Goodwill and Intangible Assets (Schedule of Intangible Assets Excluding Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 02, 2020	Sep. 27, 2019
Intangible Assets Excluding Goodwill [Line Items]
Goodwill	$ 1,189,800	$ 1,189,800
Gross carrying amount	166,600	182,400
Accumulated amortization	(113,100)	(74,500)
Net carrying amount	$ 53,500	107,900
Customer Relationships [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted average amortization period (years)	5 years
Gross carrying amount	$ 18,200	25,600
Accumulated amortization	(15,800)	(19,500)
Net carrying amount	$ 2,400	6,100
Developed Technology and Other [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted average amortization period (years)	3 years 9 months 18 days
Gross carrying amount	$ 101,000	94,400
Accumulated amortization	(81,600)	(48,900)
Net carrying amount	19,400	45,500
Trademarks [Member]
Intangible Assets Excluding Goodwill [Line Items]
Gross carrying amount	1,600	1,600
Accumulated amortization	(1,500)	(1,300)
Net carrying amount	$ 100	300
Licensing Agreements [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted average amortization period (years)	3 years
Gross carrying amount	$ 26,300	24,900
Accumulated amortization	(14,200)	(4,800)
Net carrying amount	12,100	20,100
Accrued Liabilities	11,500	20,100
In Process Research and Development [Member]
Intangible Assets Excluding Goodwill [Line Items]
Gross carrying amount	19,500	35,900
Accumulated amortization	0	0
Net carrying amount	$ 19,500	$ 35,900
Trade Names [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted average amortization period (years)	3 years