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Goodwill and Intangibles - Schedule of Carrying Value of Goodwill by Reportable Segment Appearing in Accompanying Consolidated Balance Sheets (Details) $ in Thousands	12 Months Ended
	Oct. 01, 2021 USD ($)
Goodwill [Roll Forward]
Balance October 2, 2020	$ 5,639,091
Acquired	1,579,019
Post-Acquisition Adjustments	1,612
Foreign Exchange Impact	(22,722)
Balance October 1, 2021	7,197,000
Critical Mission Solutions
Goodwill [Roll Forward]
Balance October 2, 2020	2,409,081
Acquired	130,691
Post-Acquisition Adjustments	1,612
Foreign Exchange Impact	9,247
Balance October 1, 2021	2,550,631
People & Places Solutions
Goodwill [Roll Forward]
Balance October 2, 2020	3,230,010
Acquired	0
Post-Acquisition Adjustments	0
Foreign Exchange Impact	10,773
Balance October 1, 2021	3,240,783
PA Consulting
Goodwill [Roll Forward]
Balance October 2, 2020	0
Acquired	1,448,328
Post-Acquisition Adjustments	0
Foreign Exchange Impact	(42,742)
Balance October 1, 2021	$ 1,405,586

X

- Definition

Goodwill, Adjustments During Period

+ References

No definition available.

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X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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-Publisher FASB
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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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