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Revenue from Contracts with Customers (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 30, 2023	Jun. 28, 2025	Mar. 29, 2025	Dec. 28, 2024	Jun. 29, 2024	Mar. 30, 2024	Dec. 30, 2023
Disaggregation of Revenue [Line Items]
Contract with Customer, Performance Obligation Satisfied in Previous Period	$ 11,640	$ (9,409)	$ (3,095)
Contract reserves	84,360	81,180
Unbilled receivables	744,352	690,572	$ 634,787	$ 719,002	$ 719,569	$ 722,384	$ 745,680	$ 773,379	$ 743,497
Contract with Customer, Liability, Revenue Recognized	235,130
Revenue, Remaining Performance Obligation, Amount	$ 6,010,000
Revenue, Remaining Performance Obligation, Percentage	50.00%
U.S. Government (including OEM)
Disaggregation of Revenue [Line Items]
Unbilled receivables	$ 12,111	$ 20,394
Minimum
Disaggregation of Revenue [Line Items]
Revenue, Performance Obligation, Description of Payment Terms	30
Maximum
Disaggregation of Revenue [Line Items]
Revenue, Performance Obligation, Description of Payment Terms	60 days
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-09-28
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	12 months