Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Mar. 26, 2022	Mar. 27, 2021	Mar. 26, 2022	Mar. 27, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ 4,218.6
Other comprehensive income (loss) before reclassifications	$ (15.1)	$ (5.1)	(45.0)	$ 13.4
Amounts reclassified to statement of income		0.0		0.5
Ending balance	4,792.7		4,792.7
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(89.0)	(30.7)	(59.1)	(49.7)
Ending balance	(104.1)	(35.8)	(104.1)	(35.8)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(80.9)	(5.1)	(43.1)	(22.9)
Other comprehensive income (loss) before reclassifications	(34.5)	(9.4)	(72.3)	8.4
Amounts reclassified to statement of income		0.0		0.0
Ending balance	(115.4)	(14.5)	(115.4)	(14.5)
Pension Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1.3)	(1.8)	(1.3)	(1.8)
Other comprehensive income (loss) before reclassifications	0.0	0.0	0.0	0.0
Amounts reclassified to statement of income		0.0		0.0
Ending balance	(1.3)	(1.8)	(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		(0.6)		(0.9)
Other comprehensive income (loss) before reclassifications		0.6		0.4
Amounts reclassified to statement of income		0.0		0.5
Ending balance		0.0		0.0
Interest Rate Swap \| Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(6.8)	(23.2)	(14.7)	(24.1)
Other comprehensive income (loss) before reclassifications	19.4	3.7	27.3	4.6
Amounts reclassified to statement of income		0.0		0.0
Ending balance	$ 12.6	$ (19.5)	$ 12.6	$ (19.5)

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