Goodwill and Intangible Assets Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 25, 2020	Sep. 24, 2021
Finite-Lived Intangible Assets [Line Items]
Cost	$ 442,975		$ 432,074
Accumulated Amortization	(317,171)		(309,184)
Total	125,804		122,890
Purchases of intangible assets	$ 11,400
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	16 years
Amortization of Intangible Assets	$ 8,000	$ 7,300
Acquired Patents And Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	354,197		343,280
Accumulated Amortization	(240,438)		(233,789)
Total	113,759		109,491
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	65,822		65,822
Accumulated Amortization	(53,927)		(52,730)
Total	11,895		13,092
Other Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	22,956		22,972
Accumulated Amortization	(22,806)		(22,665)
Total	$ 150		$ 307