Revenue and Contract Balances - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 30, 2025	Mar. 31, 2024	Mar. 30, 2025	Mar. 31, 2024	Sep. 29, 2024
Revenue from Contract with Customer [Abstract]
Contract liability revenue recognized during the period			$ 175,000	$ 177,000
Net favorable (unfavorable) revenue and operating income adjustments	$ 3,900	$ 4,100	6,600	$ 9,900
Liabilities for anticipated losses	12,600		12,600		$ 15,100
Estimated cost to complete the related contracts	82,000		$ 82,000		$ 101,000
Period for billing and collecting unbilled receivables			12 months
Remaining unsatisfied performance obligation	$ 4,262,879		$ 4,262,879
Remaining performance obligation, termination notice period one			30 days
Remaining performance obligation, termination notice period two			60 days
Remaining performance obligation, termination notice period three			90 days