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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. 27, 2019	Dec. 28, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 52,041	$ 45,059
Lease Abandonments
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0	9,554
Involuntary Terminations
Restructuring Cost and Reserve [Line Items]
Restructuring costs	13,153	2,348
Outside Services
Restructuring Cost and Reserve [Line Items]
Restructuring costs	31,466	18,198
Other
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 7,422	$ 14,959

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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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