Interim Condensed Consolidated Statements Of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income/(Loss)	Total 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. 28, 2018		102,000
Beginning balance at Sep. 28, 2018	$ 2,370,503		$ 66,127	$ 2,313,539	$ (15,832)	$ 2,363,936	$ 6,567
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	211,570			211,233		211,233	337
Other comprehensive loss, net of tax	1,202				1,336	1,336	(134)
Distributions to controlling interest	(1,015)						1,015
Stock-based compensation expense	59,580		59,580			59,580
Shares repurchased (in shares)		(4,000)
Repurchase of common stock	(286,512)		(148,972)	(137,536)		(286,512)
Cash dividends declared and paid on common stock	(58,318)			(58,318)		(58,318)
Common stock issued under employee stock plans (in shares)								1,000
Common stock issued under employee stock plans	45,027		45,026			45,027
Tax withholdings on vesting of restricted stock (in shares)								0
Tax withholdings on vesting of restricted stock	(21,761)					(21,761)			$ (21,761)
Ending balance (in shares) at Jun. 28, 2019		99,000
Ending balance at Jun. 28, 2019	2,320,276		0	2,328,918	(14,496)	2,314,521	5,755
Beginning balance (in shares) at Mar. 29, 2019		100,000
Beginning balance at Mar. 29, 2019	2,352,857		0	2,361,607	(14,683)	2,347,024	5,833
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	39,637			39,574		39,574	63
Other comprehensive loss, net of tax	47				187	187	(140)
Distributions to controlling interest	(1)						1
Stock-based compensation expense	18,863		18,863			18,863
Shares repurchased (in shares)		(1,000)
Repurchase of common stock	(88,632)		(35,651)	(52,980)		(88,632)
Cash dividends declared and paid on common stock	(19,283)			(19,283)		(19,283)
Common stock issued under employee stock plans (in shares)								0
Common stock issued under employee stock plans	17,869		17,869			17,869
Tax withholdings on vesting of restricted stock (in shares)								0
Tax withholdings on vesting of restricted stock	(1,081)					(1,081)	0		(1,081)
Ending balance (in shares) at Jun. 28, 2019		99,000
Ending balance at Jun. 28, 2019	2,320,276		0	2,328,918	(14,496)	2,314,521	5,755
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 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)	(1,921,863)	(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	68,289	$ 2	68,287			68,289
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 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	14,303	$ 1	14,302			14,303
Tax withholdings on vesting of restricted stock	(875)				0	(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