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Operating Segments and Geographic Data (Financial Information and Significant Segment Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 26, 2025	Sep. 27, 2024	Sep. 29, 2023
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contract with customer	$ 1,349,130	$ 1,273,721	$ 1,299,744
Research and development	261,792	263,663	271,523
Sales and marketing	360,711	334,460	354,364
General and administrative	286,529	270,392	258,477
Restructuring charges	15,007	6,384	47,061
Stock-based compensation	128,514	119,825	118,486
Amortization of acquisition-related intangibles	45,300	33,200	28,600
Interest income/(expense), net	15,376	34,077	28,086
Other income, net	23,150	20,076	6,214
Provision for income taxes	46,993	48,163	48,409
Net income including controlling interest	256,492	264,316	201,644
Net income attributable to Dolby Laboratories, Inc.	255,018	261,825	200,656
Licensing
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contract with customer	1,248,017	1,181,794	1,197,930
Cost of revenue	83,619	67,204	64,890
Products and services
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contract with customer	101,113	91,927	101,814
Cost of revenue	76,513	73,292	87,676
Nonrelated Party
Segment Reporting, Revenue Reconciling Item [Line Items]
Less: Net income attributable to noncontrolling interest	(1,474)	(2,491)	(988)
Reportable Segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contract with customer	1,349,130	1,273,721	1,299,744
Research and development	223,292	225,449	231,798
Sales and marketing	314,466	291,508	311,189
General and administrative	235,254	222,922	218,028
Restructuring charges	15,007	6,384	47,061
Stock-based compensation	128,514	119,825	118,486
Amortization of acquisition-related intangibles	40,856	15,552	10,056
Interest income/(expense), net	(15,376)	(34,077)	(28,086)
Equity method investees’ net income	(24,065)	(14,212)	(5,145)
Other income, net	(891)	(5,864)	(1,069)
Provision for income taxes	46,993	48,163	48,409
Net income including controlling interest	256,492	264,316	201,644
Net income attributable to Dolby Laboratories, Inc.	255,018	261,825	200,656
Reportable Segment | Licensing
Segment Reporting, Revenue Reconciling Item [Line Items]
Cost of revenue	56,907	64,314	64,642
Reportable Segment | Products and services
Segment Reporting, Revenue Reconciling Item [Line Items]
Cost of revenue	71,681	69,441	82,731
Reportable Segment | Nonrelated Party
Segment Reporting, Revenue Reconciling Item [Line Items]
Less: Net income attributable to noncontrolling interest	$ (1,474)	$ (2,491)	$ (988)

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