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Segment Information - Schedule of Total Services Revenues for Reportable Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 01, 2021	Oct. 02, 2020	Sep. 27, 2019
Segment Reporting Information [Line Items]
Revenues	$ 14,092,632	$ 13,566,975	$ 12,737,868
Critical Mission Solutions
Segment Reporting Information [Line Items]
Revenues	5,087,052	4,965,952	4,551,162
People & Places Solutions
Segment Reporting Information [Line Items]
Revenues	8,378,179	8,601,023	8,186,706
PA Consulting
Segment Reporting Information [Line Items]
Revenues	$ 627,401	$ 0	$ 0

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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