Dolby Laboratories (DLB) 10-Q 29 Jan 20 2020 Q1 Quarterly report Financial data

Cover

Cover - shares	3 Months Ended
	Dec. 27, 2019	Jan. 24, 2020
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Dec. 27, 2019
Document Transition Report	false
Entity File Number	001-32431
Entity Registrant Name	DOLBY LABORATORIES, INC.
Entity Central Index Key	0001308547
Current Fiscal Year End Date	--09-25
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	90-0199783
Entity Address, Address Line One	1275 Market Street
Entity Address, City or Town	San Francisco
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94103-1410
City Area Code	415
Local Phone Number	558-0200
Title of 12(b) Security	Class A common stock, $0.001 par value
Trading Symbol	DLB
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Class A Common Stock [Member]
Entity Common Stock, Shares Outstanding		64,744,160
Class B Common Stock [Member]
Entity Common Stock, Shares Outstanding		36,224,820

Interim Condensed Consolidated

Interim Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 27, 2019	Sep. 27, 2019
Current assets:
Cash and cash equivalents	$ 741,429	$ 797,210
Restricted cash	11,726	8,383
Short-term investments	170,234	119,146
Accounts receivable, net of allowance for doubtful accounts of $8,898 and $9,775	191,001	189,115
Contract assets	204,963	195,651
Inventories, net	29,104	32,331
Prepaid expenses and other current assets	52,551	39,704
Total current assets	1,401,008	1,381,540
Long-term investments	141,720	179,587
Property, plant, and equipment, net	549,495	537,432
Operating lease right-of-use assets	71,071
Intangible assets, net	175,981	180,891
Goodwill	335,443	334,829
Deferred taxes	123,284	114,075
Other non-current assets	95,282	93,395
Total assets	2,893,284	2,821,749
Current liabilities:
Accounts payable	13,700	15,212
Accrued liabilities	242,052	268,144
Income taxes payable	2,318	3,506
Contract liabilities	19,785	19,991
Operating lease liabilities	15,604
Total current liabilities	293,459	306,853
Non-current contract liabilities	23,917	24,404
Non-current operating lease liabilities	57,985
Other non-current liabilities	179,222	177,462
Total liabilities	554,583	508,719
Stockholders’ equity:
Retained earnings	2,351,251	2,327,877
Accumulated other comprehensive (loss)	(18,060)	(20,625)
Total stockholders’ equity – Dolby Laboratories, Inc.	2,333,290	2,307,351
Controlling interest	5,411	5,679
Total stockholders’ equity	2,338,701	2,313,030
Total liabilities and stockholders’ equity	2,893,284	2,821,749
Class A, $0.001 par value, one vote per share, 500,000,000 shares authorized: 64,649,011 shares issued and outstanding at December 27, 2019 and 63,911,270 at September 27, 2019
Stockholders’ equity:
Common stock	58	58
Class B, $0.001 par value, ten votes per share, 500,000,000 shares authorized: 36,229,820 shares issued and outstanding at December 27, 2019 and 36,229,820 at September 27, 2019
Stockholders’ equity:
Common stock	$ 41	$ 41

Interim Condensed Consolidate_2

Interim Condensed Consolidated Balance Sheets (Parenthetical) $ in Thousands	Dec. 27, 2019USD ($)vote / shares$ / sharesshares	Sep. 27, 2019USD ($)vote / shares$ / sharesshares
Allowance for doubtful accounts | $	$ (8,898)	$ (9,775)
Class A Common Stock [Member]
Common stock, par value (usd per share) | $ / shares	$ 0.001	$ 0.001
Common stock voting right per share (votes per share) | vote / shares	1	1
Common stock, shares authorized (shares)	500,000,000	500,000,000
Common stock, shares issued (shares)	64,649,011	63,911,270
Common stock, shares outstanding (shares)	64,649,011	63,911,270
Class B Common Stock [Member]
Common stock, par value (usd per share) | $ / shares	$ 0.001	$ 0.001
Common stock voting right per share (votes per share) | vote / shares	10	10
Common stock, shares authorized (shares)	500,000,000	500,000,000
Common stock, shares issued (shares)	36,229,820	36,229,820
Common stock, shares outstanding (shares)	36,229,820	36,229,820

Interim Condensed Consolidate_3

Interim Condensed Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Revenue:
Revenue	$ 291,877	$ 302,376
Total revenue	291,877	302,376
Cost of revenue:
Total cost of revenue	37,315	38,629
Gross margin	254,562	263,747
Operating expenses:
Research and development	57,650	58,647
Sales and marketing	95,118	85,602
General and administrative	52,529	50,813
Restructuring charges	675	14
Total operating expenses	205,972	195,076
Operating income	48,590	68,671
Other income/expense:
Interest income	4,932	5,185
Interest expense	(72)	(45)
Other income, net	1,004	443
Total other income	5,864	5,583
Income before income taxes	54,454	74,254
(Provision for)/benefit from income taxes	(5,863)	24,104
Net income including controlling interest	48,591	98,358
Less: net loss/(income) attributable to controlling interest	162	(139)
Net income attributable to Dolby Laboratories, Inc.	$ 48,753	$ 98,219
Net income per share:
Basic (in usd per share)	$ 0.49	$ 0.96
Diluted (in usd per share)	$ 0.47	$ 0.93
Weighted-average shares outstanding:
Basic (in shares)	100,336	102,677
Diluted (in shares)	103,078	106,130
Related party rent expense:
Included in operating expenses	$ 70	$ 880
Included in net income attributable to controlling interest	$ (106)	$ 176
Common stock, dividends declared (in dollars per share)	$ 0.22	$ 0.19
Common Stock, Dividends, Per Share, Cash Paid	$ 0.22	$ 0.19
Licensing
Revenue:
Revenue	$ 257,683	$ 260,279
Cost of revenue:
Cost of revenue	12,342	11,397
Products and services
Revenue:
Revenue	34,194	42,097
Cost of revenue:
Cost of revenue	$ 24,973	$ 27,232

Interim Condensed Consolidate_4

Interim Condensed Consolidated Statements of Comprehensive Income Statement - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Statement of Comprehensive Income [Abstract]
Net income including controlling interest	$ 48,591	$ 98,358
Other comprehensive income:
Currency translation adjustments, net of tax of $40 and $0	3,620	(3,728)
Unrealized gain/(loss) on investments, net of tax of ($261) and $40	(1,162)	770
Unrealized gain on cash flow hedges, net of tax of ($37) and $0	284	0
Other Comprehensive Income (Loss), Net of Tax	2,742	(2,958)
Comprehensive income	51,333	95,400
Less: comprehensive (income) attributable to controlling interest	(15)	12
Comprehensive income attributable to Dolby Laboratories, Inc.	$ 51,318	$ 95,412

Interim Condensed Consolidate_5

Interim Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Statement of Comprehensive Income [Abstract]
Currency translation adjustment, tax	$ 40	$ 0
Unrealized gain (loss) on investments, tax	(261)	40
Unrealized gains on cash flow hedges, tax	$ (37)	$ 0

Interim Condensed Consolidate_6

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	98,358			98,219		98,219	139
Other comprehensive income, net of tax	(2,958)				(2,807)	(2,807)	(151)
Distributions to controlling interest	(906)						906
Stock-based compensation expense	21,482		21,482			21,482
Repurchase of common stock	(112,545)		(82,203)	(30,342)		(112,545)
Cash dividends declared and paid on common stock	(19,573)			(19,573)		(19,573)
Common stock issued under employee stock plans (in shares)								0
Common stock issued under employee stock plans	14,272		14,272			14,272
Tax withholdings on vesting of restricted stock (in shares)								(1,000)
Tax withholdings on vesting of restricted stock	(19,679)					(19,679)	0		$ (19,678)
Ending balance (in shares) at Dec. 28, 2018		101,000
Ending balance at Dec. 28, 2018	2,348,954		0	2,361,843	(18,639)	2,343,305	5,649
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	48,591			48,753		48,753	(162)
Other comprehensive income, net of tax	2,742				2,565	2,565	177
Distributions to controlling interest	(283)						(283)
Stock-based compensation expense	$ 22,614		22,614			22,614
Shares repurchased (in shares)	(432,042)	0
Repurchase of common stock	$ (30,003)		(26,705)	(3,298)		(30,003)
Cash dividends declared and paid on common stock	(22,081)			(22,081)		(22,081)
Common stock issued under employee stock plans	24,373		24,373			24,373
Tax withholdings on vesting of restricted stock	(20,282)				0	(20,282)	0		$ (20,282)
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

Interim Condensed Consolidate_7

Interim Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Operating activities:
Net income including controlling interest	$ 48,591	$ 98,358
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	20,239	20,029
Stock-based compensation	22,614	21,482
Amortization of premium on investments	160	309
Provision for doubtful accounts	575	1,605
Deferred income taxes	(9,174)	(32,571)
Restructuring charge for exit of leased facility	486	0
Other non-cash items affecting net income	(10)	3,393
Changes in operating assets and liabilities:
Accounts receivable	(2,331)	17,736
Inventories	767	(2,709)
Operating lease right-of-use assets	(8,644)
Contract assets	(9,310)	(33,519)
Prepaid expenses and other assets	(13,245)	(13,157)
Accounts payable and other liabilities	(30,785)	(26,332)
Income taxes, net	945	1,546
Contract liabilities	(724)	(678)
Operating lease liabilities	8,664
Other non-current liabilities	2,341	1,460
Net cash provided by operating activities	31,159	56,952
Investing activities:
Purchase of investments	(129,325)	(63,329)
Proceeds from sales of investment securities	97,717	32,582
Proceeds from maturities of investment securities	17,876	19,785
Purchases of property, plant and equipment	(23,385)	(18,539)
Purchases of intangible assets	(290)	(12,065)
Net cash provided by/(used in) investing activities	(37,407)	(41,566)
Financing activities:
Proceeds from issuance of common stock	24,373	14,272
Repurchase of common stock	(30,003)	(112,545)
Payment of cash dividend	(22,081)	(19,573)
Distribution to controlling interest	(283)	(906)
Shares repurchased for tax withholdings on vesting of restricted stock	(20,282)	(19,679)
Net cash used in financing activities	(48,276)	(138,431)
Effect of foreign exchange rate changes on cash and cash equivalents	2,086	(2,419)
Net increase/(decrease) in cash and cash equivalents	(52,438)	(125,464)
Cash, cash equivalents, and restricted cash at beginning of period	805,593	925,250
Cash, cash equivalents, and restricted cash at end of period	753,155	799,786
Supplemental disclosure:
Cash paid for income taxes, net of refunds received	17,999	10,722
Non-cash investing activities:
Property, plant, and equipment purchased and unpaid at period-end	(582)	6,642
Purchase consideration payable for intangibles	$ 2,610	$ 0

Basis Of Presentation

Basis Of Presentation	3 Months Ended
	Dec. 27, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis Of Presentation	Unaudited Interim Condensed Consolidated Financial Statements We have prepared the accompanying unaudited interim condensed consolidated financial statements in accordance with U.S. GAAP, and with SEC rules and regulations, which allow for certain information and footnote disclosures that are normally included in annual financial statements prepared in accordance with U.S. GAAP to be condensed or omitted. In our opinion, these unaudited interim condensed consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements for the fiscal year ended September 27, 2019 and include all adjustments necessary for fair presentation. The accompanying unaudited interim condensed consolidated financial statements should be read in conjunction with our consolidated financial statements for the fiscal year ended September 27, 2019 , which are included in our Annual Report on Form 10-K filed with the SEC. The results for the fiscal quarter ended December 27, 2019 are not necessarily indicative of the results to be expected for any subsequent quarterly or annual financial period, including the fiscal year ending September 25, 2020 . Principles of Consolidation The unaudited interim condensed consolidated financial statements include the accounts of Dolby Laboratories, Inc. and our wholly owned subsidiaries. In addition, we have consolidated the financial results of jointly owned affiliated companies in which our principal stockholder has a controlling interest. We report these controlling interests as a separate line in our consolidated statements of operations as net income attributable to controlling interest and in our consolidated balance sheets as a controlling interest. We eliminate all intercompany accounts and transactions upon consolidation. Operating Segments Since we operate as a single reporting segment, all required financial segment information is included in our unaudited interim condensed consolidated financial statements. This reflects the fact that our CODM, our Chief Executive Officer, evaluates our financial information and resources, and assesses the performance of these resources on a consolidated basis. Use of Estimates The preparation of our financial statements in accordance with U.S. GAAP requires management to make certain estimates and assumptions that affect the amounts reported and disclosed in our unaudited interim condensed consolidated financial statements and accompanying notes. Significant items subject to such estimates and assumptions include estimated shipments by our licensees for which we are owed a sales–based royalty, estimated selling prices for performance obligations within revenue arrangements; valuation allowances for accounts receivable; carrying values of inventories and certain property, plant, and equipment, goodwill and intangible assets; fair values of investments; accrued liabilities including liabilities for unrecognized tax benefits, deferred income tax assets and liabilities, and stock-based compensation. Actual results could differ from our estimates. Fiscal Year Our fiscal year is a 52 or 53 week period ending on the last Friday in September. The fiscal periods presented herein include the 13 week periods ended December 27, 2019 and December 28, 2018 . Our fiscal year ending September 25, 2020 (fiscal 2020 ) and our fiscal year ended September 27, 2019 (fiscal 2019 ) both consist of 52 weeks. Reclassifications We have reclassified certain prior period amounts within our consolidated financial statements and accompanying notes to conform to our current period presentation. These reclassifications did not affect total revenue, operating income, or net income.

Summary Of Significant Accounti

Summary Of Significant Accounting Policies	3 Months Ended
	Dec. 27, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Recently Issued Accounting Standards Adopted Standards At the beginning of fiscal 2020, we adopted the following standards: Leases. In the first quarter of fiscal 2020, we adopted ASU 2016-02, Leases (ASC 842 ) along with all subsequent applicable ASU clarifications and improvements , which requires lessees to recognize leases on balance sheet and disclose key information about leasing arrangements. We adopted ASC 842 using the modified retrospective transition method and used the effective date as the date of initial application. Consequently, financial information is not updated and the disclosures required under ASC 842 are not provided for dates and periods prior to implementation. ASC 842 provides a number of optional practical expedients in transition. We elected the “package of practical expedients,” which permits us not to reassess under ASC 842 our prior conclusions about lease identification, lease classification and initial direct costs. In addition, we account for lease and non-lease components as a single lease component. Operating leases are included in operating lease right-of-use assets, operating lease liabilities, current and non-current operating lease liabilities, and non-current operating lease liabilities on our interim condensed consolidated balance sheets. As a lessee, the adoption of ASC 842 resulted in the recording of Operating lease right-of-use ("ROU") assets and Operating lease liabilities of $62.1 million and $64.6 million , respectively, as of September 28, 2019. The difference between the operating lease assets and liabilities was recorded as an adjustment to Other non-current liabilities, primarily related to deferred rent and other lease incentives. As a lessor, the adoption of ASC 842 did not have a material impact. The adoption of ASC 842 did not impact Retained Earnings. Income Taxes: Comprehensive Income. During the first quarter of fiscal 2020, we adopted ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects From Accumulated Other Comprehensive Income, which allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Act. We elected to not reclassify the stranded tax effects to retained earnings as they were not material to Dolby's consolidated financial statements. Standards Not Yet Effective Collaborative Arrangements. In November 2018, the FASB issued ASU 2018-18, Collaborative Arrangements (Topic 808): Clarifying the Interaction between Topic 808 and Topic 606 , which clarifies that certain transactions between participants in a collaborative arrangement should be accounted for under ASC 606 when the counterparty is a customer. In addition, ASU 2018-18 precludes an entity from presenting consideration from a transaction in a collaborative arrangement as revenue from contracts with customers if the counterparty is not a customer for that transaction. This standard will be effective for Dolby beginning September 26, 2020, and we do not currently plan to early adopt. We do not believe that this standard will have a material impact on our consolidated financial statements. Financial Instruments. In June 2016, the FASB issued ASU 2016-13, Financial Instruments (Topic 326): Measurement of Credit Losses on Financial Instruments , which modifies the measurement of expected credit losses of certain financial instruments, including trade receivables, contract assets, and lease receivables. This standard will be effective for Dolby beginning September 26, 2020, and we do not currently plan to early adopt. We do not believe that this standard will have a material impact on our consolidated financial statements.

