Goodwill and Intangible Assets - Goodwill (Details) $ in Thousands	3 Months Ended
	Dec. 29, 2019 USD ($)
Goodwill
Balance at beginning of the period	$ 924,820
Translation	12,248
Balance at end of the period	937,068
GSG
Goodwill
Balance at beginning of the period	441,802
Translation	2,502
Balance at end of the period	444,304
CIG
Goodwill
Balance at beginning of the period	483,018
Translation	9,746
Balance at end of the period	$ 492,764