange Option
Derivative [Line Items]
Derivative notional amount	$ 245.2