Revenue Recognition Revenue Rec

Revenue Recognition Revenue Recognition	3 Months Ended
	Dec. 27, 2019
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition We enter into revenue arrangements with our customers to license technologies, trademarks and patents for sound, imaging and voice solutions, and to sell products and services. We recognize revenue when we satisfy a performance obligation by transferring control over the use of a license, product , or service to a customer. A. Identification of the Contract or Contracts with Customers We generally determine that a contract with a customer exists upon the execution of an agreement and after consideration of collectability, which could include an evaluation of the customer's payment history, the existence of a standby letter-of-credit between the customer’s financial institution and our financial institution, public financial information, and other factors. At contract inception, we also evaluate whether two or more non-standard agreements with a customer should be combined and accounted for as a single contract. B. Identification of Performance Obligations in a Contract We generate revenues principally from the following sources, which represent performance obligations in our contracts with customers: • Licensing. We license our technologies , including patents , to a range of customers who incorporate them into their products for enhanced audio, imaging and voice functionality across broadcast, mobile, CE, PC, gaming, and other markets. • Product Sales. We design and provide audio and imaging products for the cinema, television, broadcast, communications, and entertainment industries. • Services. We provide various services to support theatrical and television production for cinema exhibition, broadcast, and home entertainment, including equipment training , mixing room alignment, equalization, as well as audio, color and light image calibration. • PCS. We provide PCS for products sold and for the equipment leased, and we support the implementation of our licensing technologies in our licensees’ products. • Equipment Leases. We collaborate with established cinema exhibitors to offer Dolby Cinema, a branded premium cinema offering for movie audiences by leasing equipment and licensing our intellectual property. We also lease hardware that facilitates the Dolby conferencing experience, including the Dolby Conference Phone, and the Dolby Voice Room solution. • Licensing Administration Fees. We generate service fees for managing patent pools on behalf of third party patent owners through our wholly-owned subsidiary, Via Licensing Corporation. Some of our revenue arrangements include multiple performance obligations, such as hardware, software, support and maintenance, and extended warranty services. We evaluate whether promised products and services are distinct performance obligations. The majority of our arrangements with multiple performance obligations pertain to our digital cinema server and processor sales that include the following distinct performance obligations to which we allocate portions of the transaction price based on their stand-alone selling price: • Digital cinema server hardware and embedded software, which is highly dependent on and highly interrelated with the hardware. Accordingly, the hardware and embedded software represent a single performance obligation. • The right to support and maintenance, which is included with the purchase of the digital cinema server hardware, is a distinct performance obligation. • The right to receive commissioning services is a distinct performance obligation within the sale of the Dolby Atmos Cinema Processor. These services consist of the review of venue designs specifying proposed speaker placement as well as calibration services performed for installed speakers to ensure optimal playback. C. Determination of Transaction Price for Performance Obligations in a Contract After identifying the distinct performance obligations, we determine the transaction price in accordance with the terms of the underlying executed contract which may include variable consideration such as discounts, rebates, refunds, rights of returns, and incentives. We assess and update, if necessary, the amount of variable consideration to which we are entitled for each reporting period. At the end of each reporting period, we estimate and accrue a liability for returns and adjustments as a reduction to revenue based on several factors, including past returns history. With the exception of our sales-based royalties, we evaluate whether a significant financing component exists when we recognize revenue in advance of customer payments that occur over time. For example, some of our licensing arrangements include payment terms greater than one year from when we transfer control of our IP to a licensee and the receipt of the final payment for that IP. If a significant financing component exists, we classify a portion of the transaction price as interest income, instead of recognizing all the transaction price as revenue. We do not adjust the transaction price for the effects of financing if, at contract inception , the period between the transfer of control to a customer and final payment is expected to be one year or less . D. Allocation of Transaction Price to Distinct Performance Obligations in a Contract For our sales-based royalties where the license is the predominant item to which the royalties relate, we present all revenues as licensing. For revenue arrangements that include multiple performance obligations, we determine the stand-alone selling price for each distinct performance obligation based on the actual selling prices made to customers. If the performance obligation is not sold separately, we estimate the stand-alone selling price. We do so by considering market conditions such as competitor pricing strategies, customer specific information and industry technology lifecycles, internal conditions such as cost and pricing practices, or applying the residual approach method when the selling price of the good, most commonly a license, is highly variable or uncertain. Once the transaction price - including any variable consideration - has been determined, we allocate the transaction price to the performance obligations identified in the contract, and recognize revenue as or when control is transferred for each distinct performance obligation. E. Revenue Recognition as Control is Transferred to a Customer We generate our licensing revenue by licensing our technologies and patents to various types of licensees, such as chip manufacturers ("implementation licensees"), consumer product manufacturers, software vendors, and communications service providers. Our revenue recognition policies for each of these arrangements are summarized below. Initial fees from implementation licensees. Implementation licensees incorporate our technologies into their chipsets that, once approved by Dolby, are available for purchase by OEMs for use in end-user products. Implementation licensees only pay us a nominal initial fee on contract execution as consideration for the ongoing services that we provide to assist in their implementation process. Revenues from these initial fees are recognized ratably over the contractual term as a component of licensing revenue. Sales-based licensing fees. In our royalty bearing licensing agreements with OEMs, control is transferred upon the later of contract execution or the contract’s effective date. We apply the royalty exception, which requires that we recognize sales-based royalties when the sales occur based on our estimates. These estimates involve the use of historical data and judgment for several key attributes including industry estimates of expected shipments, the percentage of markets using our technologies, and average sale prices. Generally, our estimates represent the current period’s shipments to which we expect our licensees to submit royalty statements in the following quarter. Upon receipt of royalty statements from the licensees with the actual reporting of sales-based royalties that we estimated previously, we record a favorable or unfavorable adjustment based on the difference, if any, between estimated and actual sales. In the first quarter of fiscal 2020 , we recorded a favorable adjustment of approximately $9 million , which was primarily related to July through September shipments and largely based on actual royalty statements received from licensees. Fixed and guaranteed licensing fees. In certain cases, our arrangements require the licensee to pay fixed, non-refundable fees independent of the actual number of units they may distribute in the future. In these cases, control is transferred and fees are recognized upon the later of contract execution or the effective date. Additionally and separate from initial fees from implementation licensees, our sales- and usage-based licensing agreements include a nominal fee, which is also recognized at a point in time in which control of the IP has been transferred. Revenues from these arrangements are included as a component of licensing revenue. Recoveries. Through our contract compliance efforts, we identify under-reported or misreported licensee royalties related to non-current periods. We may record a favorable or unfavorable revenue adjustment in connection with the findings from these compliance efforts generally upon resolution with the licensee through agreement of the findings, or upon receipt of the licensee’s correction statement. Revenues from these arrangements are included as a component of licensing revenue. We also undertake activities aimed at identifying potential unauthorized uses of our technologies by third parties with whom we don't have a licensing agreement for such use, which when successful result in the recognition of r evenue. These back royalties stem from third parties who agree to remit payments to us based on past use of our technology. In these scenarios, a legally binding contract did not exist at time of use of our technology, and therefore, we recognize revenue recoveries upon execution of the agreement as that is the point in time to which a contract exists and control is transferred. These revenues are classified as licensing revenue. In general, we classify legal costs associated with activities aimed at identifying potential unauthorized uses of our technologies, auditing existing licensees, and on occasion, pursuing litigation as S&M in our consolidated statements of operations. We recognize licensing revenue gross of withholding taxes, which our licensees remit directly to their local tax authorities, and for which we receive a partial foreign tax credit in our income tax provision. In addition to our licensing arrangements, we also enter into arrangements to deliver products and services. Product Sales. Revenue from the sale of products is recognized when the customer obtains control of the promised good or service, which is generally upon shipment. Services. We provide various services, such as engineering services related to movie soundtrack print mastering, equipment training and maintenance, mixing room alignment, equalization, and image calibration, which we bill on a fixed fee and time and materials basis. Most of these services are of a short duration and are recognized as control of the performance obligations are transferred which is when the related services are performed. Collaborative Arrangements. We collaborate with established cinema exhibitors to offer Dolby Cinema, a branded premium cinema offering for movie audiences. Under such collaborations, Dolby and the exhibitor are both active participants, and share the risks and rewards associated with the business. Accordingly, these collaborations are governed by revenue sharing arrangements under which Dolby receives revenue based on monthly box office reports from exhibitors in exchange for the use of our imaging and sound technologies, our proprietary designs and trademark as well as for the use of our equipment at the exhibitor’s venue. The use of our equipment meets the definition of a lease, and for the related portion of Dolby's share of revenue, we apply ASC 842, Leases , and recognize revenue based on monthly box office reports from exhibitors. Our revenue share is recognized as licensing revenue in our consolidated statements of operations. In addition, we also enter into hybrid agreements where a portion involves guaranteed payments, which in some cases result in classifying the payments as a sales-type lease. In such arrangements, we consider control to transfer at the point in time to which we have installed and tested the equipment, at which point we record such guaranteed payments as product revenue. Via Administration Fee. We generate service fees for managing patent pools on behalf of third party patent owners through our wholly-owned subsidiary, Via Licensing Corporation. As an agent to licensors in the patent pool, Via receives a share of the sales-based royalty that the patent pool licensors earn from licensees. As such, we apply the sales-based royalty exception as the service provided is directly related to the patent pool licensors’ provision of IP, which results in recognition based on estimates of the licensee’s quarter shipments that use the pool’s patents. In addition to sales-based royalties, Via also has contracts where the fees are fixed. The revenue share Via receives from licensors on fixed fee contracts is recognized over the term in which we are providing services associated with the fixed fee contract. We recognize our administrative fees net of the consideration paid to the patent licensors in the pool as licensing revenue. Deferred revenue, which is a component of contract liabilities, represents amounts that are ultimately expected to be recognized as revenue, but for which we have yet to satisfy the performance obligation. On December 27, 2019 , we had $ 41.5 million of remaining performance obligations, 36% of which we expect to recognize as revenue in fiscal 2020, 24% in fiscal 2021, and the balance of 40% in fiscal years beyond 2021. F. Disaggregation of revenue The following table presents a summary of the composition of our revenue for all periods presented: Fiscal Quarter Ended Revenue December 27, 2019 December 28, 2018 Licensing $ 257,683 88 % $ 260,279 86 % Products and services 34,194 12 % 42,097 14 % Total revenue $ 291,877 100 % $ 302,376 100 % The following table presents the composition of our licensing revenue for all periods presented: Fiscal Quarter Ended Market December 27, 2019 December 28, 2018 Broadcast $ 102,133 40 % $ 100,138 38 % Mobile 34,481 13 % 34,173 13 % CE 48,845 19 % 43,750 17 % PC 31,843 12 % 23,157 9 % Other 40,381 16 % 59,061 23 % Total licensing revenue $ 257,683 100 % $ 260,279 100 % We license our technologies in approximately 60 countries, and our licensees distribute products that incorporate our technologies throughout the world. As shown in the table below, we generate the majority of our revenue from outside the United States. Geographic data for our licensing revenue is based on the location of our licensees’ headquarters, products revenue is based on the destination to which we ship our products, and services revenue is based on the location where services are performed. Fiscal Quarter Ended Revenue By Geographic Location December 27, 2019 December 28, 2018 United States $ 107,627 37 % $ 119,799 40 % International 184,250 63 % 182,577 60 % Total revenue $ 291,877 100 % $ 302,376 100 % G. Contract assets and liabilities Our contract assets represent rights to consideration from licensees for the use of our IP that we have estimated in a given quarter in the absence of receiving actual royalty statements from licensees. These estimates reflect our best judgment at that time, and are developed using a number of inputs, including historical experience, anticipated performance, and third-party data . In the event that our estimates differ from actual amounts reported, we record an appropriate adjustment in the quarter in which the report is received which is typically the quarter following our estimate. Actual amounts reported are typically paid within sixty days. The main drivers for change in the contract assets account are variances in quarterly estimates, and to lesser degree, timing of receipt of actual royalty statements. Our contract liabilities consist of advance payments and billings in excess of amounts earned and deferred interest where we have significant financing. The non-current portion of contract liabilities is separately disclosed in our consolidated balance sheets. We present the net contract asset or liability when we have both contract assets and contract liabilities for a single contract. In the first quarter of fiscal 2020, we recognized $6.8 million from prior period deferred revenue and deferred interest from arrangements which include a significant financing component. The following table presents a summary of the balances to which contract assets and liabilities related to revenue are recorded for all periods presented: December 27, 2019 September 27, 2019 Change ($) Change (%) Accounts receivable, net $ 191,001 $ 189,115 $ 1,886 1 % Contract assets 204,963 195,651 9,312 5 % Contract liabilities - current 19,785 19,991 (206 ) (1 )% Contract liabilities - non-current 23,917 24,404 (487 ) (2 )%

Composition Of Certain Financia

Composition Of Certain Financial Statement Captions	3 Months Ended
	Dec. 27, 2019
Composition Of Certain Financial Statement Captions [Abstract]
Composition Of Certain Financial Statement Captions	4 . Composition of Certain Financial Statement Captions The following tables present detailed information from our consolidated balance sheets as of December 27, 2019 and September 27, 2019 (amounts displayed in thousands, except as otherwise noted). Accounts Receivable December 27, September 27, Trade accounts receivable $ 148,625 $ 151,996 Accounts receivable from patent administration program licensees 51,274 46,894 Accounts receivable, gross 199,899 198,890 Less: allowance for doubtful accounts (8,898 ) (9,775 ) Total $ 191,001 $ 189,115 Accounts receivable, gross includes unbilled accounts receivable balances of $84.4 million as of December 27, 2019 related to amounts that are contractually owed. The unbilled balance represents our unconditional right to consideration related to fixed fee contracts which we are entitled to as a result of satisfying, or partially satisfying, performance obligations, as well as Via's unconditional right to consideration related to their patent administration programs. Inventories December 27, September 27, Raw materials $ 6,933 $ 8,031 Work in process 4,432 4,872 Finished goods 17,739 19,428 Total $ 29,104 $ 32,331 Inventories are stated at the lower of cost and net realizable value. Inventory with a consumption period expected to exceed twelve months is recorded within other non-current assets in our consolidated balance sheets. We have included $3.3 million and $3.0 million of raw materials inventory within other non-current assets in our consolidated balance sheets as of December 27, 2019 and September 27, 2019 , respectively. Based on anticipated inventory consumption rates, and aside from existing write-downs due to excess inventory, we do not believe that material risk of obsolescence exists prior to ultimate sale. Prepaid Expenses And Other Current Assets December 27, September 27, Prepaid expenses $ 28,774 $ 17,997 Other current assets 23,105 20,924 Income tax receivable 672 783 Total $ 52,551 $ 39,704 As of December 27, 2019, other current assets include the carrying value of $2.2 million of land and building that are currently held for sale. Management has committed to a plan to sell the property. Based on current estimated selling prices in the market, we have determined that no indicators of potential impairment exist. Accrued Liabilities December 27, September 27, Accrued royalties $ 3,107 $ 2,957 Amounts payable to patent administration program partners 58,015 58,899 Accrued compensation and benefits 60,698 78,716 Accrued professional fees 16,165 19,216 Unpaid PP&E additions 14,350 15,332 Accrued customer refunds 18,222 24,299 Other accrued liabilities 71,495 68,725 Total $ 242,052 $ 268,144 Other Non-Current Liabilities December 27, September 27, Supplemental retirement plan obligations $ 3,649 $ 3,466 Non-current tax liabilities (1) 138,305 136,323 Other liabilities 37,268 37,673 Total $ 179,222 $ 177,462 (1) Refer to Note 12 “ Income Taxes ” for additional information related to tax liabilities.

Investments & Fair Value Measur

Investments & Fair Value Measurements	3 Months Ended
	Dec. 27, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Investments & Fair Value Measurements	. Investments & Fair Value Measurements We use cash holdings to purchase investment grade securities diversified among security types, industries, and issuers. All of our investment securities are measured at fair value, and are recorded within cash equivalents and both short-term and long-term investments in our consolidated balance sheets. With the exception of our mutual fund investments held in our SERP and classified as trading securities, all of our investments are classified as AFS securities. Derivative contracts are used to hedge currency risk, these are carried at fair value and classified as other assets and other liabilities. Our investment securities primarily consist of government bonds, certificates of deposit, municipal debt securities, corporate bonds, U.S. agency securities, and commercial paper. In addition, our cash and cash equivalents also consist of highly-liquid money market funds. Consistent with our investment policy, none of our municipal debt investments are supported by letters of credit or standby purchase agreements. Our cash and investment portfolio consisted of the following (in thousands): December 27, 2019 Cost Unrealized Estimated Fair Value Gains Losses Total Level 1 Level 2 Level 3 Cash and cash equivalents: Cash $ 719,126 $ — $ — $ 719,126 $ 719,126 $ — $ — Cash equivalents: Money market funds 22,303 — — 22,303 22,303 — — Cash and cash equivalents 741,429 — — 741,429 741,429 — — Short-term investments: Certificate of deposit 4,730 — (2 ) 4,728 — 4,728 — U.S. agency securities 6,396 4 (1 ) 6,399 — 6,399 — Government bonds 44,911 15 — 44,926 41,658 3,268 — Commercial paper 15,884 4 (8 ) 15,880 — 15,880 — Corporate bonds 83,679 153 (22 ) 83,810 — 83,810 — Municipal debt securities 14,470 22 (1 ) 14,491 — 14,491 — Short-term investments 170,070 198 (34 ) 170,234 41,658 128,576 — Long-term investments: U.S. agency securities 8,704 132 (1 ) 8,835 — 8,835 — Government bonds 26,219 78 (20 ) 26,277 22,865 3,412 — Corporate bonds 91,812 759 (88 ) 92,483 — 92,483 — Municipal debt securities 12,532 99 (1 ) 12,630 — 12,630 — Other long-term investments (1) 1,495 — — 1,495 — — — Long-term investments 140,762 1,068 (110 ) 141,720 22,865 117,360 — Total cash, cash equivalents, and investments $ 1,052,261 $ 1,266 $ (144 ) $ 1,053,383 $ 805,952 $ 245,936 $ — Investments held in supplemental retirement plan: Assets 3,746 — — 3,746 3,746 — — Included in prepaid expenses and other current assets & other non-current assets Liabilities 3,746 — — 3,746 3,746 — — Included in accrued liabilities & other non-current liabilities Currency derivatives as hedge instruments: Assets — 426 — 426 — 426 — Included in other current assets Liabilities — — (62 ) (62 ) — (62 ) — Included in other accrued expenses (1) Other long-term investments as of December 27, 2019 include investments that are not carried at fair value including an equity method investment of $1.5 million . September 27, 2019 Cost Unrealized Estimated Fair Value Gains Losses Total Level 1 Level 2 Level 3 Cash and cash equivalents: Cash $ 680,287 $ — $ — $ 680,287 $ 680,287 $ — $ — Cash equivalents: Corporate bonds 1,000 — — 1,000 — 1,000 — Money market funds 115,270 — — 115,270 115,270 — — Government bonds 653 — — 653 653 — — Cash and cash equivalents 797,210 — — 797,210 796,210 1,000 — Short-term investments: Certificate of deposit 1,265 1 — 1,266 — 1,266 — U.S. agency securities 10,973 8 (9 ) 10,972 — 10,972 — Government bonds 8,381 11 (1 ) 8,391 5,784 2,607 — Commercial paper 6,347 9 — 6,356 — 6,356 — Corporate bonds 76,802 172 (34 ) 76,940 — 76,940 — Municipal debt securities 15,210 18 (7 ) 15,221 — 15,221 — Short-term investments 118,978 219 (51 ) 119,146 5,784 113,362 — Long-term investments: Asset backed securities 400 2 — 402 — 402 — U.S. agency securities 7,102 146 — 7,248 — 7,248 — Government bonds 23,563 187 — 23,750 19,670 4,080 — Corporate bonds 134,360 1,700 — 136,060 — 136,060 — Municipal debt securities 10,315 87 (6 ) 10,396 — 10,396 — Other long-term investments (1) 1,731 — — 1,731 — — — Long-term investments 177,471 2,122 (6 ) 179,587 19,670 158,186 — Total cash, cash equivalents, and investments $ 1,093,659 $ 2,341 $ (57 ) $ 1,095,943 $ 821,664 $ 272,548 $ — Investments held in supplemental retirement plan: Assets 3,564 — — 3,564 3,564 — — Included in prepaid expenses and other current assets & other non-current assets Liabilities 3,564 — — 3,564 3,564 — — Included in accrued liabilities & other non-current liabilities Currency derivatives as hedge instruments: Assets — — — — — — — Included in other current assets Liabilities — — (242 ) (242 ) — (242 ) — Included in other accrued expenses (1) Other long-term investments as of September 27, 2019 include an investment that is not carried at fair value including an equity method investment of $1.7 million . Fair Value Hierarchy. Fair value is the exchange price that would be received for an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability, in an orderly transaction between market participants at the measurement date. We minimize the use of unobservable inputs and use observable market data, if available, when determining fair value. We classify our inputs to measure fair value using the following three-level hierarchy: Level 1: Quoted prices in active markets at the measurement date for identical assets and liabilities. We base the fair value of our Level 1 financial instruments, which are traded in active markets, using quoted market prices for identical instruments. Level 2: Prices may be based upon quoted prices in active markets or inputs not quoted on active markets but are corroborated by market data. We obtain the fair value of our Level 2 investments from a professional pricing service, which may use quoted market prices for identical or comparable instruments, or model driven valuations using observable market data or inputs corroborated by observable market data. To validate the fair value determination provided by our primary pricing service, we perform quality controls over values received which include comparing our pricing service provider’s assessment of the fair values of our investment securities against the fair values of our investment securities obtained from another independent source, reviewing the pricing movement in the context of overall market trends, and reviewing trading information from our investment managers. In addition, we assess the inputs and methods used in determining the fair value in order to determine the classification of securities in the fair value hierarchy. The fair value of the currency derivatives are calculated from market spot rates, forward rates, interest rates, and credit ratings at the end of the period. Level 3: Unobservable inputs are used when little or no market data is available and reflect management’s estimates of assumptions that market participants would use in pricing the asset or liability. Securities In Gross Unrealized Loss Position. We periodically evaluate our investments for other-than- temporary declines in fair value. The unrealized losses on our AFS securities were primarily the result of unfavorable changes in interest rates subsequent to the initial purchase of these securities. The following table presents the gross unrealized losses and fair value for those AFS securities that were in an unrealized loss position for less than twelve months and for twelve months or greater as of December 27, 2019 and September 27, 2019 (in thousands): December 27, 2019 September 27, 2019 Less Than 12 Months 12 Months Or Greater Less Than 12 Months 12 Months Or Greater Investment Type Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Certificate of deposit $ 4,298 $ (2 ) $ — $ — $ 300 $ — $ — $ — U.S. agency securities 333 — 4,797 (1 ) — — 4,787 (9 ) Government bonds 38,385 (21 ) — — 1,426 — — — Commercial paper 11,787 (9 ) — — — — — — Corporate bonds 36,756 (100 ) 11,374 (10 ) 7,647 (3 ) 27,078 (32 ) Municipal debt securities 3,968 (2 ) — — 9,552 (13 ) 900 — Total $ 95,527 $ (134 ) $ 16,171 $ (11 ) $ 18,925 $ (16 ) $ 32,765 $ (41 ) Although we had certain securities that were in an unrealized loss position as of December 27, 2019 , we expect to recover the full carrying value of these securities. As a result, we do not consider any portion of the unrealized losses at either December 27, 2019 or September 27, 2019 to represent an other–than–temporary impairment, nor do we consider any of the unrealized losses to be credit losses. Investment Maturities. The following table summarizes the amortized cost and estimated fair value of the AFS securities within our investment portfolio based on stated maturities as of December 27, 2019 and September 27, 2019 , which are recorded within cash equivalents and both short and long-term investments in our consolidated balance sheets (in thousands): December 27, 2019 September 27, 2019 Range of maturity Amortized Cost Fair Value Amortized Cost Fair Value Due within 1 year $ 192,373 $ 192,537 $ 238,186 $ 238,354 Due in 1 to 2 years 57,931 58,481 93,948 94,899 Due in 2 to 3 years 81,337 81,744 81,793 82,957 Total $ 331,641 $ 332,762 $ 413,927 $ 416,210

