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Sale of Energy, Chemicals and Resources ("ECR") Business (Narrative) (Details) - USD ($) $ in Thousands, shares in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 27, 2019 | Apr. 26, 2019 | Sep. 27, 2019 | Oct. 02, 2020 | Sep. 27, 2019 | Sep. 28, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  | $ 2,050,695 | $ 2,072,177 | $ 1,771,107
Interest expense |  |  |  | 62,206 | 83,847 | 76,760
Loss on investment in equity securities |  |  |  | 103,623 | 78,108 | 0
Nui Phao Mining Company |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Selling, general and administrative expenses | $ 40,000 |  |  | $ 40,000 |  |
Worley Stock |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Equity instrument consideration, shares |  | 58.2 |  |  |  |
Number of shares issued in transaction |  |  |  | 6.8 |  |
Loss on sale of investments |  |  |  | $ 4,900 |  |
Worley Stock | Level 1 |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Prepaid expense and other assets estimated fair value |  |  | $ 451,100 | 347,500 | 451,100 |
Worley Stock | Restricted Stock |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Equity instrument consideration, shares |  | 51.4 |  |  |  |
Dividend income |  |  |  | 16,900 | 5,200 |
Loss on investment in equity securities |  |  |  | 103,600 | 78,100 |
Other (Expense) Income, Net |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Other operating expense |  | $ (35,400) |  |  |  |
SG&A Expense |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Transaction costs |  | 15,800 |  |  |  |
Discontinued Operations | Nui Phao Mining Company |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Interest expense |  |  |  |  | 35,000 |
Foreign currency revaluations |  |  |  |  | 6,000 |
Miscellaneous Income |  |  |  |  | 4,400 |
Other operating expense |  |  |  |  | 9,600 |
ECR Business |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Consideration transferred |  | 3,400,000 |  |  |  |
Business combination consideration paid in cash |  | 2,800,000 |  |  |  |
ECR Business | Other (Expense) Income, Net |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Miscellaneous Income |  |  |  |  |  | 8,400
ECR Business | Other (Expense) Income, Net | Guimar Joint Venture |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain on sale of businesses |  |  |  |  |  | 21,000
ECR Business | Discontinued Operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain on sale of businesses |  | 1,000,000 | $ 17,400 | 110,236 | 935,110 | 0
Equity method investment retained after disposal |  | 33,000 |  |  |  |
Deferred gain on disposal |  | 34,400 |  |  |  |
Revenues |  | $ 95,300 |  | $ 11,235 | $ 2,725,699 | $ 4,404,873

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