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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	12 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 311,470
CH2M HILL Companies, Ltd.
Restructuring Cost and Reserve [Line Items]
Restructuring charges	311,332	$ 190,806	$ 135,438
CH2M HILL Companies, Ltd. | Operating Segments | Critical Mission Solutions
Restructuring Cost and Reserve [Line Items]
Restructuring charges	17,989	20,254	2,356
CH2M HILL Companies, Ltd. | Operating Segments | People & Places Solutions
Restructuring Cost and Reserve [Line Items]
Restructuring charges	108,835	56,238	47,743
CH2M HILL Companies, Ltd. | Operating Segments | Continuing Operations
Restructuring Cost and Reserve [Line Items]
Restructuring charges	311,470	153,640	92,880
CH2M HILL Companies, Ltd. | Operating Segments | Energy, Chemicals and Resources (included in Discontinued Operations)
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(138)	37,166	42,558
CH2M HILL Companies, Ltd. | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 184,646	$ 77,148	$ 42,781

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

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-Publisher FASB
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