Property, Plant and Equipment

Property, Plant and Equipment	3 Months Ended
	Dec. 27, 2019
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	. Property, Plant, & Equipment Property, plant, and equipment are recorded at cost, with depreciation expense included in cost of licensing, cost of products and services, R&D, S&M, and G&A expenses in our consolidated statements of operations. PP&E consist of the following (in thousands): December 27, September 27, Land $ 41,980 $ 41,918 Buildings and building improvements 283,462 282,924 Leasehold improvements 67,253 66,730 Machinery and equipment 127,183 128,525 Computer equipment and software 219,773 219,455 Furniture and fixtures 31,571 34,191 Equipment provided under operating leases 174,155 161,372 Construction-in-progress 32,251 19,616 Property, plant, and equipment, gross 977,628 954,731 Less: accumulated depreciation (428,133 ) (417,299 ) Property, plant, & equipment, net $ 549,495 $ 537,432

Leases (Notes)

Leases (Notes)	3 Months Ended
	Dec. 27, 2019
Leases [Abstract]
Leases	Leases As Lessee As a lessee, we enter into contracts to access and utilize office space, including those payable to our principal stockholder and portions attributable to the controlling interests in our wholly owned subsidiaries. We determine if a contract contains a lease based on whether we have the right to obtain substantially all of the economic benefits from the use of an identified asset and whether we have the right to direct the use of an identified asset in exchange for consideration, which relates to an asset which we do not own. Right of use (“ROU”) assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. ROU assets are recognized as the lease liability, adjusted for lease incentives received. Lease liabilities are recognized at the present value of the future lease payments at the lease commencement date. The interest rate used to determine the present value of the future lease payments is our Incremental Borrowing Rate ("IBR"), because the interest rate implicit in most of our leases is not readily determinable. The IBR is a hypothetical rate based on our understanding of what our credit rating would be to borrow and resulting interest we would pay to borrow an amount equal to the lease payments in a similar economic environment over the lease term on a collateralized basis. Lease payments may be fixed or variable, however, only fixed payments are included in our lease liability calculation. Variable lease payments are recognized in operating expenses in the period in which the obligation for those payments are incurred. The lease term of operating leases vary from less than a year to 11 years . We have leases that include one or more options to extend the lease term for up to 8 years as well as options to terminate the lease within one year . Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise such options. The components of lease expense were as follows (in thousands): Fiscal Quarter Ended December 27, 2019 Lease cost Operating lease cost 5,356 Variable lease cost 394 Total lease cost 5,750 Supplemental cash flow information related to leases was as follows (in thousands): Fiscal Quarter Ended December 27, 2019 Other information Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases 5,241 Right-of-use assets obtained in exchange for lease obligations: Operating lease liabilities 12,816 Supplemental balance sheet information related to leases was as follows: December 27, 2019 Weighted-average remaining lease term Operating leases 7.3 years Weighted-average discount rate Operating leases 3.4 % The following table presents the maturity analysis of lease liabilities (in thousands): December 27, 2019 September 27, 2019 Operating Leases Operating Leases Remainder of Fiscal 2020 15,386 17,231 Fiscal 2021 13,643 9,329 Fiscal 2022 11,336 7,191 Fiscal 2023 9,375 6,218 Fiscal 2024 6,703 4,499 Thereafter 29,320 12,355 Total undiscounted lease payments 85,763 56,823 Less: imputed interest (12,174 ) Total lease liabilities 73,589 As Lessor As a lessor, we lease our Dolby Cinema product solution to exhibitors, Dolby Voice equipment to cloud conferencing service providers, and a real estate property. The terms of these leases vary from 4 to 10 years . Lease components consist of fixed payments and/or variable lease payments based on contracted percentages of revenue. Generally, leases do not grant any right to the lessee to purchase the underlying asset at the end of the lease term, with the exception of certain leases of Dolby Voice equipment for which the customer has the option to purchase the equipment at fair value. Dolby Cinema lease arrangements have options to extend the lease term at expiration by increments ranging from 1 to 5 years . Assets provided under an operating lease are carried at cost within property, plant and equipment and depreciated over the lease term using the straight-line method. Fixed operating lease payments are recognized on a straight-line basis over the lease term to other income for our real estate property and to revenue for all other leases. Variable lease payments received under our Dolby Cinema operating leases are computed as shares of lessees' box office revenues and recognized to revenue in the period that box office sales occur. Lease incentive payments we make to lessees are amortized as a reduction in revenue over the lease term. For the quarter ended December 27, 2019 , variable operating lease income was $7.3 million and fixed operating lease income was $0.7 million . If a lease is classified as a sales-type lease, the carrying amount of the asset is derecognized from property, plant and equipment and a net investment in the lease is recorded. The net investment in the lease is measured at commencement date as the sum of the lease receivable and the estimated residual value of the equipment. The unguaranteed residual value of the equipment was determined as the estimated carrying value of the asset at the end of the lease term had the asset been depreciated on a straight-line basis. At December 27, 2019 , the unguaranteed residual value of sales-type leases was $0.7 million . Selling profit or loss arising from a sales-type lease is recorded at lease commencement and presented on a gross basis. Over the term of the lease, we recognize interest income on the net investment in the lease and any variable lease payments, which is not material and not included in the net investment in the lease. The following table presents the maturity analysis of lease payments due to Dolby (in thousands): December 27, 2019 Operating Leases Sales-Type Leases Remainder of Fiscal 2020 1,669 4,059 Fiscal 2021 2,227 1,595 Fiscal 2022 2,227 1,595 Fiscal 2023 2,153 1,595 Fiscal 2024 1,107 795 Thereafter — 790 Total undiscounted cash flows 9,383 10,429 Less: present value of lease payments (recognized as lease receivables) (8,095 ) Difference 2,334
Leases	Leases As Lessee As a lessee, we enter into contracts to access and utilize office space, including those payable to our principal stockholder and portions attributable to the controlling interests in our wholly owned subsidiaries. We determine if a contract contains a lease based on whether we have the right to obtain substantially all of the economic benefits from the use of an identified asset and whether we have the right to direct the use of an identified asset in exchange for consideration, which relates to an asset which we do not own. Right of use (“ROU”) assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. ROU assets are recognized as the lease liability, adjusted for lease incentives received. Lease liabilities are recognized at the present value of the future lease payments at the lease commencement date. The interest rate used to determine the present value of the future lease payments is our Incremental Borrowing Rate ("IBR"), because the interest rate implicit in most of our leases is not readily determinable. The IBR is a hypothetical rate based on our understanding of what our credit rating would be to borrow and resulting interest we would pay to borrow an amount equal to the lease payments in a similar economic environment over the lease term on a collateralized basis. Lease payments may be fixed or variable, however, only fixed payments are included in our lease liability calculation. Variable lease payments are recognized in operating expenses in the period in which the obligation for those payments are incurred. The lease term of operating leases vary from less than a year to 11 years . We have leases that include one or more options to extend the lease term for up to 8 years as well as options to terminate the lease within one year . Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise such options. The components of lease expense were as follows (in thousands): Fiscal Quarter Ended December 27, 2019 Lease cost Operating lease cost 5,356 Variable lease cost 394 Total lease cost 5,750 Supplemental cash flow information related to leases was as follows (in thousands): Fiscal Quarter Ended December 27, 2019 Other information Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases 5,241 Right-of-use assets obtained in exchange for lease obligations: Operating lease liabilities 12,816 Supplemental balance sheet information related to leases was as follows: December 27, 2019 Weighted-average remaining lease term Operating leases 7.3 years Weighted-average discount rate Operating leases 3.4 % The following table presents the maturity analysis of lease liabilities (in thousands): December 27, 2019 September 27, 2019 Operating Leases Operating Leases Remainder of Fiscal 2020 15,386 17,231 Fiscal 2021 13,643 9,329 Fiscal 2022 11,336 7,191 Fiscal 2023 9,375 6,218 Fiscal 2024 6,703 4,499 Thereafter 29,320 12,355 Total undiscounted lease payments 85,763 56,823 Less: imputed interest (12,174 ) Total lease liabilities 73,589 As Lessor As a lessor, we lease our Dolby Cinema product solution to exhibitors, Dolby Voice equipment to cloud conferencing service providers, and a real estate property. The terms of these leases vary from 4 to 10 years . Lease components consist of fixed payments and/or variable lease payments based on contracted percentages of revenue. Generally, leases do not grant any right to the lessee to purchase the underlying asset at the end of the lease term, with the exception of certain leases of Dolby Voice equipment for which the customer has the option to purchase the equipment at fair value. Dolby Cinema lease arrangements have options to extend the lease term at expiration by increments ranging from 1 to 5 years . Assets provided under an operating lease are carried at cost within property, plant and equipment and depreciated over the lease term using the straight-line method. Fixed operating lease payments are recognized on a straight-line basis over the lease term to other income for our real estate property and to revenue for all other leases. Variable lease payments received under our Dolby Cinema operating leases are computed as shares of lessees' box office revenues and recognized to revenue in the period that box office sales occur. Lease incentive payments we make to lessees are amortized as a reduction in revenue over the lease term. For the quarter ended December 27, 2019 , variable operating lease income was $7.3 million and fixed operating lease income was $0.7 million . If a lease is classified as a sales-type lease, the carrying amount of the asset is derecognized from property, plant and equipment and a net investment in the lease is recorded. The net investment in the lease is measured at commencement date as the sum of the lease receivable and the estimated residual value of the equipment. The unguaranteed residual value of the equipment was determined as the estimated carrying value of the asset at the end of the lease term had the asset been depreciated on a straight-line basis. At December 27, 2019 , the unguaranteed residual value of sales-type leases was $0.7 million . Selling profit or loss arising from a sales-type lease is recorded at lease commencement and presented on a gross basis. Over the term of the lease, we recognize interest income on the net investment in the lease and any variable lease payments, which is not material and not included in the net investment in the lease. The following table presents the maturity analysis of lease payments due to Dolby (in thousands): December 27, 2019 Operating Leases Sales-Type Leases Remainder of Fiscal 2020 1,669 4,059 Fiscal 2021 2,227 1,595 Fiscal 2022 2,227 1,595 Fiscal 2023 2,153 1,595 Fiscal 2024 1,107 795 Thereafter — 790 Total undiscounted cash flows 9,383 10,429 Less: present value of lease payments (recognized as lease receivables) (8,095 ) Difference 2,334
Leases	Leases As Lessee As a lessee, we enter into contracts to access and utilize office space, including those payable to our principal stockholder and portions attributable to the controlling interests in our wholly owned subsidiaries. We determine if a contract contains a lease based on whether we have the right to obtain substantially all of the economic benefits from the use of an identified asset and whether we have the right to direct the use of an identified asset in exchange for consideration, which relates to an asset which we do not own. Right of use (“ROU”) assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. ROU assets are recognized as the lease liability, adjusted for lease incentives received. Lease liabilities are recognized at the present value of the future lease payments at the lease commencement date. The interest rate used to determine the present value of the future lease payments is our Incremental Borrowing Rate ("IBR"), because the interest rate implicit in most of our leases is not readily determinable. The IBR is a hypothetical rate based on our understanding of what our credit rating would be to borrow and resulting interest we would pay to borrow an amount equal to the lease payments in a similar economic environment over the lease term on a collateralized basis. Lease payments may be fixed or variable, however, only fixed payments are included in our lease liability calculation. Variable lease payments are recognized in operating expenses in the period in which the obligation for those payments are incurred. The lease term of operating leases vary from less than a year to 11 years . We have leases that include one or more options to extend the lease term for up to 8 years as well as options to terminate the lease within one year . Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise such options. The components of lease expense were as follows (in thousands): Fiscal Quarter Ended December 27, 2019 Lease cost Operating lease cost 5,356 Variable lease cost 394 Total lease cost 5,750 Supplemental cash flow information related to leases was as follows (in thousands): Fiscal Quarter Ended December 27, 2019 Other information Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases 5,241 Right-of-use assets obtained in exchange for lease obligations: Operating lease liabilities 12,816 Supplemental balance sheet information related to leases was as follows: December 27, 2019 Weighted-average remaining lease term Operating leases 7.3 years Weighted-average discount rate Operating leases 3.4 % The following table presents the maturity analysis of lease liabilities (in thousands): December 27, 2019 September 27, 2019 Operating Leases Operating Leases Remainder of Fiscal 2020 15,386 17,231 Fiscal 2021 13,643 9,329 Fiscal 2022 11,336 7,191 Fiscal 2023 9,375 6,218 Fiscal 2024 6,703 4,499 Thereafter 29,320 12,355 Total undiscounted lease payments 85,763 56,823 Less: imputed interest (12,174 ) Total lease liabilities 73,589 As Lessor As a lessor, we lease our Dolby Cinema product solution to exhibitors, Dolby Voice equipment to cloud conferencing service providers, and a real estate property. The terms of these leases vary from 4 to 10 years . Lease components consist of fixed payments and/or variable lease payments based on contracted percentages of revenue. Generally, leases do not grant any right to the lessee to purchase the underlying asset at the end of the lease term, with the exception of certain leases of Dolby Voice equipment for which the customer has the option to purchase the equipment at fair value. Dolby Cinema lease arrangements have options to extend the lease term at expiration by increments ranging from 1 to 5 years . Assets provided under an operating lease are carried at cost within property, plant and equipment and depreciated over the lease term using the straight-line method. Fixed operating lease payments are recognized on a straight-line basis over the lease term to other income for our real estate property and to revenue for all other leases. Variable lease payments received under our Dolby Cinema operating leases are computed as shares of lessees' box office revenues and recognized to revenue in the period that box office sales occur. Lease incentive payments we make to lessees are amortized as a reduction in revenue over the lease term. For the quarter ended December 27, 2019 , variable operating lease income was $7.3 million and fixed operating lease income was $0.7 million . If a lease is classified as a sales-type lease, the carrying amount of the asset is derecognized from property, plant and equipment and a net investment in the lease is recorded. The net investment in the lease is measured at commencement date as the sum of the lease receivable and the estimated residual value of the equipment. The unguaranteed residual value of the equipment was determined as the estimated carrying value of the asset at the end of the lease term had the asset been depreciated on a straight-line basis. At December 27, 2019 , the unguaranteed residual value of sales-type leases was $0.7 million . Selling profit or loss arising from a sales-type lease is recorded at lease commencement and presented on a gross basis. Over the term of the lease, we recognize interest income on the net investment in the lease and any variable lease payments, which is not material and not included in the net investment in the lease. The following table presents the maturity analysis of lease payments due to Dolby (in thousands): December 27, 2019 Operating Leases Sales-Type Leases Remainder of Fiscal 2020 1,669 4,059 Fiscal 2021 2,227 1,595 Fiscal 2022 2,227 1,595 Fiscal 2023 2,153 1,595 Fiscal 2024 1,107 795 Thereafter — 790 Total undiscounted cash flows 9,383 10,429 Less: present value of lease payments (recognized as lease receivables) (8,095 ) Difference 2,334

Goodwill and Intangible Assets

Goodwill and Intangible Assets	3 Months Ended
	Dec. 27, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	. Goodwill & Intangible Assets Goodwill The following table outlines changes to the carrying amount of goodwill (in thousands): Goodwill Balance at September 27, 2019 $ 334,829 Acquired goodwill — Translation adjustments 614 Balance at December 27, 2019 $ 335,443 Intangible Assets Our intangible assets are stated at their original cost less accumulated amortization, and principally consist of acquired technology, patents, trademarks, customer relationships and contracts. Intangible assets subject to amortization consist of the following (in thousands): December 27, 2019 September 27, 2019 Intangible Assets Cost Accumulated Amortization Net Cost Accumulated Amortization Net Acquired patents and technology $ 340,519 $ (183,283 ) $ 157,236 $ 338,075 $ (176,867 ) $ 161,208 Customer relationships 64,718 (46,417 ) 18,301 64,728 (45,510 ) 19,218 Other intangibles 22,942 (22,498 ) 444 22,902 (22,437 ) 465 Total $ 428,179 $ (252,198 ) $ 175,981 $ 425,705 $ (244,814 ) $ 180,891 We purchase various patents and developed technologies that enable us to further develop our audio, imaging, and potential product offerings. With regard to our purchase of intangible assets during the periods presented, the following table summarizes the consideration paid, the weighted-average useful lives over which the acquired assets will be amortized using the greater of either the straight-line basis or a ratio-to-revenue method, and the classification of their amortized expense in our consolidated statements of operations: Fiscal Period Total Purchase Consideration (1) Weighted-Average Useful Life (in millions) (in years) Fiscal 2019 Q1 - Quarter ended December 28, 2018 $12.1 11.6 Fiscal 2020 Q1 - Quarter ended December 27, 2019 $2.9 14.0 (1) Amortization expense on the intangible assets from patent portfolio and business acquisitions is included within cost of revenue, R&D, and G&A in our consolidated statements of operations. Amortization expense for our intangible assets is included in cost of licensing, cost of products, R&D, S&M, and G&A expenses in our consolidated statements of operations. Amortization expense was $7.2 million and $6.6 million in the first quarter of fiscal 2020 and 2019 , respectively. As of December 27, 2019 , estimated amortization expense in future fiscal periods was as follows (in thousands): Fiscal Year Amortization Expense (in thousands) Remainder of 2020 $ 22,346 2021 29,585 2022 27,580 2023 23,898 2024 22,273 Thereafter 50,299 Total $ 175,981

