Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 25, 2021	Dec. 26, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 4,218.6
Other comprehensive income (loss) before reclassifications	(29.9)	$ 18.5
Amounts reclassified to statement of income		0.5
Ending balance	4,519.1
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(59.1)	(49.7)
Ending balance	(89.0)	(30.7)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(43.1)	(22.9)
Other comprehensive income (loss) before reclassifications	(37.8)	17.8
Amounts reclassified to statement of income		0.0
Ending balance	(80.9)	(5.1)
Pension Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1.3)	(1.8)
Other comprehensive income (loss) before reclassifications	0.0	0.0
Amounts reclassified to statement of income		0.0
Ending balance	(1.3)	(1.8)
Interest rate caps - derivative | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(0.9)
Other comprehensive income (loss) before reclassifications		(0.2)
Amounts reclassified to statement of income		0.5
Ending balance		(0.6)
Interest Rate Swap | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(14.7)	(24.1)
Other comprehensive income (loss) before reclassifications	7.9	0.9
Amounts reclassified to statement of income		0.0
Ending balance	$ (6.8)	$ (23.2)