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Revenue Accounting for Contracts - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2024	Dec. 29, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 2,932,956	$ 2,810,227
United States
Disaggregation of Revenue [Line Items]
Revenues	1,812,830	1,734,649
Europe
Disaggregation of Revenue [Line Items]
Revenues	712,567	675,535
Canada
Disaggregation of Revenue [Line Items]
Revenues	58,972	63,138
Asia
Disaggregation of Revenue [Line Items]
Revenues	33,369	30,610
India
Disaggregation of Revenue [Line Items]
Revenues	36,935	35,743
Australia and New Zealand
Disaggregation of Revenue [Line Items]
Revenues	140,032	140,321
Middle East and Africa
Disaggregation of Revenue [Line Items]
Revenues	$ 138,251	$ 130,231

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