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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		6 Months Ended
	Mar. 29, 2019	Mar. 30, 2018	Mar. 29, 2019	Mar. 30, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			$ 141,472
CH2M HILL Companies, Ltd.
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 69,622	$ 69,351	109,023	$ 88,701
CH2M HILL Companies, Ltd. | Continuing Operations
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	66,821	76,939	111,880	92,668
CH2M HILL Companies, Ltd. | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	18,854	57,243	53,065	69,768
CH2M HILL Companies, Ltd. | Aerospace, Technology and Nuclear | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	341	1,409	790	1,722
CH2M HILL Companies, Ltd. | Buildings, Infrastructure and Advanced Facilities | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	47,626	18,287	58,025	21,178
CH2M HILL Companies, Ltd. | Energy, Chemicals and Resources | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	2,801	$ (7,588)	(2,857)	$ (3,967)
Other Expense | CH2M HILL Companies, Ltd.
Restructuring Cost and Reserve [Line Items]
Litigation expenses included in segment profit	$ 32,400
Other Expense | Other(1) | CH2M HILL Companies, Ltd.
Restructuring Cost and Reserve [Line Items]
Litigation expenses included in segment profit			$ 34,600

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+ 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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