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Restructuring and Other Charges - Summary of Restructuring and Other Activities by Major Type of Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 02, 2021	Jun. 26, 2020	Jul. 02, 2021	Jun. 26, 2020
Restructuring Cost and Reserve [Line Items]
Impairment of equity method investment			$ (40,138)	$ 0
AWE Management Ltd
Restructuring Cost and Reserve [Line Items]
Impairment of equity method investment			(38,900)
CH2M Hill, KeyM, John Wood Group Acquisitions and ECR Sale
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 13,768	$ 19,681	92,509	112,309
CH2M Hill, KeyM, John Wood Group Acquisitions and ECR Sale | Lease Abandonments and Impairments
Restructuring Cost and Reserve [Line Items]
Restructuring costs	354	(11,776)	2,565	(7,860)
CH2M Hill, KeyM, John Wood Group Acquisitions and ECR Sale | Voluntary and Involuntary Terminations
Restructuring Cost and Reserve [Line Items]
Restructuring costs	1,692	(49)	14,227	18,222
CH2M Hill, KeyM, John Wood Group Acquisitions and ECR Sale | Outside Services
Restructuring Cost and Reserve [Line Items]
Restructuring costs	5,463	20,865	31,516	74,223
CH2M Hill, KeyM, John Wood Group Acquisitions and ECR Sale | Other
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 6,259	$ 10,641	$ 44,201	$ 27,724

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- Definition

This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 35
-Paragraph 32
-URI http://asc.fasb.org/extlink&oid=124268079&loc=d3e32787-111569

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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=123570139&loc=d3e3602-108585

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