Stockholders' Equity And Stock-

Stockholders' Equity And Stock-Based Compensation	3 Months Ended
	Dec. 27, 2019
Stockholders' Equity And Stock-Based Compensation [Abstract]
Stockholders' Equity And Stock-Based Compensation	. Stockholders' Equity & Stock-Based Compensation We provide stock-based awards as a form of compensation for employees, officers, and directors. We have issued stock-based awards in the form of stock options and restricted stock units ("RSUs") under our equity incentive plans, as well as shares under our ESPP. Common Stock - Class A and Class B Our Board of Directors has authorized two classes of common stock, Class A and Class B. At December 27, 2019 , we had authorized 500,000,000 Class A shares and 500,000,000 Class B shares. At December 27, 2019 , we had 64,649,011 shares of Class A common stock and 36,229,820 shares of Class B common stock issued and outstanding. Holders of our Class A and Class B common stock have identical rights, except that holders of our Class A common stock are entitled to one vote per share and holders of our Class B common stock are entitled to ten votes per share. Shares of Class B common stock can be converted to shares of Class A common stock at any time at the option of the stockholder and automatically convert upon sale or transfer, except for certain transfers specified in our amended and restated certificate of incorporation. Stock Incentive Plans 2005 Stock Plan. In January 2005, our stockholders approved our 2005 Stock Plan, which our Board of Directors adopted in November 2004. The 2005 Stock Plan became effective on February 16, 2005, the day prior to the completion of our initial public offering. Our 2005 Stock Plan, as amended and restated, provides for the ability to grant incentive stock options, non-qualified stock options, restricted stock, RSUs, stock appreciation rights, deferred stock units, performance units, performance bonus awards, and performance shares. A total of 46.0 million shares of our Class A common stock is authorized for issuance under the 2005 Stock Plan. For awards granted prior to February 2011, any shares subject to an award with a per share price less than the fair market value of our Class A common stock on the date of grant and any shares subject to an outstanding RSU award will be counted against the authorized share reserve as two shares for every one share subject to the award, and if returned to the 2005 Stock Plan, such shares will be counted as two shares for every one share returned. For those awards granted from February 2011 onward, any shares subject to an award with a per share price less than the fair market value of our Class A common stock on the date of grant and any shares subject to an outstanding RSU award will be counted against the authorized share reserve as 1.6 shares for every one share subject to the award, and if returned to the 2005 Stock Plan, such shares will be counted as 1.6 shares for every one share returned. Stock Options. Stock options are granted at fair market value on the date of grant. Options granted to employees and officers prior to June 2008 generally vested over four years , with equal annual cliff-vesting and expire on the earlier of ten years after the date of grant or three months after termination of service. Options granted to employees and officers from June 2008 onward generally vest over four years, with 25% of the shares subject to the option becoming exercisable on the one-year anniversary of the date of grant and the balance of the shares vesting in equal monthly installments over the following 36 months . These options expire on the earlier of ten years after the date of grant or three months after termination of service. All options granted vest over the requisite service period and upon the exercise of stock options, we issue new shares of Class A common stock under the 2005 Stock Plan. Our 2005 Stock Plan also allows us to grant stock awards which vest based on the satisfaction of specific performance criteria. Performance-Based Stock Options (PSOs). In fiscal 2016, we began granting PSOs to our executive officers with shares of our Class A common stock underlying such options. The contractual term for the PSOs is seven years , with vesting contingent upon market-based performance conditions, representing the achievement of specified Dolby annualized TSR targets at the end of a three -year measurement period following the date of grant. If the minimum conditions are met, the PSOs earned will cliff vest on the third anniversary of the grant date, upon certification of achievement of the performance conditions by our Compensation Committee. Anywhere from 0% to 125% of the shares subject to a PSO may vest based on achievement of the performance conditions at the end of the three-year performance period. In valuing the PSOs which will be recognized as compensation cost, we used a Monte Carlo valuation model. Aside from the use of an expected term for the PSOs commensurate with their shorter contractual term, the nature of the valuation inputs used in the Monte Carlo valuation model were consistent with those used to value our non-performance based options granted under the 2005 Stock Plan. Compensation cost is being amortized on a straight-line basis over the requisite service period. On December 15, 2018, we granted PSOs to our executive officers exercisable for an aggregate of 241,100 shares at the target award amount, which would be exercisable up to an aggregate of 301,375 shares at 125% of the target award amount. On December 15, 2017, we granted PSOs to our executive officers exercisable for an aggregate of 264,000 shares at the target award amount, which would be exercisable up to an aggregate of 330,000 shares at 125% of the target award amount. On December 15, 2016, we granted PSOs to our executive officers exercisable for an aggregate of 276,199 shares at the target award amount, which vested in December 2019 at 95% of the target award amount, for an aggregate of 240,539 . On December 15, 2015, we granted PSOs to our executive officers, which vested in December 2018 at 125% of the target award amount, for an aggregate of 334,623 shares. As of December 27, 2019 , PSOs which would be exercisable for an aggregate of 745,639 shares at the target award amount ( 1,169,120 at 125% of the target award amount) were outstanding. Performance-Based Restricted Stock Units (PSUs). In the first quarter of fiscal 2020, we began granting PSUs to our executive officers with shares of our Class A common stock underlying such awards. The terms of the PSU Agreement adopted in the first quarter fiscal 2020 provide for the grant of performance-based restricted stock units to our executive officers contingent on Dolby's achievement of annualized TSR targets measured against a comparator index over a three-year performance period following the date of grant. Anywhere from 0% to 200% of eligible restricted stock units may vest based on achievement of the performance conditions at the end of the three-year performance period. As of December 27, 2019 , PSUs which would vest for an aggregate of 62,000 shares at the target amount ( 124,000 at 200% of the target award amount) were outstanding. In valuing the PSUs which will be recognized as compensation cost, we used a Monte Carlo valuation model. Compensation cost is being amortized on a straight-line basis over the requisite service period. The following table summarizes information about all stock options issued under our 2005 Stock Plan: Shares Weighted-Average Exercise Price Weighted-Average Remaining Contractual Life Aggregate Intrinsic Value (1) (in thousands) (in years) (in thousands) Options outstanding at September 27, 2019 7,201 $ 48.03 Grants 1,058 68.41 Exercises (441 ) 38.92 Forfeitures and cancellations (23 ) 60.18 Options outstanding at December 27, 2019 7,795 51.28 6.60 $ 132,844 Options vested and expected to vest at December 27, 2019 7,369 50.45 6.48 131,897 Options exercisable at December 27, 2019 4,633 $ 43.13 5.43 116,784 (1) Aggregate intrinsic value is based on the closing price of our Class A common stock on December 27, 2019 of $68.34 and excludes the impact of options that were not in-the-money. Restricted Stock Units. Beginning in fiscal 2008, we began granting RSUs to certain directors, officers, and employees under our 2005 Stock Plan. Awards granted to employees and officers generally vest over four years, with equal annual cliff-vesting. Awards granted to directors prior to November 2010 generally vested over three years, with equal annual cliff-vesting. Awards granted after November 2010 and prior to fiscal 2014 to new directors vested over approximately two years, with 50% vesting per year, while awards granted from November 2010 onward to ongoing directors generally vest over approximately one year. Awards granted to new directors from fiscal 2014 onward vest on the earlier of the first anniversary of the award’s date of grant, or the day immediately preceding the date of the next annual meeting of stockholders that occurs after the award’s date of grant. Our 2005 Stock Plan also allows us to grant RSUs that vest based on the satisfaction of specific performance criteria, although no such awards had been granted as of December 27, 2019 . At each vesting date, the holder of the award is issued shares of our Class A common stock. Compensation expense from these awards is equal to the fair market value of our Class A common stock on the date of grant and is recognized on a straight-line basis over the requisite service period. The following table summarizes information about RSUs issued under our 2005 Stock Plan: Shares Weighted-Average Grant Date Fair Value (in thousands) Non-vested at September 27, 2019 2,805 $ 58.84 Granted 1,214 66.28 Vested (897 ) 51.77 Forfeitures (43 ) 59.23 Non-vested at December 27, 2019 3,079 $ 62.39 Employee Stock Purchase Plan . Our plan allows eligible employees to have up to 10 percent of their eligible compensation withheld and used to purchase Class A common stock, subject to a maximum of $25,000 worth of stock purchased in a calendar year or no more than 1,000 shares in an offering period, whichever is less. An offering period consists of successive six -month purchase periods, with a look back feature to our stock price at the commencement of a one -year offering period. The plan provides for a discount equal to 15 percent of the lower of the closing price of our Class A common stock on the New York Stock Exchange on the first and last day of the offering periods. The plan also includes an automatic reset feature that provides for an offering period to be reset and recommenced to a new lower-priced offering if the offering price of a new offering period is less than that of the immediately preceding offering period. Stock Option Valuation Assumptions We use the Black-Scholes option pricing model to determine the estimated fair value of employee stock options at the date of the grant. The Black-Scholes model includes inputs that require us to make certain estimates and assumptions regarding the expected term of the award, as well as the future risk-free interest rate, and the volatility of our stock price over the expected term of the award. Expected Term. The expected term of an award represents the estimated period of time that options granted will remain outstanding, and is measured from the grant date to the date at which the option is either exercised or canceled. Our determination of the expected term involves an evaluation of historical terms and other factors such as the exercise and termination patterns of our employees who hold options to acquire our Class A common stock, and is based on certain assumptions made regarding the future exercise and termination behavior. Risk-Free Interest Rate. The risk-free interest rate is based on the yield curve of United States Treasury instruments in effect on the date of grant. In determining an estimate for the risk-free interest rate, we use average interest rates based on these instruments’ constant maturities with a term that approximates and corresponds with the expected term of our awards. Expected Stock Price Volatility. The expected volatility represents the estimated volatility in the price of our Class A common stock over a time period that approximates the expected term of the awards, and is determined using a blended combination of historical and implied volatility. Historical volatility is representative of the historical trends in our stock price for periods preceding the measurement date for a period that is commensurate with the expected term. Implied volatility is based upon externally traded option contracts of our Class A common stock. Dividend Yield. The dividend yield is based on our anticipated dividend payout over the expected term of our option awards. Dividend declarations and the establishment of future record and payment dates are subject to the Board of Directors’ continuing determination that the dividend policy is in the best interests of our stockholders. The dividend policy may be changed or canceled at the discretion of the Board of Directors at any time. The weighted-average assumptions used in the determination of the fair value of our stock options were as follows: Fiscal Quarter Ended December 27, December 28, Expected life (in years) 4.91 4.90 Risk-free interest rate 1.7 % 2.7 % Expected stock price volatility 23.9 % 22.9 % Dividend yield 1.3 % 1.1 % Stock-Based Compensation Expense Stock-based compensation expense for equity awards granted to employees is determined by estimating their fair value on the date of grant, and recognizing that value as an expense on a straight-line basis over the requisite service period in which our employees earn the awards. Compensation expense related to these equity awards is recognized net of estimated forfeitures, which reduce the expense recorded in the consolidated statements of operations. The selection of applicable estimated forfeiture rates is based on an evaluation of trends in our historical forfeiture data with consideration for other potential driving factors. If in subsequent periods actual forfeitures significantly differ from our initial estimates, we will revise such estimates accordingly. The following two tables separately present stock-based compensation expense both by award type and classification in our consolidated statements of operations (in thousands): Expense - By Award Type Fiscal Quarter Ended December 27, December 28, Compensation expense - by type Stock options $ 4,546 $ 5,022 Restricted stock units 16,967 15,375 Employee stock purchase plan 1,101 1,085 Total stock-based compensation 22,614 21,482 Benefit from income taxes (3,594 ) (3,760 ) Total stock-based compensation, net of tax $ 19,020 $ 17,722 Expense - By Income Statement Line Item Classification Fiscal Quarter Ended December 27, December 28, Compensation expense - by classification Cost of products and services $ 543 $ 488 Research and development 6,987 6,241 Sales and marketing 8,174 8,217 General and administrative 6,910 6,536 Total stock-based compensation expense 22,614 21,482 Benefit from income taxes (3,594 ) (3,760 ) Total stock-based compensation, net of tax $ 19,020 $ 17,722 The tax benefit that we recognize from shares issued under our ESPP is excluded from the tables above. This benefit was as follows (in thousands): Fiscal Quarter Ended December 27, December 28, Tax benefit - shares issued under ESPP $ 202 $ 142 Unrecognized Compensation Expense. At December 27, 2019 , total unrecorded compensation expense associated with employee stock options expected to vest was approximately $33.2 million , which is expected to be recognized over a weighted-average period of 2.7 years. At December 27, 2019 , total unrecorded compensation expense associated with RSUs expected to vest was approximately $156.8 million , which is expected to be recognized over a weighted-average period of 3.0 years. Common Stock Repurchase Program In November 2009, we announced a stock repurchase program ("program"), providing for the repurchase of up to $250.0 million of our Class A common stock. The following table summarizes the initial amount of authorized repurchases as well as additional repurchases approved by our Board of Directors as of December 27, 2019 (in thousands): Authorization Period Authorization Amount Fiscal 2010: November 2009 $ 250,000 Fiscal 2010: July 2010 300,000 Fiscal 2011: July 2011 250,000 Fiscal 2012: February 2012 100,000 Fiscal 2015: October 2014 200,000 Fiscal 2017: January 2017 200,000 Fiscal 2018: July 2018 350,000 Fiscal 2019: July 2019 350,000 Total $ 2,000,000 Stock repurchases under the program may be made through open market transactions, negotiated purchases, or otherwise, at times and in amounts that we consider appropriate. The timing of repurchases and the number of shares repurchased depend upon a variety of factors, including price, regulatory requirements, the rate of dilution from our equity compensation plans, and other market conditions. The program does not have a specified expiration date, and can be limited, suspended or terminated at our discretion at any time without prior notice. Shares repurchased under the program will be returned to the status of authorized but unissued shares of Class A common stock. As of December 27, 2019 , the remaining authorization to purchase additional shares is approximately $331 million . The following table provides information regarding share repurchase activity under the program during fiscal 2020 : Quarterly Repurchase Activity Shares Repurchased Cost in thousands (1) Average Price Paid Per Share (2) Q1 - Quarter ended December 27, 2019 432,042 $ 30,003 $ 69.44 Total 432,042 $ 30,003 (1) Cost of share repurchases includes the price paid per share and applicable commissions. (2) Average price paid per share excludes commission costs. Dividend Program The following table summarizes dividends declared under the program in relation to fiscal 2020 : Fiscal Period Announcement Date Record Date Payment Date Cash Dividend Per Common Share Dividend Payment Fiscal 2020 Q1 - Quarter ended December 27, 2019 January 29, 2020 February 10, 2020 February 20, 2020 $ 0.22 $22.2 million (1) (1) The amount of the dividend payment is estimated based on the number of shares of our Class A and Class B common stock that we estimate will be outstanding as of the Record Date.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	3 Months Ended
	Dec. 27, 2019
Equity [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income Other comprehensive income consists of three components: unrealized gains or losses on our AFS marketable investment securities, gains and losses on derivatives in cash flow hedge relationships not yet recognized in earnings, and the gains and losses from the translation of assets and liabilities denominated in non-U.S. dollar functional currencies. Until realized and reported as a component of net income, these comprehensive income items accumulate and are included within accumulated other comprehensive income, a subsection within stockholders’ equity in our consolidated balance sheets. Unrealized gains and losses on our investment securities are reclassified from AOCI into earnings when realized upon sale and are determined based on specific identification of securities sold. Unrealized gains and losses on our cash flow hedges are reclassified from AOCI into earnings when the hedged operating expenses are recognized. The following table summarizes the changes in the accumulated balances during the period, and includes information regarding the manner in which the reclassifications out of AOCI into earnings affect our consolidated statements of operations (in thousands): Fiscal Quarter Ended Investment Securities Cash Flow Hedges Currency Translation Adjustments Total Beginning Balance $ 2,198 $ — $ (22,823 ) $ (20,625 ) Other comprehensive income before reclassifications: Unrealized gains/(losses) (2,209 ) 315 — (1,894 ) Foreign currency translation gains/(losses) (1) — — 3,403 3,403 Income tax effect - benefit/(expense) — (37 ) 40 3 Net of tax (2,209 ) 278 3,443 1,512 Amounts reclassified from AOCI into earnings: Realized gains/(losses) (1) 1,308 6 — 1,314 Income tax effect - benefit/(expense) (2) (261 ) — — (261 ) Net of tax 1,047 6 — 1,053 Net current-period other comprehensive income/(loss) (1,162 ) 284 3,443 2,565 Ending Balance $ 1,036 $ 284 $ (19,380 ) $ (18,060 ) Fiscal Quarter Ended Investment Securities Cash Flow Hedges Currency Translation Adjustments Total Beginning Balance $ (2,948 ) $ — $ (12,884 ) $ (15,832 ) Other comprehensive income before reclassifications: Unrealized gains/(losses) 931 — — 931 Foreign currency translation gains/(losses) (1) — — (3,577 ) (3,577 ) Income tax effect - benefit/(expense) — — — — Net of tax 931 — (3,577 ) (2,646 ) Amounts reclassified from AOCI into earnings: Realized gains/(losses) (1) (201 ) — — (201 ) Income tax effect - benefit/(expense) (2) 40 — — 40 Net of tax (161 ) — — (161 ) Net current-period other comprehensive income/(loss) 770 — (3,577 ) (2,807 ) Ending Balance $ (2,178 ) $ — $ (16,461 ) $ (18,639 ) (1) Realized gains or losses, if any, from the sale of our AFS investment securities or from foreign currency translation adjustments are included within other income/expense, net in our consolidated statements of operations. Realized gains or losses on cash flow hedges are included in operating expenses together with the hedged item. (2) The income tax benefit or expense is included within provision for income taxes in our consolidated statements of operations.

Earnings Per Share

Earnings Per Share	3 Months Ended
	Dec. 28, 2018
Earnings Per Share [Abstract]
Earnings Per Share	. Earnings Per Share Basic EPS is computed by dividing net income attributable to Dolby Laboratories, Inc. by the number of weighted-average shares of Class A and Class B common stock outstanding during the period. Through application of the treasury stock method, diluted EPS is computed in the same manner, except that the number of weighted-average shares outstanding is increased by the number of potentially dilutive shares from employee incentive plans during the period. Basic and diluted EPS are computed independently for each fiscal quarter and year-to-date period, which involves the use of different weighted-average share count figures relating to quarterly and annual periods. As a result, and after factoring the effect of rounding to the nearest cent per share, the sum of all four quarter-to-date EPS figures may not equal year-to-date EPS. Potentially dilutive shares represent the hypothetical number of incremental shares issuable under the assumed exercise of outstanding stock options (both vested and non-vested) and vesting of outstanding RSUs. The calculation of dilutive shares outstanding excludes out-of-the-money stock options. The following table sets forth the computation of basic and diluted EPS attributable to Dolby Laboratories, Inc. (in thousands, except per share amounts): Fiscal Quarter Ended December 27, December 28, Numerator: Net income attributable to Dolby Laboratories, Inc. $ 48,753 $ 98,219 Denominator: Weighted-average shares outstanding—basic 100,336 102,677 Potential common shares from options to purchase common stock 1,711 2,251 Potential common shares from restricted stock units 1,020 1,202 Potential common shares from ESPP 11 — Weighted-average shares outstanding—diluted 103,078 106,130 Net income per share attributable to Dolby Laboratories, Inc.: Basic $ 0.49 $ 0.96 Diluted $ 0.47 $ 0.93 Antidilutive awards excluded from calculation: Stock options 2,623 1,583 Restricted stock units 8 10 ESPP 3 —

Income Taxes

Income Taxes	3 Months Ended
	Dec. 27, 2019
Income Tax Disclosure [Abstract]
Income Taxes	. Income Taxes Our income tax expense, deferred tax assets and liabilities, and reserves for unrecognized tax benefits reflect management's best assessment of estimated current and future taxes to be paid. We are subject to income taxes in the United States and numerous foreign jurisdictions. Significant judgments and estimates are required in determining the consolidated income tax expense. Unrecognized Tax Benefit As of December 27, 2019 , the total amount of gross unrecognized tax benefits was $110.2 million , of which $74.5 million , if recognized, would reduce our effective tax rate. As of September 27, 2019 , the total amount of gross unrecognized tax benefits was $108.5 million , of which $72.8 million , if recognized, would reduce our effective tax rate. Our net liability for unrecognized tax benefits is classified within other non-current liabilities in our consolidated balance sheets. Effective Tax Rate Each period, a combination of different factors can impact our effective tax rate. These factors include both recurring items such as tax rates and the relative amount of income earned in foreign jurisdictions, as well as discrete items such as changes to our uncertain tax positions, that may occur in, but are not necessarily consistent between periods. Our effective tax rate in the first quarter of fiscal 2020 was 10.8% or a tax expense of $5.9 million , compared to our Federal statutory rate of 21% . The decrease from the Federal statutory rate was primarily due to tax benefits relating to stock-based compensation. Compared to our effective tax rate in the first quarter of fiscal 2019 of (32.5)% or a tax benefit of $24.1 million , the increase in our tax expense was primarily due to a benefit in fiscal 2019 related to a reduction to our provisional Tax Act amount which did not recur in fiscal 2020.

