Goodwill and Intangible Assets - Summary of Goodwill (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jul. 01, 2024	Jun. 29, 2025	Jun. 30, 2024	Jun. 29, 2025	Jun. 30, 2024
Goodwill
Balance at beginning of the period				$ 2,046,569
Acquisition activity				115,145
Goodwill impairment	$ 0	$ 0	$ 0	(92,416)	$ 0
Translation adjustments				15,574
Balance at end of the period		2,084,872		2,084,872
GSG
Goodwill
Balance at beginning of the period				750,817
Acquisition activity				0
Goodwill impairment				(92,416)
Translation adjustments				1,730
Balance at end of the period		660,131		660,131
CIG
Goodwill
Balance at beginning of the period				1,295,752
Acquisition activity				115,145
Goodwill impairment				0
Translation adjustments				13,844
Balance at end of the period		$ 1,424,741		$ 1,424,741