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Employee Pension and Profit Sharing Plans - Schedule of Allocation of Plan Assets (Details) - USD ($) $ in Thousands | Sep. 27, 2019 | Sep. 28, 2018 | Sep. 29, 2017
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 425,967 | $ 409,826 | $ 341,538
Quoted Prices in Active Markets Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 24,073 | 32,257 |
Significant Other Observable Inputs Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 391,469 | 367,124 |
Significant Unobservable Inputs Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 10,425 | 10,445 |
Cash and Cash Equivalents and Other | Quoted Prices in Active Markets Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 19,396 | 20,568 |
Investment Trusts | Quoted Prices in Active Markets Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 4,677 | 11,689 |
Pooled Funds - Equity | Significant Other Observable Inputs Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 72,074 | 220,853 |
Pooled Funds - Fixed Income | Significant Other Observable Inputs Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 319,395 | 146,271 |
Real Estate | Quoted Prices in Active Markets Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0 |
Real Estate | Significant Other Observable Inputs Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0 |
Real Estate | Significant Unobservable Inputs Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 10,425 | 10,445 |
Fair Value Disclosure |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 425,967 | 409,826 |
Fair Value Disclosure | Cash and Cash Equivalents and Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 19,396 | 20,568 |
Fair Value Disclosure | Investment Trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 4,677 | 11,689 |
Fair Value Disclosure | Pooled Funds - Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 72,074 | 220,853 |
Fair Value Disclosure | Pooled Funds - Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 319,395 | 146,271 |
Fair Value Disclosure | Real Estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 10,425 | $ 10,445 |

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