Interim Condensed Consolidated Statements Of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Total Stockholders' Equity - Dolby Laboratories, Inc.	Controlling Interest	Class A Common Stock [Member] Common Stock	Class A Common Stock [Member] Additional Paid-In Capital
Beginning balance (in shares) at Sep. 27, 2019		99,000
Beginning balance at Sep. 27, 2019	$ 2,313,030		$ 0	$ 2,327,877	$ (20,625)	$ 2,307,351	$ 5,679
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	204,643			204,534		204,534	109
Other comprehensive income/(loss), net of tax	3,529				3,504	3,504	25
Distributions to controlling interest	(283)						(283)
Stock-based compensation expense	64,850		64,850			64,850
Shares repurchased (in shares)		(2,000)
Repurchase of common stock	(128,753)		(111,168)	(17,583)		(128,753)
Cash dividends declared and paid on common stock	(66,439)			(66,439)		(66,439)
Common stock issued under employee stock plans (in shares)								2,000
Common stock issued under employee stock plans	68,289		68,287			68,289
Tax withholdings on vesting of restricted stock (in shares)								0
Tax withholdings on vesting of restricted stock	(21,969)					(21,969)			$ (21,969)
Ending balance (in shares) at Jun. 26, 2020		99,000
Ending balance at Jun. 26, 2020	2,436,897		0	2,448,389	(17,121)	2,431,367	5,530
Beginning balance (in shares) at Mar. 27, 2020		99,000
Beginning balance at Mar. 27, 2020	2,369,277		0	2,395,575	(31,615)	2,364,059	5,218
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	67,378			67,285		67,285	93
Other comprehensive income/(loss), net of tax	14,713				14,494	14,494	219
Stock-based compensation expense	21,285		21,285			21,285
Shares repurchased (in shares)		(1,000)
Repurchase of common stock	(27,081)		(34,712)	7,632		(27,081)
Cash dividends declared and paid on common stock	(22,103)			(22,103)		(22,103)
Common stock issued under employee stock plans (in shares)								1,000
Common stock issued under employee stock plans	14,303		14,302			14,303
Tax withholdings on vesting of restricted stock (in shares)								0
Tax withholdings on vesting of restricted stock	(875)					(875)	0		(875)
Ending balance (in shares) at Jun. 26, 2020		99,000
Ending balance at Jun. 26, 2020	2,436,897		0	2,448,389	(17,121)	2,431,367	5,530
Beginning balance (in shares) at Sep. 25, 2020		99,000
Beginning balance at Sep. 25, 2020	2,438,405		0	2,443,138	(10,594)	2,432,643	5,762
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	273,595			266,036		266,036	7,559
Other comprehensive income/(loss), net of tax	5,902				5,562	5,562	340
Distributions to controlling interest	(7,362)						(7,362)
Stock-based compensation expense	$ 75,562		75,562			75,562
Shares repurchased (in shares)	(1,611,650)	(2,000)
Repurchase of common stock	$ (149,764)		(133,918)	(15,844)		(149,764)
Cash dividends declared and paid on common stock	(66,883)			(66,883)		(66,883)
Common stock issued under employee stock plans	89,148	$ 3	89,145			89,148
Tax withholdings on vesting of restricted stock	(30,789)					(30,789)			(30,789)
Ending balance (in shares) at Jun. 25, 2021		100,000
Ending balance at Jun. 25, 2021	2,627,814		0	2,626,447	(5,032)	2,621,515	6,299
Beginning balance (in shares) at Mar. 26, 2021		100,000
Beginning balance at Mar. 26, 2021	2,594,220		0	2,591,870	(4,039)	2,587,931	6,289
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	54,560			54,621		54,621	(61)
Other comprehensive income/(loss), net of tax	(922)				(993)	(993)	71
Stock-based compensation expense	24,836		24,836			24,836
Shares repurchased (in shares)		(1,000)
Repurchase of common stock	(38,989)		(41,253)	2,265		(38,989)
Cash dividends declared and paid on common stock	(22,309)			(22,309)		(22,309)
Common stock issued under employee stock plans	17,991	$ 1	17,990			17,991
Tax withholdings on vesting of restricted stock (in shares)								0
Tax withholdings on vesting of restricted stock	(1,573)				0	(1,573)	0		$ (1,573)
Ending balance (in shares) at Jun. 25, 2021		100,000
Ending balance at Jun. 25, 2021	$ 2,627,814		$ 0	$ 2,626,447	$ (5,032)	$ 2,621,515	$ 6,299