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	171,933			171,659		171,659	274
Other comprehensive loss, net of tax	1,155				1,149	1,149	6
Distributions to controlling interest	(1,014)						1,014
Stock-based compensation expense	40,717		40,717			40,717
Shares repurchased (in shares)		(3,000)
Repurchase of common stock	(197,880)		(113,321)	(84,556)		(197,880)
Cash dividends declared and paid on common stock	(39,035)			(39,035)		(39,035)
Common stock issued under employee stock plans (in shares)								1,000
Common stock issued under employee stock plans	27,158		27,157			27,158
Tax withholdings on vesting of restricted stock (in shares)								0
Tax withholdings on vesting of restricted stock	(20,680)					(20,680)			$ (20,680)
Ending balance (in shares) at Mar. 29, 2019		100,000
Ending balance at Mar. 29, 2019	2,352,857		0	2,361,607	(14,683)	2,347,024	5,833
Beginning balance (in shares) at Dec. 28, 2018		101,000
Beginning balance at Dec. 28, 2018	2,348,954		0	2,361,843	(18,639)	2,343,305	5,649
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	73,575			73,440		73,440	135
Other comprehensive loss, net of tax	4,113				3,956	3,956	157
Distributions to controlling interest	(108)						108
Stock-based compensation expense	19,235		19,235			19,235
Shares repurchased (in shares)		(3,000)
Repurchase of common stock	(85,335)		(31,118)	(54,214)		(85,335)
Cash dividends declared and paid on common stock	(19,462)			(19,462)		(19,462)
Common stock issued under employee stock plans (in shares)								1,000
Common stock issued under employee stock plans	12,886		12,885			12,886
Tax withholdings on vesting of restricted stock (in shares)								1,000
Tax withholdings on vesting of restricted stock	(1,001)					(1,001)	0		(1,002)
Ending balance (in shares) at Mar. 29, 2019		100,000
Ending balance at Mar. 29, 2019	2,352,857		0	2,361,607	(14,683)	2,347,024	5,833
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
Ending balance (in shares) at Dec. 27, 2019		99,000
Ending balance at Dec. 27, 2019	2,338,701		0	2,351,251	(18,060)	2,333,290	5,411
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	137,265			137,249		137,249	16
Other comprehensive loss, net of tax	(11,184)				(10,990)	(10,990)	(194)
Distributions to controlling interest	(283)						(283)
Stock-based compensation expense	$ 43,565		43,565			43,565
Shares repurchased (in shares)	(1,447,523)	(1,000)
Repurchase of common stock	$ (101,672)		(76,456)	(25,215)		(101,672)
Cash dividends declared and paid on common stock	(44,336)			(44,336)		(44,336)
Common stock issued under employee stock plans	53,986	$ 1	53,985			53,986
Tax withholdings on vesting of restricted stock	(21,094)					(21,094)			(21,094)
Ending balance (in shares) at Mar. 27, 2020		99,000
Ending balance at Mar. 27, 2020	2,369,277		0	2,395,575	(31,615)	2,364,059	5,218
Beginning balance (in shares) at Dec. 27, 2019		99,000
Beginning balance at Dec. 27, 2019	2,338,701		0	2,351,251	(18,060)	2,333,290	5,411
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	88,674			88,496		88,496	178
Other comprehensive loss, net of tax	(13,926)				(13,555)	(13,555)	(371)
Distributions to controlling interest	0						0
Stock-based compensation expense	20,951		20,951			20,951
Shares repurchased (in shares)		(1,000)
Repurchase of common stock	(71,669)		(49,751)	(21,917)		(71,669)
Cash dividends declared and paid on common stock	(22,255)			(22,255)		(22,255)
Common stock issued under employee stock plans	29,613	$ 1	29,612			29,613
Tax withholdings on vesting of restricted stock	(812)				0	(812)	0		$ (812)
Ending balance (in shares) at Mar. 27, 2020		99,000
Ending balance at Mar. 27, 2020	$ 2,369,277		$ 0	$ 2,395,575	$ (31,615)	$ 2,364,059	$ 5,218