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Revenue Accounting for Contracts - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 28, 2024	Jun. 30, 2023	Jun. 28, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 4,231,580	$ 4,186,702	$ 12,659,898	$ 12,063,702
United States
Disaggregation of Revenue [Line Items]
Revenues	2,849,019	2,816,773	8,526,005	8,047,887
Europe
Disaggregation of Revenue [Line Items]
Revenues	939,407	905,917	2,822,187	2,691,479
Canada
Disaggregation of Revenue [Line Items]
Revenues	67,205	70,164	192,235	193,880
Asia
Disaggregation of Revenue [Line Items]
Revenues	32,721	35,054	98,334	105,520
India
Disaggregation of Revenue [Line Items]
Revenues	37,946	39,749	110,963	126,922
Australia and New Zealand
Disaggregation of Revenue [Line Items]
Revenues	170,971	181,308	509,117	512,416
Middle East and Africa
Disaggregation of Revenue [Line Items]
Revenues	$ 134,311	$ 137,737	$ 401,057	$ 385,598

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