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Income Taxes - Activity of Company's Unrecognized Income Tax Benefits (Detail) - USD ($) $ in Millions | 12 Months Ended
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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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- Definition Unrecognized tax benefits increases. + References No definition available. + Details
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