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Business Combinations - Narrative (Details) - USD ($) shares in Millions |  |  | 3 Months Ended | 15 Months Ended
--- | --- | --- | --- | ---
Dec. 29, 2017 | Dec. 15, 2017 | Dec. 28, 2018 | Dec. 28, 2018
Business Acquisition [Line Items] |  |  |  |
Decrease in intangible assets |  |  | $ (100,000) |
Customer relationships, contracts and backlog |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Decrease in intangible assets |  |  | $ 0 |
CH2M HILL Companies, Ltd. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Percentage of outstanding shares of common and preferred stock acquired |  | 100.00% |  |
Business combination consideration paid in cash |  | $ 1,800,000,000 |  |
Business combination, cash acquired |  | 315,200,000 |  |
Business combination consideration equity issued |  | $ 1,400,000,000 |  |
Business combination consideration equity issued, shares |  | 20.7 |  |
Business combination assumed revolving credit facility and second lien notes |  | $ 706,000,000 |  |
Goodwill recognized expected to be deductible for tax purposes |  | 0 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities |  | 404,700,000 |  |
Decrease in intangible assets |  |  |  | $ 186,200,000
Decrease in property, equipment and improvements |  |  |  | 50,500,000
Decrease in receivables |  |  |  | 81,300,000
Increase in accrued liabilities |  |  |  | 352,900,000
Increase in miscellaneous long-term assets |  |  |  | 266,200,000
Goodwill increase in the period |  |  |  | $ 402,200,000
Revenue of acquiree since acquisition date, actual | $ 131,000,000 |  |  |
Earnings of acquiree since acquisition date, actual | 15,700,000 |  |  |
Restructuring and transaction costs | $ 30,000,000 |  |  |
CH2M HILL Companies, Ltd. | Customer relationships, contracts and backlog |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life |  |  | 10 years |
CH2M HILL Companies, Ltd. | Customer relationships, contracts and backlog | Minimum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible asset, useful life |  |  | 9 years |
CH2M HILL Companies, Ltd. | Customer relationships, contracts and backlog | Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible asset, useful life |  |  | 11 years |
CH2M HILL Companies, Ltd. | Other Intangible Assets and Liabilities |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life |  |  | 10 years |
CH2M HILL Companies, Ltd. | Revolving Credit Facility and Second Lien Notes |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination prepayment penalty |  | 20,000,000 |  |
Business combination assumed revolving credit facility and second lien notes |  | $ 700,000,000 |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to financial liabilities assumed in connection with a business combination for which the initial accounting was incomplete. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 4A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=SL65897772-128472 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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