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Long-term Debt - (Narrative) (Details) | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 30, 2018 tranche | Jun. 29, 2018 USD ($) | Sep. 29, 2017 USD ($) | Feb. 07, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |
Long-term Debt |  | $ 2,336,473,000 | $ 235,000,000 |
Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Facility fee percentage |  | 0.10% |  |
Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Facility fee percentage |  | 0.25% |  |
Revolving Credit Facility One Billion Six Hundred Million |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Available borrowing capacity |  | $ 1,300,000,000 |  |
Term Loan Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt |  | 1,500,000,000 | 0 |
Senior Notes As Amended Note Purchase Agreement |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt |  | 500,000,000 |  |
Long-term debt fair value |  | 498,400,000 |  |
Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Number of tranches | tranche | 2 |  |  |
Long-term Debt |  | 338,816,000 | 235,000,000 |
Revolving Credit Facility | Revolving Credit Facility One Billion Six Hundred Million |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  | $ 1,600,000,000.0
Credit facility, potential borrowing capacity |  |  |  | $ 2,100,000,000
Letter of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility, maximum borrowing capacity |  | 300,000,000 |  |
Letter of Credit | Revolving Credit Facility One Billion Six Hundred Million |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Direct borrowings on credit facility |  | 2,500,000 |  |
Letter of Credit | Committed And Uncommitted Letter Of Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Direct borrowings on credit facility |  | 446,700,000 |  |
Sub Facility Of Swing Line Loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility, maximum borrowing capacity |  | 50,000,000 |  |
CH2M HILL Companies, Ltd. |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Equipment financing |  | $ 3,100,000 |  |
CH2M HILL Companies, Ltd. | Equipment Financing | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Equipment financing rate |  | 0.22% |  |
CH2M HILL Companies, Ltd. | Equipment Financing | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Equipment financing rate |  | 3.29% |  |
Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term debt |  | $ 449,200,000 | $ 262,100,000 |
Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Contingent interest rate increase |  | 0.75% |  |

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- Definition Line of credit facility accordion feature potential borrowing capacity. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 + Details
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