Restructuring

Restructuring	3 Months Ended
	Dec. 27, 2019
Restructuring Charges [Abstract]
Restructuring	Restructuring Restructuring charges recorded in our statements of operations represent costs associated with separate individual restructuring plans implemented in various fiscal periods. Costs arising from these actions, including fluctuations in related balances between fiscal periods, are based on the nature of activities under the various plans. Fiscal 2019 Restructuring Events. In fiscal 2019, we recorded charges as a result of our early exit of a leased facility. In addition, we recorded charges associated with a strategic reorganization of our marketing function that resulted in severance and other related benefits provided to the affected employees. As a result of these events, we recorded a total of $36.6 million in restructuring costs in fiscal 2019 and they are reflected as such in the accompanying consolidated statement of operations. The table presented below summarizes changes in restructuring accruals under these plans (in thousands): Severance Leased facility exit costs Fixed assets write-off Other associated costs Total Balance at September 28, 2018 $ — $ — $ — $ 124 $ 124 Restructuring charges/(credits) 3,134 18,261 15,216 (53 ) 36,558 Cash payments (3,006 ) (4,577 ) — (130 ) (7,713 ) Non-cash and other adjustments — 2,039 (15,216 ) 59 (13,118 ) Balance at September 27, 2019 $ 128 $ 15,723 $ — $ — $ 15,851 Restructuring charges — 675 — — 675 Cash payments (72 ) (8,502 ) — — (8,574 ) Non-cash and other adjustments 158 24 — — 182 Balance at December 27, 2019 $ 214 $ 7,920 $ — $ — $ 8,134 Accruals for restructuring charges incurred for the restructuring plans described above are included within accrued liabilities in our consolidated balance sheets while restructuring charges/(credits) are included within restructuring charges/(credits) in our condensed consolidated statements of operations.

Legal Proceedings

Legal Proceedings	3 Months Ended
	Dec. 27, 2019
Loss Contingency, Information about Litigation Matters [Abstract]
Legal Proceedings	. Legal Matters We are involved in various legal proceedings that occasionally arise in the normal course of business. These can include claims of alleged infringement of IP rights, commercial, employment, and other matters. In our opinion, resolution of these proceedings is not expected to have a material adverse impact on our operating results or financial condition. Given the unpredictable nature of legal proceedings, it is possible that an unfavorable resolution of one or more such proceedings could materially affect our future operating results or financial condition in a particular period, including as a result of required changes to our licensing terms, monetary penalties, and other potential consequences. However, based on the information known by us as of the date of this filing, any such amounts are either immaterial, or it is not feasible to provide an estimate of any such potential loss. and the rules and regulations applicable to the preparation of our consolidated financial statements, any such amounts are either immaterial, or it is not possible to provide an estimate of any such potential losses.

Commitments And Contingencies

Commitments And Contingencies	3 Months Ended
	Dec. 27, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies	. Commitments & Contingencies In the ordinary course of business, we enter into contractual agreements with third parties that include non-cancelable payment obligations, for which we are liable in future periods. These arrangements can include terms binding us to minimum payments and/or penalties if we terminate the agreement for any reason other than an event of default as described by the agreement. The following table presents a summary of our contractual obligations and commitments as of December 27, 2019 (in thousands): Payments Due By Fiscal Period Remainder of Fiscal 2020 Fiscal Fiscal Fiscal Fiscal Thereafter Total Naming rights $ 3,954 $ 8,008 $ 8,108 $ 8,209 $ 8,312 $ 70,344 $ 106,935 Purchase obligations 23,161 4,615 2,176 — — — 29,952 Donation commitments 4,077 141 141 141 141 1,059 5,700 Total $ 31,192 $ 12,764 $ 10,425 $ 8,350 $ 8,453 $ 71,403 $ 142,587 Naming Rights. We are party to an agreement for naming rights and related benefits with respect to the Dolby Theatre in Hollywood, California, the location of the Academy Awards®. The term of the agreement is 20 years, over which we will make payments on a semi-annual basis until fiscal 2032. Our payment obligations are conditioned in part on the Academy Awards being held and broadcast from the Dolby Theatre. Purchase Obligations. Purchase obligations primarily consist of our commitments made under agreements to purchase goods and services related to Dolby Cinema and for purposes that include IT and telecommunications, marketing and professional services, and manufacturing and other R&D activities. Donation Commitments. Our donation commitments relate to non-cancelable obligations to the Museum of the Academy of Motion Picture Arts and Sciences in Los Angeles, California, and the Smithsonian Institution in Washington, DC. Our commitment to the Museum of the Academy of Motion Picture Arts and Sciences is for 15 years from its expected opening date in fiscal 2020 , and the Smithsonian Institution is for the next 5 years. Both donation commitments consist of the installation of imaging and audio products in its theaters and providing maintenance services in exchange for various marketing, branding, and publicity benefits. Indemnification Clauses. On a limited basis, our contractual agreements contain a clause under which we agree to provide indemnification to the counterparty, most commonly to licensees in connection with licensing arrangements that include our IP. We have also entered into indemnification agreements with our officers, directors, and certain employees, and our certificate of incorporation and bylaws contain similar indemnification obligations. Additionally, and although not a contractual requirement, we have at times elected to defend our licensees from third party IP infringement claims. Since the terms and conditions of our contractual indemnification clauses do not explicitly specify our obligations, we are unable to reasonably estimate the maximum potential exposure for which we could be liable. Furthermore, we have not historically made any payments in connection with any such obligation and believe there to be a remote likelihood that any potential exposure in future periods would be of a material amount. As a result, no amounts have been accrued in our consolidated financial statements with respect to the contingent aspect of these indemnities.

Subsequent Events

Subsequent Events	3 Months Ended
	Dec. 27, 2019
Subsequent Events [Abstract]
Subsequent Events [Text Block]	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;font-weight:bold;"> </font><font style="font-family:Arial;font-size:10pt;font-weight:bold;">Subsequent Events</font><font style="font-family:Arial;font-size:10pt;font-weight:bold;"> </font></div></div>

Summary Of Significant Accoun_2

Summary Of Significant Accounting Policies (Policy)	3 Months Ended
	Dec. 27, 2019
Accounting Policies [Abstract]
Principles Of Consolidation	Principles of Consolidation The unaudited interim condensed consolidated financial statements include the accounts of Dolby Laboratories, Inc. and our wholly owned subsidiaries. In addition, we have consolidated the financial results of jointly owned affiliated companies in which our principal stockholder has a controlling interest. We report these controlling interests as a separate line in our consolidated statements of operations as net income attributable to controlling interest and in our consolidated balance sheets as a controlling interest. We eliminate all intercompany accounts and transactions upon consolidation.
Operating Segments	Operating Segments Since we operate as a single reporting segment, all required financial segment information is included in our unaudited interim condensed consolidated financial statements. This reflects the fact that our CODM, our Chief Executive Officer, evaluates our financial information and resources, and assesses the performance of these resources on a consolidated basis.
Use of Estimates	Use of Estimates The preparation of our financial statements in accordance with U.S. GAAP requires management to make certain estimates and assumptions that affect the amounts reported and disclosed in our unaudited interim condensed consolidated financial statements and accompanying notes. Significant items subject to such estimates and assumptions include estimated shipments by our licensees for which we are owed a sales–based royalty, estimated selling prices for performance obligations within revenue arrangements; valuation allowances for accounts receivable; carrying values of inventories and certain property, plant, and equipment, goodwill and intangible assets; fair values of investments; accrued liabilities including liabilities for unrecognized tax benefits, deferred income tax assets and liabilities, and stock-based compensation. Actual results could differ from our estimates.
Fiscal Year	Fiscal Year Our fiscal year is a 52 or 53 week period ending on the last Friday in September. The fiscal periods presented herein include the 13 week periods ended December 27, 2019 and December 28, 2018 . Our fiscal year ending September 25, 2020 (fiscal 2020 ) and our fiscal year ended September 27, 2019 (fiscal 2019 ) both consist of 52 weeks.
Reclassifications	. Reclassifications We have reclassified certain prior period amounts within our consolidated financial statements and accompanying notes to conform to our current period presentation. These reclassifications did not affect total revenue, operating income, or net income.
Recently Issued Accounting Policies	Recently Issued Accounting Standards Adopted Standards At the beginning of fiscal 2020, we adopted the following standards: Leases. In the first quarter of fiscal 2020, we adopted ASU 2016-02, Leases (ASC 842 ) along with all subsequent applicable ASU clarifications and improvements , which requires lessees to recognize leases on balance sheet and disclose key information about leasing arrangements. We adopted ASC 842 using the modified retrospective transition method and used the effective date as the date of initial application. Consequently, financial information is not updated and the disclosures required under ASC 842 are not provided for dates and periods prior to implementation. ASC 842 provides a number of optional practical expedients in transition. We elected the “package of practical expedients,” which permits us not to reassess under ASC 842 our prior conclusions about lease identification, lease classification and initial direct costs. In addition, we account for lease and non-lease components as a single lease component. Operating leases are included in operating lease right-of-use assets, operating lease liabilities, current and non-current operating lease liabilities, and non-current operating lease liabilities on our interim condensed consolidated balance sheets. As a lessee, the adoption of ASC 842 resulted in the recording of Operating lease right-of-use ("ROU") assets and Operating lease liabilities of $62.1 million and $64.6 million , respectively, as of September 28, 2019. The difference between the operating lease assets and liabilities was recorded as an adjustment to Other non-current liabilities, primarily related to deferred rent and other lease incentives. As a lessor, the adoption of ASC 842 did not have a material impact. The adoption of ASC 842 did not impact Retained Earnings. Income Taxes: Comprehensive Income. During the first quarter of fiscal 2020, we adopted ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects From Accumulated Other Comprehensive Income, which allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Act. We elected to not reclassify the stranded tax effects to retained earnings as they were not material to Dolby's consolidated financial statements. Standards Not Yet Effective Collaborative Arrangements. In November 2018, the FASB issued ASU 2018-18, Collaborative Arrangements (Topic 808): Clarifying the Interaction between Topic 808 and Topic 606 , which clarifies that certain transactions between participants in a collaborative arrangement should be accounted for under ASC 606 when the counterparty is a customer. In addition, ASU 2018-18 precludes an entity from presenting consideration from a transaction in a collaborative arrangement as revenue from contracts with customers if the counterparty is not a customer for that transaction. This standard will be effective for Dolby beginning September 26, 2020, and we do not currently plan to early adopt. We do not believe that this standard will have a material impact on our consolidated financial statements.

Summary Of Significant Accoun_3

Summary Of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Dec. 27, 2019
Accounting Policies [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	.

Revenue Recognition (Tables)

Revenue Recognition (Tables)	3 Months Ended
	Dec. 27, 2019
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following table presents a summary of the composition of our revenue for all periods presented: Fiscal Quarter Ended Revenue December 27, 2019 December 28, 2018 Licensing $ 257,683 88 % $ 260,279 86 % Products and services 34,194 12 % 42,097 14 % Total revenue $ 291,877 100 % $ 302,376 100 % The following table presents the composition of our licensing revenue for all periods presented: Fiscal Quarter Ended Market December 27, 2019 December 28, 2018 Broadcast $ 102,133 40 % $ 100,138 38 % Mobile 34,481 13 % 34,173 13 % CE 48,845 19 % 43,750 17 % PC 31,843 12 % 23,157 9 % Other 40,381 16 % 59,061 23 % Total licensing revenue $ 257,683 100 % $ 260,279 100 % We license our technologies in approximately 60 countries, and our licensees distribute products that incorporate our technologies throughout the world. As shown in the table below, we generate the majority of our revenue from outside the United States. Geographic data for our licensing revenue is based on the location of our licensees’ headquarters, products revenue is based on the destination to which we ship our products, and services revenue is based on the location where services are performed. Fiscal Quarter Ended Revenue By Geographic Location December 27, 2019 December 28, 2018 United States $ 107,627 37 % $ 119,799 40 % International 184,250 63 % 182,577 60 % Total revenue $ 291,877 100 % $ 302,376 100 %
Contract with Customer, Asset and Liability	The following table presents a summary of the balances to which contract assets and liabilities related to revenue are recorded for all periods presented: December 27, 2019 September 27, 2019 Change ($) Change (%) Accounts receivable, net $ 191,001 $ 189,115 $ 1,886 1 % Contract assets 204,963 195,651 9,312 5 % Contract liabilities - current 19,785 19,991 (206 ) (1 )% Contract liabilities - non-current 23,917 24,404 (487 ) (2 )%

Composition Of Certain Financ_2

Composition Of Certain Financial Statement Captions (Tables)	3 Months Ended
	Dec. 27, 2019
Composition Of Certain Financial Statement Captions [Abstract]
Schedule Of Accounts Receivable	Accounts Receivable December 27, September 27, Trade accounts receivable $ 148,625 $ 151,996 Accounts receivable from patent administration program licensees 51,274 46,894 Accounts receivable, gross 199,899 198,890 Less: allowance for doubtful accounts (8,898 ) (9,775 ) Total $ 191,001 $ 189,115
Schedule Of Inventories	Inventories December 27, September 27, Raw materials $ 6,933 $ 8,031 Work in process 4,432 4,872 Finished goods 17,739 19,428 Total $ 29,104 $ 32,331
Schedule Of Prepaid Expenses And Other Current Assets	Prepaid Expenses And Other Current Assets December 27, September 27, Prepaid expenses $ 28,774 $ 17,997 Other current assets 23,105 20,924 Income tax receivable 672 783 Total $ 52,551 $ 39,704
Schedule Of Accrued Liabilities	Accrued Liabilities December 27, September 27, Accrued royalties $ 3,107 $ 2,957 Amounts payable to patent administration program partners 58,015 58,899 Accrued compensation and benefits 60,698 78,716 Accrued professional fees 16,165 19,216 Unpaid PP&E additions 14,350 15,332 Accrued customer refunds 18,222 24,299 Other accrued liabilities 71,495 68,725 Total $ 242,052 $ 268,144
Schedule Of Other Non-Current Liabilities	Other Non-Current Liabilities December 27, September 27, Supplemental retirement plan obligations $ 3,649 $ 3,466 Non-current tax liabilities (1) 138,305 136,323 Other liabilities 37,268 37,673 Total $ 179,222 $ 177,462

Investments & Fair Value Meas_2

Investments & Fair Value Measurements (Tables)	3 Months Ended
	Dec. 27, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Schedule Of Financial Assets and Liabilities Carried At Fair Value	Our cash and investment portfolio consisted of the following (in thousands): December 27, 2019 Cost Unrealized Estimated Fair Value Gains Losses Total Level 1 Level 2 Level 3 Cash and cash equivalents: Cash $ 719,126 $ — $ — $ 719,126 $ 719,126 $ — $ — Cash equivalents: Money market funds 22,303 — — 22,303 22,303 — — Cash and cash equivalents 741,429 — — 741,429 741,429 — — Short-term investments: Certificate of deposit 4,730 — (2 ) 4,728 — 4,728 — U.S. agency securities 6,396 4 (1 ) 6,399 — 6,399 — Government bonds 44,911 15 — 44,926 41,658 3,268 — Commercial paper 15,884 4 (8 ) 15,880 — 15,880 — Corporate bonds 83,679 153 (22 ) 83,810 — 83,810 — Municipal debt securities 14,470 22 (1 ) 14,491 — 14,491 — Short-term investments 170,070 198 (34 ) 170,234 41,658 128,576 — Long-term investments: U.S. agency securities 8,704 132 (1 ) 8,835 — 8,835 — Government bonds 26,219 78 (20 ) 26,277 22,865 3,412 — Corporate bonds 91,812 759 (88 ) 92,483 — 92,483 — Municipal debt securities 12,532 99 (1 ) 12,630 — 12,630 — Other long-term investments (1) 1,495 — — 1,495 — — — Long-term investments 140,762 1,068 (110 ) 141,720 22,865 117,360 — Total cash, cash equivalents, and investments $ 1,052,261 $ 1,266 $ (144 ) $ 1,053,383 $ 805,952 $ 245,936 $ — Investments held in supplemental retirement plan: Assets 3,746 — — 3,746 3,746 — — Included in prepaid expenses and other current assets & other non-current assets Liabilities 3,746 — — 3,746 3,746 — — Included in accrued liabilities & other non-current liabilities Currency derivatives as hedge instruments: Assets — 426 — 426 — 426 — Included in other current assets Liabilities — — (62 ) (62 ) — (62 ) — Included in other accrued expenses (1) Other long-term investments as of December 27, 2019 include investments that are not carried at fair value including an equity method investment of $1.5 million September 27, 2019 Cost Unrealized Estimated Fair Value Gains Losses Total Level 1 Level 2 Level 3 Cash and cash equivalents: Cash $ 680,287 $ — $ — $ 680,287 $ 680,287 $ — $ — Cash equivalents: Corporate bonds 1,000 — — 1,000 — 1,000 — Money market funds 115,270 — — 115,270 115,270 — — Government bonds 653 — — 653 653 — — Cash and cash equivalents 797,210 — — 797,210 796,210 1,000 — Short-term investments: Certificate of deposit 1,265 1 — 1,266 — 1,266 — U.S. agency securities 10,973 8 (9 ) 10,972 — 10,972 — Government bonds 8,381 11 (1 ) 8,391 5,784 2,607 — Commercial paper 6,347 9 — 6,356 — 6,356 — Corporate bonds 76,802 172 (34 ) 76,940 — 76,940 — Municipal debt securities 15,210 18 (7 ) 15,221 — 15,221 — Short-term investments 118,978 219 (51 ) 119,146 5,784 113,362 — Long-term investments: Asset backed securities 400 2 — 402 — 402 — U.S. agency securities 7,102 146 — 7,248 — 7,248 — Government bonds 23,563 187 — 23,750 19,670 4,080 — Corporate bonds 134,360 1,700 — 136,060 — 136,060 — Municipal debt securities 10,315 87 (6 ) 10,396 — 10,396 — Other long-term investments (1) 1,731 — — 1,731 — — — Long-term investments 177,471 2,122 (6 ) 179,587 19,670 158,186 — Total cash, cash equivalents, and investments $ 1,093,659 $ 2,341 $ (57 ) $ 1,095,943 $ 821,664 $ 272,548 $ — Investments held in supplemental retirement plan: Assets 3,564 — — 3,564 3,564 — — Included in prepaid expenses and other current assets & other non-current assets Liabilities 3,564 — — 3,564 3,564 — — Included in accrued liabilities & other non-current liabilities Currency derivatives as hedge instruments: Assets — — — — — — — Included in other current assets Liabilities — — (242 ) (242 ) — (242 ) — Included in other accrued expenses (1) Other long-term investments as of September 27, 2019 include an investment that is not carried at fair value including an equity method investment of $1.7 million .
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	The following table presents the gross unrealized losses and fair value for those AFS securities that were in an unrealized loss position for less than twelve months and for twelve months or greater as of December 27, 2019 and September 27, 2019 (in thousands): December 27, 2019 September 27, 2019 Less Than 12 Months 12 Months Or Greater Less Than 12 Months 12 Months Or Greater Investment Type Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Certificate of deposit $ 4,298 $ (2 ) $ — $ — $ 300 $ — $ — $ — U.S. agency securities 333 — 4,797 (1 ) — — 4,787 (9 ) Government bonds 38,385 (21 ) — — 1,426 — — — Commercial paper 11,787 (9 ) — — — — — — Corporate bonds 36,756 (100 ) 11,374 (10 ) 7,647 (3 ) 27,078 (32 ) Municipal debt securities 3,968 (2 ) — — 9,552 (13 ) 900 — Total $ 95,527 $ (134 ) $ 16,171 $ (11 ) $ 18,925 $ (16 ) $ 32,765 $ (41 )
Available-for-sale Securities	The following table summarizes the amortized cost and estimated fair value of the AFS securities within our investment portfolio based on stated maturities as of December 27, 2019 and September 27, 2019 , which are recorded within cash equivalents and both short and long-term investments in our consolidated balance sheets (in thousands): December 27, 2019 September 27, 2019 Range of maturity Amortized Cost Fair Value Amortized Cost Fair Value Due within 1 year $ 192,373 $ 192,537 $ 238,186 $ 238,354 Due in 1 to 2 years 57,931 58,481 93,948 94,899 Due in 2 to 3 years 81,337 81,744 81,793 82,957 Total $ 331,641 $ 332,762 $ 413,927 $ 416,210

