Goodwill and Intangible Assets - Goodwill (Details) $ in Thousands	3 Months Ended
	Dec. 30, 2018 USD ($)
Goodwill
Balance at beginning of the period	$ 798,820
Translation and other	(16,256)
Balance at end of the period	782,564
GSG
Goodwill
Balance at beginning of the period	389,741
Translation and other	(3,563)
Balance at end of the period	386,178
CIG
Goodwill
Balance at beginning of the period	409,079
Translation and other	(12,693)
Balance at end of the period	$ 396,386