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Sale of Energy, Chemicals and Resources ("ECR") Business (Details) - USD ($) $ in Thousands, shares in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 26, 2019 | Oct. 21, 2018 | Dec. 27, 2019 | Dec. 28, 2018 | Sep. 27, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Transition service agreement period |  |  | 1 year |  |
Selling, general and administrative expenses |  |  | $ 493,226 | $ 455,390 |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |
Other (expense) income, net |  |  |  | (6,400) |
Net Earnings of the Group from Discontinued Operations |  |  | 77,587 | 60,158 |
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |  |  |  |
Current assets held for sale |  |  | 4,022 |  | $ 952
Disposal Group, Including Discontinued Operation, Assets, Noncurrent [Abstract] |  |  |  |  |
Noncurrent assets held for sale |  |  | 26,530 |  | 26,978
Disposal Group, Including Discontinued Operation, Liabilities, Current [Abstract] |  |  |  |  |
Current liabilities held for sale |  |  | 797 |  | 2,573
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent [Abstract] |  |  |  |  |
Noncurrent liabilities held for sale |  |  | 52 |  | 97
Depreciation and amortization: |  |  |  |  |
Intangible assets |  |  | 21,845 | 19,285 |
Stock based compensation |  |  | 14,279 | 15,594 |
Nui Phao Mining Company |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Selling, general and administrative expenses |  |  | 50,000 |  |
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 | Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Modified lock-up share consideration, period | 56 days |  |  |  |
Pre-tax gain on sale |  |  | 1,000,000 |  |
Gain on sale of businesses |  |  | 61,943 | 0 | 935,100
Equity method investment retained after disposal | $ 33,000 |  |  |  |
Deferred gain on disposal | 34,400 |  |  |  |
Deferred revenue of separate deliverable and recognized deferred income | $ 95,300 |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |
Revenues |  |  | 7,099 | 1,164,707 |
Direct cost of contracts |  |  | (4,692) | (995,606) |
Gross profit |  |  | 2,407 | 169,101 |
Selling, general and administrative expenses |  |  | 47,159 | (91,010) |
Operating Profit (Loss) |  |  | 49,566 | 78,091 |
Other (expense) income, net |  |  | 1 | 2,120 |
Earnings Before Taxes from Discontinued Operations |  |  | 111,510 | 80,211 |
Income Tax Expense |  |  | (33,923) | (20,053) |
Net Earnings of the Group from Discontinued Operations |  |  | 77,587 | 60,158 |
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |  |  |  |
Receivables and contract assets |  |  | 3,976 |  | 871
Prepaid expenses and other |  |  | 46 |  | 81
Current assets held for sale |  |  | 4,022 |  | 952
Disposal Group, Including Discontinued Operation, Assets, Noncurrent [Abstract] |  |  |  |  |
Property, Equipment and Improvements, net |  |  | 1,200 |  | 1,643
Goodwill |  |  | 24,896 |  | 24,896
Miscellaneous |  |  | 434 |  | 439
Noncurrent assets held for sale |  |  | 26,530 |  | 26,978
Disposal Group, Including Discontinued Operation, Liabilities, Current [Abstract] |  |  |  |  |
Accounts payable and accrued liabilities |  |  | 778 |  | 2,495
Contract liabilities |  |  | 19 |  | 78
Current liabilities held for sale |  |  | 797 |  | 2,573
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent [Abstract] |  |  |  |  |
Other Deferred Liabilities |  |  | 52 |  | 97
Noncurrent liabilities held for sale |  |  | 52 |  | $ 97
Depreciation and amortization: |  |  |  |  |
Property, equipment and improvements |  |  | 0 | 2,110 |
Intangible assets |  |  | 0 | 614 |
Additions to property and equipment |  |  | 0 | (1,254) |
Stock based compensation |  |  | $ 0 | $ 3,615 |
Worley Stock |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Equity instrument consideration, shares | 58.2 |  |  |  |
Sale of stock (in shares) |  |  | 6.8 |  |
Loss on sale of stock |  |  | $ 4,900 |  |
Worley Stock | Fair Value, Inputs, 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 |  |  | 556,500 |  |
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 |  |  |
SG&A |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Transaction costs |  |  | $ 12,000 |  |

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