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Long-term Debt - Term Loan Facility (Narrative) (Details) - USD ($) |  | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 15, 2017 | Mar. 30, 2018 | Mar. 12, 2018 | Sep. 29, 2017 | Sep. 28, 2017
Senior Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Contingent Interest Rate, Increase (Decrease) |  | 0.75% |  |  |
Aggregate principal amount |  |  | $ 500,000,000 |  |
Eurocurrency Interest Rate | Minimum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Margin added to variable rate interest rate (percentage) |  | 1.00% |  |  |
Eurocurrency Interest Rate | Maximum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Margin added to variable rate interest rate (percentage) |  | 1.50% |  |  |
Base Interest Rate | Minimum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Margin added to variable rate interest rate (percentage) |  | 0.00% |  |  |
Base Interest Rate | Maximum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Margin added to variable rate interest rate (percentage) |  | 0.50% |  |  |
CH2M HILL Companies, Ltd. |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Acquisition date | Dec. 15, 2017 |  |  |  |
Equipment financing |  | $ 5,900,000 |  |  |
CH2M HILL Companies, Ltd. | Senior Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Equipment financing |  | 2,500,000 |  |  |
CH2M HILL Companies, Ltd. | Equipment Financing |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Equipment financing |  | $ 3,400,000 |  |  |
Payment due in installments |  | monthly |  |  |
CH2M HILL Companies, Ltd. | Minimum | Equipment Financing |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Stated interest rate |  | 0.22% |  |  |
CH2M HILL Companies, Ltd. | Maximum | Equipment Financing |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Stated interest rate |  | 3.29% |  |  |
Term Loan Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Direct borrowings on credit facility |  | $ 1,500,000,000 |  | $ 0 | $ 1,500,000,000
Term Loan Facility | Eurocurrency Interest Rate | Minimum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Margin added to variable rate interest rate (percentage) |  | 1.00% |  |  |
Term Loan Facility | Eurocurrency Interest Rate | Maximum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Margin added to variable rate interest rate (percentage) |  | 1.50% |  |  |
Term Loan Facility | Base Interest Rate | Minimum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Margin added to variable rate interest rate (percentage) |  | 0.00% |  |  |
Term Loan Facility | Base Interest Rate | Maximum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Margin added to variable rate interest rate (percentage) |  | 0.50% |  |  |
Term Loan Facility | CH2M HILL Companies, Ltd. |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Acquisition date |  | Dec. 15, 2017 |  |  |
Senior Notes, Series A | Senior Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Aggregate principal amount |  |  | $ 190,000,000 |  |
Stated interest rate |  |  | 4.27% |  |
Senior Notes, Series B | Senior Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Aggregate principal amount |  |  | $ 180,000,000 |  |
Stated interest rate |  |  | 4.42% |  |
Senior Notes, Series C | Senior Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Aggregate principal amount |  |  | $ 130,000,000 |  |
Stated interest rate |  |  | 4.52% |  |
LIBOR | CH2M HILL Companies, Ltd. | Senior Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Margin added to variable rate interest rate (percentage) |  | 2.50% |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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