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	3 Months Ended
	Dec. 27, 2019
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, plant, and equipment are recorded at cost, with depreciation expense included in cost of licensing, cost of products and services, R&D, S&M, and G&A expenses in our consolidated statements of operations. PP&E consist of the following (in thousands): December 27, September 27, Land $ 41,980 $ 41,918 Buildings and building improvements 283,462 282,924 Leasehold improvements 67,253 66,730 Machinery and equipment 127,183 128,525 Computer equipment and software 219,773 219,455 Furniture and fixtures 31,571 34,191 Equipment provided under operating leases 174,155 161,372 Construction-in-progress 32,251 19,616 Property, plant, and equipment, gross 977,628 954,731 Less: accumulated depreciation (428,133 ) (417,299 ) Property, plant, & equipment, net $ 549,495 $ 537,432

Leases (Tables)

Leases (Tables)	3 Months Ended
	Dec. 27, 2019
Leases [Abstract]
Lease Cost Components, Supplemental Cash Flow Information and Supplemental Balance Sheet Information Schedules	The components of lease expense were as follows (in thousands): Fiscal Quarter Ended December 27, 2019 Lease cost Operating lease cost 5,356 Variable lease cost 394 Total lease cost 5,750 Supplemental balance sheet information related to leases was as follows: December 27, 2019 Weighted-average remaining lease term Operating leases 7.3 years Weighted-average discount rate Operating leases 3.4 % Supplemental cash flow information related to leases was as follows (in thousands): Fiscal Quarter Ended December 27, 2019 Other information Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases 5,241 Right-of-use assets obtained in exchange for lease obligations: Operating lease liabilities 12,816
Maturities of Lessee Lease Liabilities after Adoption of 842 Schedule	The following table presents the maturity analysis of lease liabilities (in thousands): December 27, 2019 September 27, 2019 Operating Leases Operating Leases Remainder of Fiscal 2020 15,386 17,231 Fiscal 2021 13,643 9,329 Fiscal 2022 11,336 7,191 Fiscal 2023 9,375 6,218 Fiscal 2024 6,703 4,499 Thereafter 29,320 12,355 Total undiscounted lease payments 85,763 56,823 Less: imputed interest (12,174 ) Total lease liabilities 73,589
Maturities of Lessee Lease Liabilities before Adoption of 842 Schedule	The following table presents the maturity analysis of lease liabilities (in thousands): December 27, 2019 September 27, 2019 Operating Leases Operating Leases Remainder of Fiscal 2020 15,386 17,231 Fiscal 2021 13,643 9,329 Fiscal 2022 11,336 7,191 Fiscal 2023 9,375 6,218 Fiscal 2024 6,703 4,499 Thereafter 29,320 12,355 Total undiscounted lease payments 85,763 56,823 Less: imputed interest (12,174 ) Total lease liabilities 73,589
Maturities of Lessor Operating Lease Payments Schedule	The following table presents the maturity analysis of lease payments due to Dolby (in thousands): December 27, 2019 Operating Leases Sales-Type Leases Remainder of Fiscal 2020 1,669 4,059 Fiscal 2021 2,227 1,595 Fiscal 2022 2,227 1,595 Fiscal 2023 2,153 1,595 Fiscal 2024 1,107 795 Thereafter — 790 Total undiscounted cash flows 9,383 10,429 Less: present value of lease payments (recognized as lease receivables) (8,095 ) Difference 2,334
Maturities of Lessor Sales-Type Lease Payments Schedule	The following table presents the maturity analysis of lease payments due to Dolby (in thousands): December 27, 2019 Operating Leases Sales-Type Leases Remainder of Fiscal 2020 1,669 4,059 Fiscal 2021 2,227 1,595 Fiscal 2022 2,227 1,595 Fiscal 2023 2,153 1,595 Fiscal 2024 1,107 795 Thereafter — 790 Total undiscounted cash flows 9,383 10,429 Less: present value of lease payments (recognized as lease receivables) (8,095 ) Difference 2,334

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	3 Months Ended
	Dec. 27, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The following table outlines changes to the carrying amount of goodwill (in thousands): Goodwill Balance at September 27, 2019 $ 334,829 Acquired goodwill — Translation adjustments 614 Balance at December 27, 2019 $ 335,443
Schedule of Finite-Lived Intangible Assets	Intangible assets subject to amortization consist of the following (in thousands): December 27, 2019 September 27, 2019 Intangible Assets Cost Accumulated Amortization Net Cost Accumulated Amortization Net Acquired patents and technology $ 340,519 $ (183,283 ) $ 157,236 $ 338,075 $ (176,867 ) $ 161,208 Customer relationships 64,718 (46,417 ) 18,301 64,728 (45,510 ) 19,218 Other intangibles 22,942 (22,498 ) 444 22,902 (22,437 ) 465 Total $ 428,179 $ (252,198 ) $ 175,981 $ 425,705 $ (244,814 ) $ 180,891 With regard to our purchase of intangible assets during the periods presented, the following table summarizes the consideration paid, the weighted-average useful lives over which the acquired assets will be amortized using the greater of either the straight-line basis or a ratio-to-revenue method, and the classification of their amortized expense in our consolidated statements of operations: Fiscal Period Total Purchase Consideration (1) Weighted-Average Useful Life (in millions) (in years) Fiscal 2019 Q1 - Quarter ended December 28, 2018 $12.1 11.6 Fiscal 2020 Q1 - Quarter ended December 27, 2019 $2.9 14.0 (1) Amortization expense on the intangible assets from patent portfolio and business acquisitions is included within cost of revenue, R&D, and G&A in our consolidated statements of operations.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	As of December 27, 2019 , estimated amortization expense in future fiscal periods was as follows (in thousands): Fiscal Year Amortization Expense (in thousands) Remainder of 2020 $ 22,346 2021 29,585 2022 27,580 2023 23,898 2024 22,273 Thereafter 50,299 Total $ 175,981

Stockholders' Equity And Stoc_2

Stockholders' Equity And Stock-Based Compensation (Tables)	3 Months Ended
	Dec. 27, 2019
Stockholders' Equity And Stock-Based Compensation [Abstract]
Summary Of Stock Options Issued To Officers, Directors, And Employees Under 2000 Stock Incentive Plan And 2005 Stock Plan	The following table summarizes information about all stock options issued under our 2005 Stock Plan: Shares Weighted-Average Exercise Price Weighted-Average Remaining Contractual Life Aggregate Intrinsic Value (1) (in thousands) (in years) (in thousands) Options outstanding at September 27, 2019 7,201 $ 48.03 Grants 1,058 68.41 Exercises (441 ) 38.92 Forfeitures and cancellations (23 ) 60.18 Options outstanding at December 27, 2019 7,795 51.28 6.60 $ 132,844 Options vested and expected to vest at December 27, 2019 7,369 50.45 6.48 131,897 Options exercisable at December 27, 2019 4,633 $ 43.13 5.43 116,784 (1) Aggregate intrinsic value is based on the closing price of our Class A common stock on December 27, 2019 of $68.34 and excludes the impact of options that were not in-the-money.
Summary Of Restricted Stock Units Issued To Officers, Directors And Employees Under 2005 Stock Incentive Plan	The following table summarizes information about RSUs issued under our 2005 Stock Plan: Shares Weighted-Average Grant Date Fair Value (in thousands) Non-vested at September 27, 2019 2,805 $ 58.84 Granted 1,214 66.28 Vested (897 ) 51.77 Forfeitures (43 ) 59.23 Non-vested at December 27, 2019 3,079 $ 62.39
Schedule Of Fair Value Of Stock-Based Awards Estimated Using Weighted-Average Assumptions	The weighted-average assumptions used in the determination of the fair value of our stock options were as follows: Fiscal Quarter Ended December 27, December 28, Expected life (in years) 4.91 4.90 Risk-free interest rate 1.7 % 2.7 % Expected stock price volatility 23.9 % 22.9 % Dividend yield 1.3 % 1.1 %
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs	The following two tables separately present stock-based compensation expense both by award type and classification in our consolidated statements of operations (in thousands): Expense - By Award Type Fiscal Quarter Ended December 27, December 28, Compensation expense - by type Stock options $ 4,546 $ 5,022 Restricted stock units 16,967 15,375 Employee stock purchase plan 1,101 1,085 Total stock-based compensation 22,614 21,482 Benefit from income taxes (3,594 ) (3,760 ) Total stock-based compensation, net of tax $ 19,020 $ 17,722 Expense - By Income Statement Line Item Classification Fiscal Quarter Ended December 27, December 28, Compensation expense - by classification Cost of products and services $ 543 $ 488 Research and development 6,987 6,241 Sales and marketing 8,174 8,217 General and administrative 6,910 6,536 Total stock-based compensation expense 22,614 21,482 Benefit from income taxes (3,594 ) (3,760 ) Total stock-based compensation, net of tax $ 19,020 $ 17,722
Schedule of Tax Benefit from Exercise of Options	This benefit was as follows (in thousands): Fiscal Quarter Ended December 27, December 28, Tax benefit - shares issued under ESPP $ 202 $ 142
Schedule of Stock Repurchase Authorizations	The following table summarizes the initial amount of authorized repurchases as well as additional repurchases approved by our Board of Directors as of December 27, 2019 (in thousands): Authorization Period Authorization Amount Fiscal 2010: November 2009 $ 250,000 Fiscal 2010: July 2010 300,000 Fiscal 2011: July 2011 250,000 Fiscal 2012: February 2012 100,000 Fiscal 2015: October 2014 200,000 Fiscal 2017: January 2017 200,000 Fiscal 2018: July 2018 350,000 Fiscal 2019: July 2019 350,000 Total $ 2,000,000
Schedule of Stock Repurchase Activity	The following table provides information regarding share repurchase activity under the program during fiscal 2020 : Quarterly Repurchase Activity Shares Repurchased Cost in thousands (1) Average Price Paid Per Share (2) Q1 - Quarter ended December 27, 2019 432,042 $ 30,003 $ 69.44 Total 432,042 $ 30,003 (1) Cost of share repurchases includes the price paid per share and applicable commissions. (2) Average price paid per share excludes commission costs.
Dividends Declared	The following table summarizes dividends declared under the program in relation to fiscal 2020 : Fiscal Period Announcement Date Record Date Payment Date Cash Dividend Per Common Share Dividend Payment Fiscal 2020 Q1 - Quarter ended December 27, 2019 January 29, 2020 February 10, 2020 February 20, 2020 $ 0.22 $22.2 million (1) (1) The amount of the dividend payment is estimated based on the number of shares of our Class A and Class B common stock that we estimate will be outstanding as of the Record Date.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	3 Months Ended
	Dec. 27, 2019
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table summarizes the changes in the accumulated balances during the period, and includes information regarding the manner in which the reclassifications out of AOCI into earnings affect our consolidated statements of operations (in thousands): Fiscal Quarter Ended Investment Securities Cash Flow Hedges Currency Translation Adjustments Total Beginning Balance $ 2,198 $ — $ (22,823 ) $ (20,625 ) Other comprehensive income before reclassifications: Unrealized gains/(losses) (2,209 ) 315 — (1,894 ) Foreign currency translation gains/(losses) (1) — — 3,403 3,403 Income tax effect - benefit/(expense) — (37 ) 40 3 Net of tax (2,209 ) 278 3,443 1,512 Amounts reclassified from AOCI into earnings: Realized gains/(losses) (1) 1,308 6 — 1,314 Income tax effect - benefit/(expense) (2) (261 ) — — (261 ) Net of tax 1,047 6 — 1,053 Net current-period other comprehensive income/(loss) (1,162 ) 284 3,443 2,565 Ending Balance $ 1,036 $ 284 $ (19,380 ) $ (18,060 ) Fiscal Quarter Ended Investment Securities Cash Flow Hedges Currency Translation Adjustments Total Beginning Balance $ (2,948 ) $ — $ (12,884 ) $ (15,832 ) Other comprehensive income before reclassifications: Unrealized gains/(losses) 931 — — 931 Foreign currency translation gains/(losses) (1) — — (3,577 ) (3,577 ) Income tax effect - benefit/(expense) — — — — Net of tax 931 — (3,577 ) (2,646 ) Amounts reclassified from AOCI into earnings: Realized gains/(losses) (1) (201 ) — — (201 ) Income tax effect - benefit/(expense) (2) 40 — — 40 Net of tax (161 ) — — (161 ) Net current-period other comprehensive income/(loss) 770 — (3,577 ) (2,807 ) Ending Balance $ (2,178 ) $ — $ (16,461 ) $ (18,639 ) (1) Realized gains or losses, if any, from the sale of our AFS investment securities or from foreign currency translation adjustments are included within other income/expense, net in our consolidated statements of operations. Realized gains or losses on cash flow hedges are included in operating expenses together with the hedged item. (2) The income tax benefit or expense is included within provision for income taxes in our consolidated statements of operations.

Per Share Data (Tables)

Per Share Data (Tables)	3 Months Ended
	Dec. 28, 2018
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table sets forth the computation of basic and diluted EPS attributable to Dolby Laboratories, Inc. (in thousands, except per share amounts): Fiscal Quarter Ended December 27, December 28, Numerator: Net income attributable to Dolby Laboratories, Inc. $ 48,753 $ 98,219 Denominator: Weighted-average shares outstanding—basic 100,336 102,677 Potential common shares from options to purchase common stock 1,711 2,251 Potential common shares from restricted stock units 1,020 1,202 Potential common shares from ESPP 11 — Weighted-average shares outstanding—diluted 103,078 106,130 Net income per share attributable to Dolby Laboratories, Inc.: Basic $ 0.49 $ 0.96 Diluted $ 0.47 $ 0.93 Antidilutive awards excluded from calculation: Stock options 2,623 1,583 Restricted stock units 8 10 ESPP 3 —

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Dec. 27, 2019
Income Tax Disclosure [Abstract]
Schedule of Withholding Taxes

Restructuring (Tables)

Restructuring (Tables)	3 Months Ended
	Dec. 27, 2019
Restructuring Charges [Abstract]
Restructuring and Related Costs	Severance Leased facility exit costs Fixed assets write-off Other associated costs Total Balance at September 28, 2018 $ — $ — $ — $ 124 $ 124 Restructuring charges/(credits) 3,134 18,261 15,216 (53 ) 36,558 Cash payments (3,006 ) (4,577 ) — (130 ) (7,713 ) Non-cash and other adjustments — 2,039 (15,216 ) 59 (13,118 ) Balance at September 27, 2019 $ 128 $ 15,723 $ — $ — $ 15,851 Restructuring charges — 675 — — 675 Cash payments (72 ) (8,502 ) — — (8,574 ) Non-cash and other adjustments 158 24 — — 182 Balance at December 27, 2019 $ 214 $ 7,920 $ — $ — $ 8,134

Commitments And Contingencies (

Commitments And Contingencies (Tables)	3 Months Ended
	Dec. 27, 2019
Commitments and Contingencies Disclosure [Abstract]
Schedule Of Contractual Obligations And Commitments	The following table presents a summary of our contractual obligations and commitments as of December 27, 2019 (in thousands): Payments Due By Fiscal Period Remainder of Fiscal 2020 Fiscal Fiscal Fiscal Fiscal Thereafter Total Naming rights $ 3,954 $ 8,008 $ 8,108 $ 8,209 $ 8,312 $ 70,344 $ 106,935 Purchase obligations 23,161 4,615 2,176 — — — 29,952 Donation commitments 4,077 141 141 141 141 1,059 5,700 Total $ 31,192 $ 12,764 $ 10,425 $ 8,350 $ 8,453 $ 71,403 $ 142,587

Basis Of Presentation (Details)

Basis Of Presentation (Details)	3 Months Ended
	Dec. 27, 2019segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of weeks in fiscal year	13 years
Number of Operating Segments	1

Summary Of Significant Accoun_4

Summary Of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018	Sep. 28, 2019	Sep. 27, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 71,071		$ 62,100
Total lease liabilities	73,589		$ 64,600
Revenues	291,877	$ 302,376
Gross margin	254,562	263,747
(Provision for)/benefit from income taxes	(5,863)	24,104
Net income (loss) attributable to Dolby Laboratories, Inc.	$ 48,753	$ 98,219
Diluted (in usd per share)	$ 0.47	$ 0.93
Accounts receivable, net	$ 191,001			$ 189,115
Contract assets	204,963			195,651
Prepaid expenses and other current assets	52,551			39,704
Deferred taxes	123,284			114,075
Other non-current assets	95,282			93,395
Accrued liabilities	242,052			268,144
Contract liabilities	19,785			19,991
Non-current contract liabilities	23,917			24,404
Other non-current liabilities	179,222			177,462
Retained earnings	2,351,251			$ 2,327,877
Net income	48,591	$ 98,358
Deferred income taxes	(9,174)	(32,571)
Accounts receivable	(2,331)	17,736
Contract assets	(9,310)	(33,519)
Prepaid expenses and other assets	(13,245)	(13,157)
Accounts payable and other liabilities	(30,785)	(26,332)
Contract liabilities	(724)	(678)
Net cash provided by operating activities	$ 31,159	$ 56,952

