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Joint Ventures and VIE's (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 27, 2020 | Mar. 29, 2019 | Mar. 27, 2020 | Mar. 29, 2019 | Sep. 27, 2019
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |  |  |  |
Consolidated assets | $ 13,134,613 |  | $ 13,134,613 |  | $ 11,462,711
Amount by which equity method investments exceeded share of venture net assets | 70,300 |  | 70,300 |  |
Consolidated Joint Venture | Variable Interest Entity, Primary Beneficiary |  |  |  |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |  |  |  |
Consolidated assets | 237,300 |  | 237,300 |  | 192,600
Consolidated Joint Venture | VIE Primary beneficiary, aggregate disclosure | Variable Interest Entity, Primary Beneficiary |  |  |  |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |  |  |  |
Consolidated liabilities | 134,300 |  | 134,300 |  | 138,500
Unconsolidated Joint Venture | VIE not primary beneficiary, aggregate disclosure |  |  |  |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |  |  |  |
VIE unconsolidated assets | 96,000 |  | 96,000 |  | 61,100
VIE unconsolidated liabilities | 87,500 |  | 87,500 |  | 63,700
Accounts receivable from unconsolidated joint ventures accounted for under the equity method | 7,400 |  | 7,400 |  | 19,500
Unconsolidated Joint Venture | VIE, not primary beneficiary |  |  |  |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |  |  |  |
VIE unconsolidated assets | 166,900 |  | 166,900 |  | $ 157,900
Income from equity method joint ventures | $ 18,800 | $ 12,400 | $ 36,000 | $ 25,900 |

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