Goodwill and Intangible Assets Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jul. 01, 2016	Jan. 01, 2016	Jun. 30, 2017	Jul. 01, 2016	Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items]
Cost	$ 378,826				$ 378,826		$ 373,361
Accumulated Amortization	(182,332)				(182,332)		(158,019)
Total	196,494				196,494		215,342
Purchases of intangible assets		$ 5	$ 0	$ 100	5,250	$ 118,770
Weighted average useful life		18 years	18 years	9 years
Amortization of Intangible Assets	7,300		$ 8,200		24,000	24,900
Acquired Patents And Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	299,274				299,274		293,824
Accumulated Amortization	(122,393)				(122,393)		(101,711)
Total	176,881				176,881		192,113
Purchases of intangible assets						$ 105,000
Weighted average useful life						9 years
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	56,828				56,828		56,821
Accumulated Amortization	(37,691)				(37,691)		(34,113)
Total	19,137				19,137		22,708
Other Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	22,724				22,724		22,716
Accumulated Amortization	(22,248)				(22,248)		(22,195)
Total	$ 476				$ 476		$ 521