Revenue Recognition (Performanc

Revenue Recognition (Performance Obligation) (Details) $ in Millions	3 Months Ended
	Dec. 27, 2019USD ($)country
Revenue from Contract with Customer [Abstract]
Performance obligation, description of timing	one year or less
Remaining performance obligation | $	$ 41.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Countries technologies are licensed in | country	60
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected timing of satisfaction period	1 year
Remaining performance obligation, percent	36.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected timing of satisfaction period	1 year
Remaining performance obligation, percent	24.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected timing of satisfaction period	1 year
Remaining performance obligation, percent	40.00%

Revenue Recognition Narrative (

Revenue Recognition Narrative (Details) $ in Millions	3 Months Ended
	Dec. 27, 2019USD ($)
Revenue from Contract with Customer [Abstract]
Revenue adjustment	$ 9
Revenue recognized	$ 6.8

Revenue Recognition (Schedule o

Revenue Recognition (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 291,877	$ 302,376
Revenue from contract with customer, percent	100.00%	100.00%
United States
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 107,627	$ 119,799
Revenue from contract with customer, percent	37.00%	40.00%
International
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 184,250	$ 182,577
Revenue from contract with customer, percent	63.00%	60.00%
Licensing
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 257,683	$ 260,279
Revenue from contract with customer, licensing percent	100.00%	100.00%
Revenue from contract with customer, percent	88.00%	86.00%
Products and services
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 34,194	$ 42,097
Revenue from contract with customer, percent	12.00%	14.00%
Broadcast
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 102,133	$ 100,138
Revenue from contract with customer, licensing percent	40.00%	38.00%
PC
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 31,843	$ 23,157
Revenue from contract with customer, licensing percent	12.00%	9.00%
Mobile
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 34,481	$ 34,173
Revenue from contract with customer, licensing percent	13.00%	13.00%
CE
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 48,845	$ 43,750
Revenue from contract with customer, licensing percent	19.00%	17.00%
Other
Revenue from External Customer [Line Items]
Revenue from contract with customer	$ 40,381	$ 59,061
Revenue from contract with customer, licensing percent	16.00%	23.00%

Revenue Recognition - Summary o

Revenue Recognition - Summary of Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Sep. 27, 2019
Revenue from Contract with Customer [Abstract]
Accounts Receivable, Net, Current	$ 191,001	$ 189,115
Contract assets	204,963	195,651
Other non-current assets	95,282	93,395
Contract liabilities	19,785	19,991
Non-current contract liabilities	23,917	24,404
Other non-current liabilities	179,222	$ 177,462
Change ($)
Accounts receivable, net	1,886
Contract assets	9,312
Contract liabilities - current	(206)
Contract liabilities - non-current	$ (487)
Change (%)
Accounts receivable, net	1.00%
Contract assets	5.00%
Contract liabilities - current	(1.00%)
Contract liabilities - non-current	(2.00%)

Composition Of Certain Financ_3

Composition Of Certain Financial Statement Captions (Schedule Of Accounts Receivable) (Details) - USD ($) $ in Thousands	Dec. 27, 2019	Sep. 27, 2019
Composition Of Certain Financial Statement Captions [Abstract]
Trade accounts receivable	$ 148,625	$ 151,996
Accounts receivable related to patent administration program	51,274	46,894
Accounts receivable, gross	199,899	198,890
Less: allowance for doubtful accounts	(8,898)	(9,775)
Accounts receivable, net	$ 191,001	$ 189,115

Composition Of Certain Financ_4

Composition Of Certain Financial Statement Captions (Schedule Of Inventories) (Details) - USD ($) $ in Thousands	Dec. 27, 2019	Sep. 27, 2019
Composition Of Certain Financial Statement Captions [Abstract]
Raw materials	$ 6,933	$ 8,031
Work in process	4,432	4,872
Finished goods	17,739	19,428
Inventories	$ 29,104	$ 32,331

Composition Of Certain Financ_5

Composition Of Certain Financial Statement Captions (Narrative) (Details) - USD ($) $ in Thousands	Dec. 27, 2019	Sep. 27, 2019
Composition Of Certain Financial Statement Captions [Line Items]
Raw materials	$ 6,933	$ 8,031
Other Noncurrent Assets [Member]
Composition Of Certain Financial Statement Captions [Line Items]
Raw materials	3,300	$ 3,000
Land and Building [Member] | Other Current Assets [Member]
Composition Of Certain Financial Statement Captions [Line Items]
Land and building held for sale	$ 2,200

Composition Of Certain Financ_6

Composition Of Certain Financial Statement Captions (Schedule Of Prepaid Expenses And Other Current Assets) (Details) - USD ($) $ in Thousands	Dec. 27, 2019	Sep. 27, 2019
Composition Of Certain Financial Statement Captions [Abstract]
Prepaid assets	$ 28,774	$ 17,997
Other current assets	23,105	20,924
Income tax receivable	672	783
Prepaid expenses and other current assets	$ 52,551	$ 39,704

Composition Of Certain Financ_7

Composition Of Certain Financial Statement Captions (Schedule Of Accrued Liabilities) (Details) - USD ($) $ in Thousands	Dec. 27, 2019	Sep. 27, 2019
Composition Of Certain Financial Statement Captions [Abstract]
Accrued royalties	$ 3,107	$ 2,957
Amounts payable to patent administration program partners	58,015	58,899
Accrued compensation and benefits	60,698	78,716
Accrued professional fees	16,165	19,216
Capital expenditures incurred, but not yet paid	14,350	15,332
Accrued customer refunds	18,222	24,299
Other accrued liabilities	71,495	68,725
Total	$ 242,052	$ 268,144

Composition Of Certain Financ_8

Composition Of Certain Financial Statement Captions (Schedule Of Other Non-Current Liabilities) (Details) - USD ($) $ in Thousands	Dec. 27, 2019	Sep. 27, 2019
Composition Of Certain Financial Statement Captions [Abstract]
Supplemental retirement plan obligations	$ 3,649	$ 3,466
Non-current tax liabilities	138,305	136,323
Other liabilities	37,268	37,673
Other non-current liabilities	$ 179,222	$ 177,462

Investments & Fair Value Meas_3

Investments & Fair Value Measurements (Schedule Of Financial Assets and Liabilities Carried At Fair Value) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018	Sep. 27, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure			$ 797,210
Cash Equivalents, at Carrying Value	$ 741,429
Cash and cash equivalents	741,429		797,210
Debt Securities, Available-for-sale, Unrealized Loss	0	$ 0
Debt Securities, Available-for-sale, Amortized Cost	331,641		413,927
Debt Securities, Available-for-sale	332,762		416,210
Investment Owned, Unrecognized Unrealized Depreciation	(144)		(57)
Cash Cash Equivalents And Investments Total	1,053,383		1,095,943
Financial assets carried at fair value	741,429		797,210
Restricted Cash and Cash Equivalents	11,726		8,383
Long-term investments	141,720		179,587
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	95,527		18,925
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(134)		(16)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	16,171		32,765
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(11)		(41)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	192,373		238,186
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	192,537		238,354
Available For Sale Securities Debt Maturities After One Through Two Years Amortized Cost	57,931		93,948
Available For Sale Securities Debt Maturities After One Through Two Years Fair Value	58,481		94,899
Available For Sale Securities Debt Maturities After Two Through Three Years Amortized Cost	81,337		81,793
Available For Sale Securities Debt Maturities After Two Through Three Years Fair Value	81,744		82,957
Investment Owned, at Cost	1,052,261		1,093,659
Investment Owned, Unrecognized Unrealized Appreciation	1,266		2,341
Available-for-sale Securities, Gross Unrealized Gain	0
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	741,429		796,210
Financial assets carried at fair value	805,952		821,664
Derivative Asset	0		0
Derivative Liability	0		0
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0		1,000
Financial assets carried at fair value	245,936		272,548
Derivative Asset	426		0
Derivative Liability	(62)		(242)
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset	0		0
Derivative Liability	0		0
Cash [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	719,126		680,287
Cash Equivalents, at Carrying Value	719,126
Cash [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	719,126		680,287
Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	22,303		115,270
Cash Equivalents, at Carrying Value	22,303
Money Market Funds [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	22,303		115,270
Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure			115,270
Certificates of Deposit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	4,298		300
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(2)		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0		0
U.S. Agency Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	333		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	4,797		4,787
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1)		(9)
U.S. Agency Securities [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure			0
US Government Agencies Short-term Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss	(1)
Debt Securities, Available-for-sale	6,399		10,972
Debt Securities, Available-for-sale, Unrealized Gain	4
US Government Agencies Short-term Debt Securities [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	6,399
Government Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure			653
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	38,385		1,426
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(21)		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0		0
Government Bonds [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure			653
Government Bonds [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure			0
Commercial Paper [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0		0
Investment Owned, at Cost	11,787		0
Investment Owned, Unrecognized Unrealized Appreciation	9		0
Corporate Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure			1,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	36,756		7,647
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(100)		(3)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	11,374		27,078
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(10)		(32)
Corporate Debt Securities [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure			1,000
Municipal Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(2)		(13)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0		900
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0		0
Investment Owned, at Cost	3,968		9,552
Short-term Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Unrealized Gain		219
Other Long-term Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure	1,500		1,700
Investments Held In Supplemental Retirement Plan [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets carried at fair value	3,746		3,564
Financial liabilities carried at fair value	3,746		3,564
Short-term Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss		(51)
Debt Securities, Available-for-sale, Amortized Cost			118,978
Debt Securities, Available-for-sale			119,146
Short-term Investments [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	41,658		5,784
Short-term Investments [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	128,576		113,362
Short-term Investments [Member] | Certificates of Deposit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss	(2)	0
Debt Securities, Available-for-sale, Amortized Cost	4,730		1,265
Debt Securities, Available-for-sale	4,728
Debt Securities, Available-for-sale, Unrealized Gain	0	1
Available-for-sale Securities			1,266
Short-term Investments [Member] | Certificates of Deposit [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	4,728		1,266
Short-term Investments [Member] | U.S. Agency Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Amortized Cost			10,973
Short-term Investments [Member] | US Government Agencies Short-term Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss		(9)
Debt Securities, Available-for-sale, Amortized Cost	6,396
Debt Securities, Available-for-sale, Unrealized Gain		8
Short-term Investments [Member] | US Government Agencies Short-term Debt Securities [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure			10,972
Short-term Investments [Member] | Government Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss	0	(1)
Debt Securities, Available-for-sale, Amortized Cost	44,911		8,381
Debt Securities, Available-for-sale	44,926		8,391
Debt Securities, Available-for-sale, Unrealized Gain	15	11
Short-term Investments [Member] | Government Bonds [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	41,658		5,784
Short-term Investments [Member] | Government Bonds [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	3,268		2,607
Short-term Investments [Member] | Commercial Paper [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss	(8)	0
Debt Securities, Available-for-sale, Amortized Cost	15,884		6,347
Debt Securities, Available-for-sale	15,880		6,356
Debt Securities, Available-for-sale, Unrealized Gain	4	9
Short-term Investments [Member] | Commercial Paper [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	15,880		6,356
Short-term Investments [Member] | Corporate Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss	(22)	(34)
Debt Securities, Available-for-sale, Amortized Cost	83,679		76,802
Debt Securities, Available-for-sale	83,810		76,940
Debt Securities, Available-for-sale, Unrealized Gain	153	172
Short-term Investments [Member] | Corporate Debt Securities [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	83,810		76,940
Short-term Investments [Member] | Municipal Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss	(1)	(7)
Debt Securities, Available-for-sale, Amortized Cost	14,470		15,210
Debt Securities, Available-for-sale	14,491		15,221
Debt Securities, Available-for-sale, Unrealized Gain	22	18
Short-term Investments [Member] | Municipal Bonds [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	14,491		15,221
Short-term Investments [Member] | Short-term Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss	(34)
Debt Securities, Available-for-sale, Amortized Cost	170,070
Debt Securities, Available-for-sale	170,234
Debt Securities, Available-for-sale, Unrealized Gain	198
Long-term Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Amortized Cost Basis			177,471
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax			2,122
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax			(6)
Available-for-sale Securities			179,587
Long-term Investments [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure	22,865		19,670
Long-term Investments [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure	117,360		158,186
Long-term Investments [Member] | Asset-backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Amortized Cost Basis			400
Available-for-sale Securities			402
Available-for-sale Securities, Gross Unrealized Gain		2
Available-for-sale Securities, Gross Unrealized Loss		0
Long-term Investments [Member] | Asset-backed Securities [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure			402
Long-term Investments [Member] | U.S. Agency Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Amortized Cost Basis	8,704		7,102
Available-for-sale Securities	8,835		7,248
Available-for-sale Securities, Gross Unrealized Gain	132	146
Available-for-sale Securities, Gross Unrealized Loss	(1)	0
Long-term Investments [Member] | U.S. Agency Securities [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure	8,835		7,248
Long-term Investments [Member] | Government Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Amortized Cost Basis	26,219		23,563
Available-for-sale Securities	26,277		23,750
Available-for-sale Securities, Gross Unrealized Gain	78	187
Available-for-sale Securities, Gross Unrealized Loss	(20)	0
Long-term Investments [Member] | Government Bonds [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure	22,865		19,670
Long-term Investments [Member] | Government Bonds [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure	3,412		4,080
Long-term Investments [Member] | Corporate Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Amortized Cost Basis	91,812		134,360
Available-for-sale Securities	92,483		136,060
Available-for-sale Securities, Gross Unrealized Gain	759	1,700
Available-for-sale Securities, Gross Unrealized Loss	(88)	0
Long-term Investments [Member] | Corporate Debt Securities [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure	92,483		136,060
Long-term Investments [Member] | Municipal Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Amortized Cost Basis	12,532		10,315
Available-for-sale Securities	12,630		10,396
Available-for-sale Securities, Gross Unrealized Gain	99	87
Available-for-sale Securities, Gross Unrealized Loss	(1)	(6)
Long-term Investments [Member] | Municipal Bonds [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure	12,630		10,396
Long-term Investments [Member] | Other Long-term Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,495		1,731
Available-for-sale Securities	1,495		1,731
Available-for-sale Securities, Gross Unrealized Gain	0	0
Available-for-sale Securities, Gross Unrealized Loss	0	0
Long-term Investments [Member] | Other Long-term Investments [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Noncurrent, Fair Value Disclosure	0		0
Long-term Investments [Member] | Long-term Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Amortized Cost Basis	140,762
Available-for-sale Securities	141,720
Available-for-sale Securities, Gross Unrealized Gain	1,068
Available-for-sale Securities, Gross Unrealized Loss	(110)
Derivative Financial Instruments, Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Financial Instruments, Assets, Amortized Cost Basis	0		0
Derivative Financial Instruments, Unrealized Gain	426	0
Derivative Financial Instruments, Unrealized Loss	0	0
Derivative Asset	426		0
Derivative Financial Instruments, Liabilities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Financial Instruments, Unrealized Gain	0	0
Derivative Financial Instruments, Unrealized Loss	(62)	$ (242)
Derivative Financial Instruments, Liabilities, Amortized Cost Basis	0		0
Derivative Liability	$ (62)		$ (242)

Property, Plant and Equipment_2

Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 27, 2019	Sep. 27, 2019
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	$ 977,628	$ 954,731
Less: accumulated depreciation	(428,133)	(417,299)
Property, Plant And Equipment, Net	549,495	537,432
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	41,980	41,918
Building [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	283,462	282,924
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	67,253	66,730
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	127,183	128,525
Computer Systems and Software [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	219,773	219,455
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	31,571	34,191
Equipment Leased to Other Party [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	174,155	161,372
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	$ 32,251	$ 19,616

Leases (Narrative) (Details)

Leases (Narrative) (Details) $ in Millions	3 Months Ended
	Dec. 27, 2019USD ($)
Lessor, Lease, Description [Line Items]
Lesse lease term	11 years
Lessee lease renewal term	8 years
Lessee lease termination period	1 year
Variable operating lease income	$ 7.3
Fixed operating lease income	0.7
Unguaranteed residual value of sales-type leases	$ 0.7
Minimum [Member]
Lessor, Lease, Description [Line Items]
Lessor lease term	4 years
Lessor lease renewal term	1 year
Maximum [Member]
Lessor, Lease, Description [Line Items]
Lessor lease term	10 years
Lessor lease renewal term	5 years

Leases (Lease Cost Components)

Leases (Lease Cost Components) (Details) $ in Thousands	3 Months Ended
	Dec. 27, 2019USD ($)
Leases [Abstract]
Operating lease cost	$ 5,356
Variable lease cost	394
Total lease cost	$ 5,750

Leases (Supplemental Cash Flow

Leases (Supplemental Cash Flow Information Schedule) (Details) $ in Thousands	3 Months Ended
	Dec. 27, 2019USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 5,241
Right-of-use assets obtained in exchange for lease obligations:
Operating lease liabilities	$ 12,816

Leases (Supplemental Balance Sh

Leases (Supplemental Balance Sheet Information Schedule) (Details)	Dec. 27, 2019
Weighted-average remaining lease term
Operating leases	7 years 3 months 18 days
Weighted-average discount rate
Operating leases	3.40%

Leases (Maturities of Lessee Le

Leases (Maturities of Lessee Lease Liabilities Schedule) (Details) - USD ($) $ in Thousands	Dec. 27, 2019	Sep. 28, 2019	Sep. 27, 2019
Operating Lease After Adoption of 842
Remainder of Fiscal 2020	$ 15,386
Fiscal 2021	13,643
Fiscal 2022	11,336
Fiscal 2023	9,375
Fiscal 2024	6,703
Thereafter	29,320
Total undiscounted lease payments	85,763
Less: imputed interest	(12,174)
Total lease liabilities	$ 73,589	$ 64,600
Operating Leases Before Adoption of 842
Remainder of Fiscal 2020			$ 17,231
Fiscal 2021			9,329
Fiscal 2022			7,191
Fiscal 2023			6,218
Fiscal 2024			4,499
Thereafter			12,355
Total undiscounted lease payments			$ 56,823

Leases (Maturities of Lessor Le

Leases (Maturities of Lessor Lease Payments Schedule) (Details) $ in Thousands	Dec. 27, 2019USD ($)
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
Remainder of Fiscal 2020	$ 1,669
Fiscal 2021	2,227
Fiscal 2022	2,227
Fiscal 2023	2,153
Fiscal 2024	1,107
Thereafter	0
Total undiscounted cash flows	9,383
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]
Remainder of Fiscal 2020	4,059
Fiscal 2021	1,595
Fiscal 2022	1,595
Fiscal 2023	1,595
Fiscal 2024	795
Thereafter	790
Total undiscounted cash flows	10,429
Less: present value of lease payments (recognized as lease receivables)	(8,095)
Difference	$ 2,334

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets Goodwill Rollforward (Details) $ in Thousands	3 Months Ended
	Dec. 27, 2019USD ($)
Goodwill [Roll Forward]
Balance at September 27, 2019	$ 334,829
Acquired goodwill	0
Translation adjustments	614
Balance at September 27, 2019	$ 335,443

