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Summary of Significant Accounting Policies - Schedule of Other Assets (Detail) - USD ($) | Sep. 26, 2020 | Sep. 29, 2019 | Sep. 28, 2019
--- | --- | --- | ---
Accounting Policies [Abstract] |  |  |
Income Taxes Receivable | $ 325,700,000 |  | $ 0
Operating lease, right-of-use assets | 80,700,000 | $ 91,700,000 | 0
Life insurance contracts | 49,300,000 |  | 44,600,000
Manufacturing access fees | 15,500,000 |  | 17,200,000
Cost-method equity investments | 11,400,000 |  | 11,400,000
Equity-method investment and loans to SSI (Note 5) | 0 |  | 42,700,000
Other | 34,000,000.0 |  | 38,700,000
Other assets | $ 516,600,000 |  | $ 154,600,000

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