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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	12 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 311,470	$ 153,640	$ 92,880
Lease Abandonments
Restructuring Cost and Reserve [Line Items]
Restructuring costs	99,976	61,526	40,575
Involuntary Terminations
Restructuring Cost and Reserve [Line Items]
Restructuring costs	33,742	29,056	34,797
Outside Services
Restructuring Cost and Reserve [Line Items]
Restructuring costs	133,148	35,987	4,236
Other
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 44,604	$ 27,071	$ 13,272

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

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