Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jul. 01, 2018	Jul. 01, 2018
Goodwill
Balance at beginning of the period		$ 740,886
Acquisition activity		90,715
Divestiture activity	$ (12,200)	(12,160)
Translation and other		(23,689)
Balance at end of the period	795,752	795,752
GSG
Goodwill
Balance at beginning of the period		361,761
Acquisition activity		28,681
Divestiture activity		0
Translation and other		(1,568)
Balance at end of the period	388,874	388,874
CIG
Goodwill
Balance at beginning of the period		379,125
Acquisition activity		62,034
Divestiture activity		(12,160)
Translation and other		(22,121)
Balance at end of the period	$ 406,878	$ 406,878