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Segment Information - Schedule of Total Services Revenues for Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 02, 2020	Jun. 26, 2020	Mar. 27, 2020	Dec. 27, 2019	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Segment Reporting Information [Line Items]
Revenues	$ 3,519,689	$ 3,260,057	$ 3,427,180	$ 3,360,049	$ 3,392,862	$ 3,169,622	$ 3,091,596	$ 3,083,788	$ 13,566,975	$ 12,737,868	$ 10,579,773
Operating Segments | Critical Mission Solutions
Segment Reporting Information [Line Items]
Revenues									4,965,952	4,551,162	3,725,365
Operating Segments | People & Places Solutions
Segment Reporting Information [Line Items]
Revenues									$ 8,601,023	$ 8,186,706	$ 6,854,408

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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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