Consolidated Statements Of Stockholders' Equity - USD ($) $ in Thousands	Total	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Total Dolby Laboratories,Inc.[Member]	Controlling Interest [Member]	Common Class A [Member] Common Stock [Member]	Common Class B [Member] Common Stock [Member]
Beginning balance, shares at Sep. 28, 2018							63,979,000	39,261,000
Beginning balance, value at Sep. 28, 2018	$ 2,370,503	$ 66,127	$ 2,313,539	$ (15,832)	$ 2,363,936	$ 6,567	$ 61	$ 41
Net income	255,505		255,151		255,151	354
Other comprehensive loss, net of tax	(5,020)			(4,793)	(4,793)	(227)
Distributions to controlling interest	(1,015)					(1,015)
Stock-based compensation expense	76,580	76,580			76,580
Repurchase of common stock, shares							(5,268,000)
Repurchase of common stock, value	(340,585)	(177,264)	(163,317)		(340,585)		$ (4)
Cash dividends declared and paid on common stock	(77,496)		(77,496)		(77,496)
Class A common stock issued under employee stock plans, shares							2,514,000
Class A common stock issued under employee stock plans, value	57,346	57,345			57,346		$ 1
Shares repurchased for tax witholdings on vesting of restricted stock, shares							345,000
Shares repurchased for tax witholdings on vesting of restricted stock, value	(22,788)	(22,788)			(22,788)
Transfer of Class B common stock to Class A common stock, shares							(3,031,000)	3,031,000
Ending balance, shares at Sep. 27, 2019							63,911,000	36,230,000
Ending balance, value at Sep. 27, 2019	2,313,030	0	2,327,877	(20,625)	2,307,351	5,679	$ 58	$ 41
Net income	231,619		231,363		231,363	256
Other comprehensive loss, net of tax	10,141			10,031	10,031	110
Distributions to controlling interest	(283)					(283)
Stock-based compensation expense	86,628	86,628			86,628
Repurchase of common stock, shares							(2,564,000)
Repurchase of common stock, value	(173,742)	(146,218)	(27,521)		(173,742)		$ (3)
Cash dividends declared and paid on common stock	(88,581)		(88,581)		(88,581)
Class A common stock issued under employee stock plans, shares							3,063,000
Class A common stock issued under employee stock plans, value	82,658	82,655			82,658		$ 3
Shares repurchased for tax witholdings on vesting of restricted stock, shares							343,000
Shares repurchased for tax witholdings on vesting of restricted stock, value	(23,065)	(23,065)			(23,065)
Transfer of Class B common stock to Class A common stock, shares							(101,000)	101,000
Ending balance, shares at Sep. 25, 2020							64,168,000	36,129,000
Ending balance, value at Sep. 25, 2020	2,438,405	0	2,443,138	(10,594)	2,432,643	5,762	$ 58	$ 41
Net income	317,823		310,227		310,227	7,596
Other comprehensive loss, net of tax	821			564	564	257
Distributions to controlling interest	(7,362)					(7,362)
Stock-based compensation expense	$ 99,698	99,698			99,698
Repurchase of common stock, shares	(2,583,866)						(2,584,000)
Repurchase of common stock, value	$ (245,864)	(189,577)	(56,284)		(245,864)		$ (3)
Cash dividends declared and paid on common stock	(89,172)		(89,172)		(89,172)
Class A common stock issued under employee stock plans, shares							3,714,000
Class A common stock issued under employee stock plans, value	122,088	122,084			122,088		$ 4
Shares repurchased for tax witholdings on vesting of restricted stock, shares							354,000
Shares repurchased for tax witholdings on vesting of restricted stock, value	(32,205)	(32,205)			(32,205)
Transfer of Class B common stock to Class A common stock, shares							(42,000)	42,000
Ending balance, shares at Sep. 24, 2021							64,986,000	36,087,000
Ending balance, value at Sep. 24, 2021	$ 2,604,232	$ 0	$ 2,607,909	$ (10,030)	$ 2,597,979	$ 6,253	$ 59	$ 41