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Segment Information - Schedule of Total Services Revenues for Reportable Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Oct. 01, 2021	Oct. 02, 2020
Segment Reporting Information [Line Items]
Revenues	$ 14,922,825	$ 14,092,632	$ 13,566,975
Critical Mission Solutions
Segment Reporting Information [Line Items]
Revenues	5,233,629	5,087,052	4,965,952
People & Places Solutions
Segment Reporting Information [Line Items]
Revenues	8,569,900	8,378,179	8,601,023
PA Consulting
Segment Reporting Information [Line Items]
Revenues	$ 1,119,296	$ 627,401	$ 0

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