Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Sep. 30, 2017
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	$ 264,488		$ 272,961
Accumulated Amortization	(107,124)		(82,934)
Net including IPRD	157,364		190,027
Amortization expense for intangible assets	45,638	$ 44,303
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2018 (remainder)	14,700
2019	56,129
2020	48,811
2021	17,058
2022	5,593
2023	3,054
Thereafter	7,155
Net excluding IPRD	152,500
Existing technology
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	203,343		208,341
Accumulated Amortization	(83,460)		(66,793)
Net including IPRD	119,883		141,548
Patents
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	0		330
Accumulated Amortization	0		(58)
Net including IPRD	0		272
Customer relationships
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	50,393		51,687
Accumulated Amortization	(20,347)		(14,259)
Net including IPRD	30,046		37,428
Trade name
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	5,888		6,171
Accumulated Amortization	(3,317)		(1,824)
Net including IPRD	2,571		4,347
In-process research & development
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	4,864		6,432
Accumulated Amortization	0		0
Net including IPRD	4,864		$ 6,432
Foreign Exchange
Finite-Lived Intangible Assets, Net [Abstract]
Amortization expense for intangible assets	$ 2,400	$ 2,100