Revenue Accounting for Contracts - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 28, 2025	Mar. 29, 2024	Mar. 28, 2025	Mar. 29, 2024
Disaggregation of Revenue [Line Items]
Revenues	$ 2,910,415	$ 2,847,179	$ 5,843,371	$ 5,657,406
United States
Disaggregation of Revenue [Line Items]
Revenues	1,796,118	1,772,269	3,608,903	3,506,954
Europe
Disaggregation of Revenue [Line Items]
Revenues	697,619	679,963	1,410,251	1,355,449
Canada
Disaggregation of Revenue [Line Items]
Revenues	55,178	61,405	114,150	124,544
Asia
Disaggregation of Revenue [Line Items]
Revenues	35,404	34,151	68,773	64,760
India
Disaggregation of Revenue [Line Items]
Revenues	44,512	37,274	81,447	73,017
Australia and New Zealand
Disaggregation of Revenue [Line Items]
Revenues	130,503	131,642	270,512	271,976
Middle East and Africa
Disaggregation of Revenue [Line Items]
Revenues	$ 151,081	$ 130,475	$ 289,335	$ 260,706