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Summary of Significant Accounting Policies - Schedule of Other Assets (Detail) - USD ($) $ in Millions | Sep. 25, 2021 | Sep. 26, 2020
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Accounting Policies [Abstract] |  |
Income Taxes Receivable | $ 24.7 | $ 325.7
Operating lease, right-of-use assets | 83.6 | 80.7
Life insurance contracts | 64.3 | 49.3
Manufacturing access fees | 21.9 | 15.5
Cost-method equity investments | 9.5 | 11.4
Other | 41.7 | 34.0
Other assets | $ 245.7 | $ 516.6

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