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Revenue Accounting for Contracts - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jul. 01, 2022	Jun. 30, 2023	Jul. 01, 2022
Disaggregation of Revenue [Line Items]
Revenues	$ 4,186,702	$ 3,827,093	$ 12,063,702	$ 11,041,777
United States
Disaggregation of Revenue [Line Items]
Revenues	2,816,773	2,577,892	8,047,887	7,226,189
Europe
Disaggregation of Revenue [Line Items]
Revenues	905,917	862,011	2,691,479	2,666,219
Canada
Disaggregation of Revenue [Line Items]
Revenues	70,164	74,509	193,880	206,701
Asia
Disaggregation of Revenue [Line Items]
Revenues	35,054	35,741	105,520	104,361
India
Disaggregation of Revenue [Line Items]
Revenues	39,749	30,761	126,922	81,753
Australia and New Zealand
Disaggregation of Revenue [Line Items]
Revenues	181,308	172,926	512,416	532,228
Middle East and Africa
Disaggregation of Revenue [Line Items]
Revenues	$ 137,737	$ 73,253	$ 385,598	$ 224,326

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