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Restructuring and Other Charges - Summary of Restructuring and Other Charges Impacts on Reportable Segment Income by Line of Business (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 28, 2018	Dec. 29, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 39,401
Operating Segments | Buildings, Infrastructure and Advanced Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	22,600
CH2M HILL Companies, Ltd.
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	39,401	$ 19,349
Continuing Operations | CH2M HILL Companies, Ltd.
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	45,059	15,728
Continuing Operations | CH2M HILL Companies, Ltd. | Operating Segments | Aerospace, Technology and Nuclear
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	449	312
Continuing Operations | CH2M HILL Companies, Ltd. | Operating Segments | Buildings, Infrastructure and Advanced Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	11,224	2,891
Continuing Operations | CH2M HILL Companies, Ltd. | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	33,386	12,525
Discontinued Operations | CH2M HILL Companies, Ltd. | Operating Segments | Energy, Chemicals and Resources
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ (5,658)	$ 3,621

X

- Definition

Amount 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 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747

Reference 2: 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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

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+ References

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