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Restructuring and Other Charges - Schedule of Restructuring and Other Activities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2022	Oct. 01, 2021	Oct. 02, 2020
Restructuring Reserve [Roll Forward]
Balance at October 2, 2020		$ 14,031
Net Charges (1)		25,824
Payments & Usage		(35,718)
Balance at October 1, 2021	$ 4,137	4,137	$ 14,031
Restructuring Cost and Reserve [Line Items]
Other restructuring costs		135,300
Payments		35,718
Recorded third-party environmental recoveries receivable	27,000	27,000
Real estate related impairments and other transformation		71,000	2,400	$ 161,400
CH2M HILL Companies, Ltd.
Restructuring Reserve [Roll Forward]
Net Charges (1)		161,063	99,590	324,183
Payments & Usage		(91,300)
Restructuring Cost and Reserve [Line Items]
Payments		$ 91,300
Real estate related impairments and other transformation	$ 78,300		$ 2,400	$ 161,400

X

- Definition

The charge against earnings in the period to reduce the carrying amount of real property to fair value.

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Amount of other expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses associated with a discontinued operation or an asset retirement obligation.

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Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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Carrying amount as of the balance sheet date of known and reasonably estimable amounts of recoveries from third-parties pertaining to an entity's environmental remediation obligations. An entity's balance sheet may include several assets that relate to an environmental remediation obligation. Among them are the following: a. Receivables from other potentially responsible parties that are not providing initial funding; b. anticipated recoveries from insurers; and c. anticipated recoveries from prior owners as a result of indemnification agreements.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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