Joint Ventures, VIEs and Other Investments - Schedule of Summarized Financial Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 26, 2025	Sep. 27, 2024	Sep. 29, 2023
Schedule of Equity Method Investments [Line Items]
Current assets	$ 4,359,319	$ 4,895,580
Total assets	11,252,535	11,759,005
Current liabilities	3,350,899	4,079,741
Gross profit	2,984,934	2,832,756	$ 2,710,860
Net earnings	303,956	852,643	719,656
Consolidated Entities
Schedule of Equity Method Investments [Line Items]
Revenue	401,900	472,000	485,500
Direct cost of contracts	(392,400)	(431,200)	(443,100)
Gross profit	9,500	40,800	42,400
Net earnings	9,500	40,800	$ 42,400
VIE, Primary Beneficiary | Consolidated Entities
Schedule of Equity Method Investments [Line Items]
Current assets	163,400	161,900
Total assets	163,400	161,900
Current liabilities	144,700	122,700
Total liabilities	$ 144,700	$ 122,700