Goodwill and Intangible Assets (Schedule Of Intangible Assets Subject To Amortization) (Details) - USD ($) $ in Thousands	6 Months Ended
	Apr. 02, 2021	Oct. 02, 2020
Finite-Lived Intangible Assets [Line Items]
Document Period End Date	Apr. 02, 2021
Accumulated Amortization	$ (89,000)	$ (113,100)
Total intangible assets, Gross Carrying Amount	128,100	166,600
Total intangible assets, Net Carrying Amount	$ 39,100	53,500
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Years)	5 years
Finite-Lived Intangible Assets, Gross	$ 18,200	18,200
Accumulated Amortization	(17,600)	(15,800)
Net Carrying Amount	$ 600	2,400
Technology-Based Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Years)	4 years 7 months 6 days
Finite-Lived Intangible Assets, Gross	$ 76,700	101,000
Accumulated Amortization	(52,000)	(81,600)
Net Carrying Amount	$ 24,700	19,400
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Years)	3 years
Finite-Lived Intangible Assets, Gross	$ 0	1,600
Accumulated Amortization	0	(1,500)
Net Carrying Amount	$ 0	100
Computer Software, Intangible Asset [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Years)	3 years 1 month 6 days
Finite-Lived Intangible Assets, Gross	$ 29,400	26,300
Accumulated Amortization	(19,400)	(14,200)
Net Carrying Amount	10,000	12,100
In Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	3,800	19,500
Accumulated Amortization	0	0
Net Carrying Amount	$ 3,800	$ 19,500