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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		6 Months Ended
	Mar. 29, 2019	Mar. 30, 2018	Mar. 29, 2019	Mar. 30, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 69,622	$ 69,351	$ 109,023	$ 88,701
Lease Abandonments
Restructuring Cost and Reserve [Line Items]
Restructuring costs	40,875	37,073	43,359	40,436
Involuntary Terminations
Restructuring Cost and Reserve [Line Items]
Restructuring costs	8,050	16,936	10,959	19,120
Outside Services
Restructuring Cost and Reserve [Line Items]
Restructuring costs	37,709	8,170	56,134	16,759
Other(1)
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ (17,012)	$ 7,172	$ (1,429)	$ 12,386

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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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