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Revenue Recognition (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 26, 2025	Sep. 27, 2024	Sep. 29, 2023
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 1,349,130	$ 1,273,721	$ 1,299,744
Revenue from contract with customer, percent	100.00%	100.00%	100.00%
United States
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 496,990	$ 450,265	$ 466,030
Revenue from contract with customer, percent	37.00%	35.00%	36.00%
International
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 852,140	$ 823,456
Revenue from contract with customer, percent	63.00%	65.00%	64.00%
Licensing
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 1,248,017	$ 1,181,794	$ 1,197,930
Revenue from contract with customer, percent	93.00%	93.00%	92.00%
Revenue from contract with customer, licensing percent	100.00%	100.00%	100.00%
Products and services
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 101,113	$ 91,927	$ 101,814
Revenue from contract with customer, percent	7.00%	7.00%	8.00%
Broadcast
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 428,471	$ 409,105	$ 451,719
Revenue from contract with customer, licensing percent	34.00%	35.00%	38.00%
Mobile
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 268,568	$ 235,774	$ 243,897
Revenue from contract with customer, licensing percent	22.00%	20.00%	20.00%
CE
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 150,704	$ 165,817	$ 170,197
Revenue from contract with customer, licensing percent	12.00%	14.00%	14.00%
PC
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 151,894	$ 141,300	$ 124,362
Revenue from contract with customer, licensing percent	12.00%	12.00%	10.00%
Other
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 248,380	$ 229,798	$ 207,755
Revenue from contract with customer, licensing percent	20.00%	19.00%	18.00%

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