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Income Taxes - Activity of Company's Unrecognized Income Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 24, 2022
Income Tax Disclosure [Abstract]
Balance at beginning of fiscal year	$ 247.6	$ 212.8
Tax positions related to current year:
Additions	6.8	45.9
Reductions	0.0	0.0
Tax positions related to prior years:
Additions related to change in estimate	4.5	21.5
Reductions	0.0	(6.6)
Lapses in statutes of limitations and settlements	(2.4)	(26.0)
Acquired tax positions:
Balance as of the end of the fiscal year	$ 256.5	$ 247.6

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Tax positions related to current year.

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Amount of unrecognized tax benefits.

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