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Restructuring and Other Charges - Summary of Restructuring and Other Activities by Major Type of Costs (Details) - CH2M HILL Companies, Ltd. - USD ($) $ in Thousands	3 Months Ended
	Dec. 28, 2018	Dec. 29, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 39,401	$ 19,349
Lease Abandonments
Restructuring Cost and Reserve [Line Items]
Restructuring costs	2,484	3,363
Involuntary Terminations
Restructuring Cost and Reserve [Line Items]
Restructuring costs	2,909	2,184
Outside Services
Restructuring Cost and Reserve [Line Items]
Restructuring costs	18,198	8,590
Other
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 15,810	$ 5,212

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- Definition

Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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