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Revenue Accounting for Contracts (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Oct. 01, 2021	Oct. 02, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	$ 14,922,825	$ 14,092,632	$ 13,566,975
Contract liability	$ 422,000	$ 405,000
U.S. Federal Government and it's Agencies | Revenue Benchmark | Customer Concentration Risk
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Concentration risk, percentage	31.00%	33.00%	33.00%
U.S. Plans
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	$ 9,875,252	$ 9,671,281	$ 10,158,508
Europe
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	3,488,317	3,140,114	2,253,284
Canada
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	269,386	227,692	227,067
Asia
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	140,663	114,118	117,698
India
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	114,235	70,772	50,618
Australia and New Zealand
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	706,283	647,866	537,076
South America and Mexico
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	0	0	11
Middle East and Africa
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	$ 328,689	$ 220,789	$ 222,713

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