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Revenue Recognition (Schedule of Disaggregation of Revenue) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023 USD ($)	Jul. 01, 2022 USD ($)	Jun. 30, 2023 USD ($) country	Jul. 01, 2022 USD ($)
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 298,370	$ 289,585	$ 1,009,182	$ 975,589
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	$ 84,371	$ 78,471	$ 361,715	$ 375,680
Revenue from contract with customer, percent	28.00%	27.00%	36.00%	39.00%
International
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 213,999	$ 211,114	$ 647,467	$ 599,909
Revenue from contract with customer, percent	72.00%	73.00%	64.00%	61.00%
Licensing
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 273,108	$ 269,289	$ 932,727	$ 915,406
Revenue from contract with customer, percent	92.00%	93.00%	92.00%	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	$ 25,262	$ 20,296	$ 76,455	$ 60,183
Revenue from contract with customer, percent	8.00%	7.00%	8.00%	6.00%
Broadcast
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 102,966	$ 99,327	$ 349,271	$ 325,441
Revenue from contract with customer, licensing percent	38.00%	37.00%	37.00%	36.00%
Mobile
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 50,363	$ 63,237	$ 207,775	$ 204,212
Revenue from contract with customer, licensing percent	18.00%	23.00%	22.00%	22.00%
CE
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 34,417	$ 38,663	$ 128,515	$ 150,192
Revenue from contract with customer, licensing percent	13.00%	14.00%	14.00%	16.00%
PC
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 29,489	$ 26,947	$ 97,122	$ 119,190
Revenue from contract with customer, licensing percent	11.00%	10.00%	10.00%	13.00%
Other
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 55,873	$ 41,115	$ 150,044	$ 116,371
Revenue from contract with customer, licensing percent	20.00%	16.00%	17.00%	13.00%

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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