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Revenue Recognition (Schedule of Disaggregation of Revenue) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023 USD ($)	Apr. 01, 2022 USD ($)	Mar. 31, 2023 USD ($) country	Apr. 01, 2022 USD ($)
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 375,891	$ 334,371	$ 710,812	$ 686,004
Revenue from contract with customer, percent	100.00%	100.00%	100.00%	100.00%
Countries technologies are licensed in | country			70
United States
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 177,082	$ 173,287	$ 277,344	$ 297,209
Revenue from contract with customer, percent	47.00%	52.00%	39.00%	43.00%
International
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 198,809	$ 161,084	$ 433,468	$ 388,795
Revenue from contract with customer, percent	53.00%	48.00%	61.00%	57.00%
Licensing
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 351,608	$ 313,833	$ 659,619	$ 646,117
Revenue from contract with customer, percent	94.00%	94.00%	93.00%	94.00%
Revenue from contract with customer, licensing percent	100.00%	100.00%	100.00%	100.00%
Products and services
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 24,283	$ 20,538	$ 51,193	$ 39,887
Revenue from contract with customer, percent	6.00%	6.00%	7.00%	6.00%
Broadcast
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 128,971	$ 104,481	$ 246,305	$ 226,114
Revenue from contract with customer, licensing percent	37.00%	33.00%	37.00%	35.00%
Mobile
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 93,126	$ 66,055	$ 157,412	$ 140,975
Revenue from contract with customer, licensing percent	26.00%	21.00%	24.00%	22.00%
CE
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 39,015	$ 53,956	$ 94,098	$ 111,529
Revenue from contract with customer, licensing percent	12.00%	17.00%	14.00%	17.00%
PC
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 43,347	$ 57,466	$ 67,633	$ 92,243
Revenue from contract with customer, licensing percent	12.00%	18.00%	10.00%	14.00%
Other
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 47,149	$ 31,875	$ 94,171	$ 75,256
Revenue from contract with customer, licensing percent	13.00%	11.00%	15.00%	12.00%

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