Reportable Segments - Summary of Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 29, 2025	Jun. 30, 2024	Jun. 29, 2025	Jun. 30, 2024	Sep. 29, 2024
Segment Reporting Information [Line Items]
Revenue	$ 1,369,816	$ 1,344,323	$ 4,112,490	$ 3,824,205
Income from operations	164,986	128,630	227,114	357,395
Total Assets	4,353,447		4,353,447		$ 4,192,676
Operating segments | GSG
Segment Reporting Information [Line Items]
Revenue	673,022	640,553	2,086,229	1,812,721
Income from operations	90,726	71,518	246,112	198,652
Total Assets	703,419		703,419		658,493
Operating segments | CIG
Segment Reporting Information [Line Items]
Revenue	715,746	723,617	2,082,818	2,063,879
Income from operations	96,103	86,465	250,550	233,821
Total Assets	1,109,686		1,109,686		1,059,915
Elimination of inter-segment revenue
Segment Reporting Information [Line Items]
Revenue	(18,952)	(19,847)	(56,557)	(52,395)
Corporate
Segment Reporting Information [Line Items]
Income from operations	(21,843)	$ (29,353)	(269,548)	$ (75,078)
Total Assets	$ 2,540,342		$ 2,540,342		$ 2,474,268