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Organization and Significant Accounting Policies - Investments, Additional Information (Details) $ in Millions | 12 Months Ended
--- | ---
Sep. 26, 2020 USD ($) company | Sep. 28, 2019 USD ($) | Sep. 29, 2018 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |
Number of unconsolidated companies | company | 11 |  |
Equity income (loss) | $ (3.9) | $ 1.2 | $ (2.8)
Investment in unconsolidated companies | $ 13.1 | $ 12.1 |
Minimum |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Owned percentage in unconsolidated entities | 7.00% |  |
Maximum |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Owned percentage in unconsolidated entities | 50.00% |  |

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