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018	Sep. 27, 2019
Finite-Lived Intangible Assets [Line Items]
Cost	$ 428,179		$ 425,705
Accumulated Amortization	(252,198)		(244,814)
Total	175,981		180,891
Purchases of intangible assets	$ 2,900	$ 12,100
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	14 years	11 years 7 months 6 days
Amortization of Intangible Assets	$ 7,200	$ 6,600
Acquired Patents And Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	340,519		338,075
Accumulated Amortization	(183,283)		(176,867)
Total	157,236		161,208
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	64,718		64,728
Accumulated Amortization	(46,417)		(45,510)
Total	18,301		19,218
Other Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	22,942		22,902
Accumulated Amortization	(22,498)		(22,437)
Total	$ 444		$ 465

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets Future Amortization Expense (Details) - USD ($) $ in Thousands	Dec. 27, 2019	Sep. 27, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2020	$ 22,346
2018	29,585
2019	27,580
2020	23,898
2021	22,273
Thereafter	50,299
Total	$ 175,981	$ 180,891

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets Intangible Assets, Additions (Details)	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	14 years	11 years 7 months 6 days

Stockholders' Equity And Stoc_3

Stockholders' Equity And Stock-Based Compensation (Narrative) (Details)

Jan. 29, 2020$ / shares

Dec. 15, 2018shares

Dec. 15, 2017shares

Dec. 15, 2016shares

Dec. 15, 2015shares

Dec. 27, 2019USD ($)vote$ / sharesshares

Dec. 28, 2018$ / shares

Oct. 31, 2010

Mar. 28, 2014

Sep. 27, 2019shares

Jul. 31, 2019USD ($)

Jul. 25, 2018USD ($)

Jan. 25, 2017USD ($)

Oct. 31, 2014USD ($)

Feb. 29, 2012USD ($)

Jul. 31, 2011USD ($)

Jul. 31, 2010USD ($)

Nov. 30, 2009USD ($)

Stockholders' Equity And Stock-Based Compensation [Line Items]

Options outstanding to purchase

7,201,000

Year end stock price | $ / shares

$ 68.34

Percentage of vesting per year

50.00%

Common stock, dividends declared (in dollars per share) | $ / shares

$ 0.22

$ 0.19

Remaining authorization to purchase additional shares | $

$ 331,000,000

Authorization Amount | $

2,000,000,000

$ 250,000,000

Subsequent Event [Member]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Common stock, dividends declared (in dollars per share) | $ / shares

$ 0.22

Employee Stock Option [Member]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Stock options expected to vest | $

$ 33,200,000

Employee stock options expected to be recognized over a weighted-average period

2 years 8 months 12 days

Performance-Based Stock Options [Member]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period

7 years

Compensation requisite measurement period

3 years

Performance-Based Stock Options [Member] | Executive Officer [Member]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Shares exercisable (in shares)

1,169,120

Percentage Of Target Award

125.00%

Options outstanding to purchase

745,639

Performance-Based Stock Options [Member] | Executive Officer [Member] | Awarded Fiscal 2018 [Member] [Domain]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Shares exercisable (in shares)

330,000

Percentage Of Target Award

125.00%

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures

264,000

Performance-Based Stock Options [Member] | Executive Officer [Member] | Awarded Fiscal 2016 [Member]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Percentage Of Target Award

125.00%

Options vested and exercisable

334,623

Performance-Based Stock Options [Member] | Executive Officer [Member] | Awarded Fiscal 2017 [Member]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Shares exercisable (in shares)

240,539

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures

276,199

Performance-Based Stock Options [Member] | Executive Officer [Member] | Awarded Fiscal 2019 [Member]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Shares exercisable (in shares)

301,375

Percentage Of Target Award

125.00%

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures

241,100

Performance-Based Restricted Stock Units [Member]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Compensation requisite measurement period

3 years

Performance-Based Restricted Stock Units [Member] | Executive Officer [Member]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Shares exercisable (in shares)

124,000

Percentage Of Target Award

200.00%

Options outstanding to purchase

62,000

Restricted Stock Units (RSUs) [Member]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Stock options expected to vest | $

$ 156,800,000

Employee stock options expected to be recognized over a weighted-average period

3 years

Restricted Stock Units (RSUs) [Member] | Employees and Officers [Member]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period

4 years

Restricted Stock Units (RSUs) [Member] | Awards Granted Prior to November 2010 [Member] | Directors [Member]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period

3 years

1 year

Restricted Stock Units (RSUs) [Member] | Awards Granted After November 2010 [Member] | Directors [Member]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period

2 years

Awards Granted Under 2005 Stock Plan Prior To February 2011 [Member]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Terms for issuance of stock

2

Awards Granted Under 2005 Stock Plan From February 2011 [Member]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Terms for issuance of stock

1.6

Employee Stock Purchase Plan [Member]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Percentage of compensation withheld by employees to purchase common stock

10.00%

Common stock purchase price determined over percentage of closing price

15.00%

Additional Stock Approved [Member]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Authorization Amount | $

$ 350,000,000

$ 350,000,000

$ 200,000,000

$ 200,000,000

$ 100,000,000

$ 250,000,000

$ 300,000,000

Class A Common Stock [Member]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Common stock, shares authorized (shares)

500,000,000

500,000,000

Common stock, shares issued (shares)

64,649,011

63,911,270

Common stock, number of votes per share | vote

1

Common stock, shares outstanding (shares)

64,649,011

63,911,270

Class A Common Stock [Member] | 2005 Stock Plan. [Member]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Shares authorized under plan

46,000,000

Options outstanding to purchase

7,795,000

Weighted average remaining contractual life

6 years 7 months 6 days

Options vested and exercisable

4,633,000

Class A Common Stock [Member] | Employee Stock Purchase Plan [Member]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Maximum value of common stock available for eligible employees | $

$ 25,000

Maximum number of common stock available for eligible employees

1,000

Purchase period

6 months

Look back commencement period

1 year

Class B Common Stock [Member]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Common stock, shares authorized (shares)

500,000,000

500,000,000

Common stock, shares issued (shares)

36,229,820

36,229,820

Common stock, number of votes per share | vote

10

Common stock, shares outstanding (shares)

36,229,820

36,229,820

Options Granted Prior To June 2008 [Member] | Employee Stock Option [Member]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period

4 years

Options expiration period

10 years

Options Granted From June Two Thousand Eight Member | Employee Stock Option [Member]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period

4 years

Options expiration period

10 years

Options Granted From June Two Thousand Eight Member | Employee Stock Option [Member] | One year anniversary date

Stockholders' Equity And Stock-Based Compensation [Line Items]

Percentage of stock option becoming exercisable subjected to date of grant

25.00%

Options Granted From June Two Thousand Eight Member | Employee Stock Option [Member] | Over 36 equally installment periods following one year anniversary date

Stockholders' Equity And Stock-Based Compensation [Line Items]

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period

36 months

Minimum [Member] | Performance-Based Stock Options [Member]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Percentage Of Target Award

0.00%

Minimum [Member] | Performance-Based Restricted Stock Units [Member]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Percentage Of Target Award

0.00%

Maximum [Member] | Performance-Based Stock Options [Member]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Percentage Of Target Award

125.00%

Maximum [Member] | Performance-Based Restricted Stock Units [Member]

Stockholders' Equity And Stock-Based Compensation [Line Items]

Percentage Of Target Award

200.00%

Stockholders' Equity And Stoc_4

Stockholders' Equity And Stock-Based Compensation (Summary Of Stock Options Issued To Officers, Directors, And Employees Under 2000 Stock Incentive Plan And 2005 Stock Plan) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 27, 2019USD ($)$ / sharesshares
Shares
Shares, Options outstanding at beginning of period | shares	7,201
Shares, Grants | shares	1,058
Shares, Exercises | shares	(441)
Shares, Forfeitures and cancellations | shares	(23)
Shares, Options vested and expected to vest | shares	7,369
Weighted-Average Exercise Price
Weighted Average Exercise Price, Options outstanding at beginning of period	$ 48.03
Weighted Average Exercise Price, Grants (in usd per share)	68.41
Weighted Average Exercise Price, Exercises (in usd per share)	38.92
Weighted Average Exercise Price, Forfeitures and cancellations (in usd per share)	60.18
Weighted Average Exercise Price, Options outstanding at end of period	51.28
Weighted Average Exercise Price, Options vested and expected to vest (in usd per share)	50.45
Weighted Average Exercise Price, Options exercisable (in usd per share)	$ 43.13
Weighted Average Remaining Contractual Life, Options vested and expected to vest at end of period	6 years 5 months 23 days
Weighted Average Remaining Contractual Life, Options exercisable	5 years 5 months 4 days
Aggregate Intrinsic Value, Options outstanding | $	$ 132,844
Aggregate Intrinsic Value, Options vested and expected to vest | $	131,897
Aggregate Intrinsic Value, Options exercisable | $	$ 116,784
Employee Stock Option [Member] | Options Granted From June Two Thousand Eight Member
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years

Stockholders' Equity And Stoc_5

Stockholders' Equity And Stock-Based Compensation (Summary Of Restricted Stock Units Issued To Officers, Directors, And Employees Under 2005 Stock Incentive Plan) (Details) shares in Thousands	3 Months Ended
	Dec. 27, 2019$ / sharesshares
Shares
Shares, Non-vested at beginning of period | shares	2,805
Shares, Granted | shares	1,214
Shares, Vested | shares	(897)
Shares, Forfeitures | shares	(43)
Shares, Non-vested at end of period | shares	3,079
Weighted-Average Grant Date Fair Value
Weighted Average Fair Value, Non-vested at beginning of period | $ / shares	$ 58.84
Weighted Average Fair Value, Granted | $ / shares	66.28
Weighted Average Fair Value, Vested | $ / shares	51.77
Weighted Average Fair Value, Forfeitures | $ / shares	59.23
Weighted Average Fair Value, Non-vested at end of period | $ / shares	$ 62.39

Stockholders' Equity And Stoc_6

Stockholders' Equity And Stock-Based Compensation (Schedule Of Fair Value Of Stock-Based Awards Estimated Using Weighted-Average Assumptions) (Details)	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Stockholders' Equity And Stock-Based Compensation [Abstract]
Expected life (in years)	4 years 10 months 28 days	4 years 10 months 24 days
Risk-free interest rate	1.70%	2.70%
Expected stock price volatility	23.90%	22.90%
Dividend yield	1.30%	1.10%

Stockholders' Equity And Stoc_7

Stockholders' Equity And Stock-Based Compensation (Schedule Of Stock-Based Compensation Expense By Plan) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Stockholders' Equity And Stock-Based Compensation [Line Items]
Stock-based compensation expense	$ 22,614	$ 21,482
Share-based Compensation	22,614	21,482
Benefit from income taxes	(3,594)	(3,760)
Total stock-based compensation, net of tax	19,020	17,722
Stock Option [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Stock-based compensation expense	4,546	5,022
Restricted Stock Units (RSUs) [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Stock-based compensation expense	16,967	15,375
Employee Stock Purchase Plan [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Stock-based compensation expense	1,101	1,085
Cost of Sales [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Stock-based compensation expense	543	488
Research and Development Expense [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Stock-based compensation expense	6,987	6,241
Selling and Marketing Expense [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Stock-based compensation expense	8,174	8,217
General and Administrative Expense [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Stock-based compensation expense	$ 6,910	$ 6,536

Stockholders' Equity And Stoc_8

Stockholders' Equity And Stock-Based Compensation (Schedule of Stock-Based Compensation By Classification) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 22,614	$ 21,482
Benefit from income taxes	(3,594)	(3,760)
Total stock-based compensation, net of tax	19,020	17,722
Cost of products [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	543	488
Research and development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	6,987	6,241
Sales and marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	8,174	8,217
General and administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 6,910	$ 6,536

Stockholders' Equity And Stoc_9

Stockholders' Equity And Stock-Based Compensation (Tax Benefit from Exercise of Options) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	$ 202	$ 142

Stockholders' Equity And Sto_10

Stockholders' Equity And Stock-Based Compensation (Stock Repurchase Authorizations) (Details) - USD ($) $ in Thousands	Dec. 27, 2019	Jul. 31, 2019	Jul. 25, 2018	Jan. 25, 2017	Oct. 31, 2014	Feb. 29, 2012	Jul. 31, 2011	Jul. 31, 2010	Nov. 30, 2009
Equity, Class of Treasury Stock [Line Items]
Authorization Amount	$ 2,000,000								$ 250,000
Additional Stock Approved [Member]
Equity, Class of Treasury Stock [Line Items]
Authorization Amount		$ 350,000	$ 350,000	$ 200,000	$ 200,000	$ 100,000	$ 250,000	$ 300,000

Stockholders' Equity And Sto_11

Stockholders' Equity And Stock-Based Compensation (Stock Repurchase) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares repurchased (in shares)	432,042
Payments for Repurchase of Common Stock	$ 30,003	$ 112,545
Repurchase of common stock	$ 30,003
Stock Repurchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares repurchased (in shares)	432,042
Average Price Paid per Share (in dollars per share)	$ 69.44

Stockholders' Equity and Sto_12

Stockholders' Equity and Stock-Based Compensation - Dividends (Details) - USD ($) $ / shares in Units, $ in Millions	Feb. 20, 2020	Jan. 29, 2020	Dec. 27, 2019	Dec. 28, 2018
Dividends Payable [Line Items]
Common stock, dividends declared (in dollars per share)			$ 0.22	$ 0.19
Subsequent Event [Member]
Dividends Payable [Line Items]
Common stock, dividends declared (in dollars per share)		$ 0.22
Dividend Payment	$ 22.2

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, Beginning Of Period	$ (20,625)	$ (15,832)
Unrealized Gains (Losses)	(1,894)
Income Tax Effect - Benefit/(Expense)	3	0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	1,512	(2,646)
Realized (Gains) - Investment Securities	1,314	(201)
Income Tax Effect - (Benefit)/Expense	(261)	40
Net Of Tax	1,053	(161)
Net current-period other comprehensive income/(loss)	2,565	(2,807)
Balance, End Of Period	(18,060)	(18,639)
Unrealized Gains/Losses On Available-For-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, Beginning Of Period	2,198	(2,948)
Unrealized Gains (Losses)	(2,209)	931
Income Tax Effect - Benefit/(Expense)	0	0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(2,209)	931
Realized (Gains) - Investment Securities	1,308	(201)
Income Tax Effect - (Benefit)/Expense	(261)	40
Net Of Tax	1,047	(161)
Net current-period other comprehensive income/(loss)	(1,162)	770
Balance, End Of Period	1,036	(2,178)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, Beginning Of Period	0
Unrealized Gains (Losses)	315
Income Tax Effect - Benefit/(Expense)	(37)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	278
Realized (Gains) - Investment Securities	6
Net Of Tax	6
Net current-period other comprehensive income/(loss)	284
Balance, End Of Period	284
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, Beginning Of Period	(22,823)	(12,884)
Unrealized Gains (Losses)	3,403	(3,577)
Income Tax Effect - Benefit/(Expense)	40	0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	3,443	(3,577)
Net current-period other comprehensive income/(loss)	3,443	(3,577)
Balance, End Of Period	$ (19,380)	$ (16,461)

Per Share Data (Details)

Per Share Data (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net income attributable to Dolby Laboratories, Inc.	$ 48,753	$ 98,219
Weighted average shares outstanding-basic (in shares)	100,336	102,677
Potential common shares from options to purchase common stock (in shares)	1,711	2,251
Potential common shares from restricted stock units (in shares)	1,020	1,202
Potential common shares from ESPP (in shares)	11	0
Weighted average shares outstanding-diluted (in shares)	103,078	106,130
Net income per share attributable to Dolby Laboratories, Inc. - Basic (in usd per share)	$ 0.49	$ 0.96
Net income per share attributable to Dolby Laboratories, Inc. - Diluted (in usd per share)	$ 0.47	$ 0.93
Employee Stock Option [Member]
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Anti-dilutive securities, excluded from calculations (in shares)	2,623	1,583
Restricted Stock Units (RSUs) [Member]
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Anti-dilutive securities, excluded from calculations (in shares)	8	10
Employee Stock Purchase Plan [Member]
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Anti-dilutive securities, excluded from calculations (in shares)	3	0

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018	Sep. 27, 2019
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, gross	$ 110,200		$ 108,500
Unrecognized tax benefits if recognized, would affect our effective tax rate	$ 74,500		$ 72,800
Effective tax rate (as a percent)	10.80%	(32.50%)
Provision (benefit) for income taxes	$ 5,863	$ (24,104)
Federal tax rate	21.00%

Restructuring (Details)

Restructuring (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 27, 2019	Dec. 28, 2018	Sep. 27, 2019
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	$ 15,851	$ 124	$ 124
Restructuring charges	(675)	(14)	(36,558)
Cash payments	(8,574)		(7,713)
Non-cash and other adjustments	182		(13,118)
Restructuring reserve, ending balance	8,134		15,851
Severance
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	128	0	0
Restructuring charges	0		(3,134)
Cash payments	(72)		(3,006)
Non-cash and other adjustments	158		0
Restructuring reserve, ending balance	214		128
Leased facility exit costs
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	15,723	0	0
Restructuring charges	(675)		(18,261)
Cash payments	(8,502)		(4,577)
Non-cash and other adjustments	24		2,039
Restructuring reserve, ending balance	7,920		15,723
Fixed assets write-off
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0	0	0
Restructuring charges	0		(15,216)
Cash payments	0		0
Non-cash and other adjustments	0		(15,216)
Restructuring reserve, ending balance	0		0
Other associated costs
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0	$ 124	124
Restructuring charges	0		53
Cash payments	0		(130)
Non-cash and other adjustments	0		59
Restructuring reserve, ending balance	$ 0		$ 0

Commitments And Contingencies_2

Commitments And Contingencies (Schedule Of Contractual Obligations And Commitments) (Details) - USD ($) $ in Thousands	Dec. 27, 2019	Sep. 27, 2019
Commitments and Contingencies Disclosure [Abstract]
Remainder of Fiscal 2018	$ 3,954
Naming rights, Fiscal 2019	8,008
Naming rights, Fiscal 2020	8,108
Naming rights, Fiscal 2021	8,209
Naming rights, Fiscal 2022	8,312
Naming rights, Thereafter	70,344
Naming rights, Total	106,935
Donation commitments, Remainder of Fiscal 2018	4,077
Donation commitments, Fiscal 2019	141
Donation commitments, Fiscal 2020	141
Donation commitments, Fiscal 2021	141
Donation commitments, Fiscal 2022	141
Donation commitments, Thereafter	1,059
Donation commitments, Total	5,700
Fiscal 2021		$ 9,329
Fiscal 2022		7,191
Fiscal 2023		6,218
Fiscal 2024		4,499
Thereafter		$ 12,355
Purchase obligation, Remainder of 2018	23,161
Purchase obligation, Fiscal 2019	4,615
Purchase obligation, Fiscal 2020	2,176
Purchase Obligation, Fiscal 2021	0
Purchase obligation, Fiscal 2022	0
Purchase obligation, Thereafter	0
Purchase obligation, Total	29,952
Total, due in Remainder of Fiscal 2018	31,192
Total, due in Fiscal 2019	12,764
Total, due in Fiscal 2020	10,425
Total, due in Fiscal 2021	8,350
Total, due in Fiscal 2022	8,453
Total, due Thereafter	71,403
Total due	$ 142,587

Commitments And Contingencies_3

Commitments And Contingencies (Narrative) (Details)	3 Months Ended
	Dec. 27, 2019
Naming Rights [Member]
Other Commitments [Line Items]
Term of agreement	20 years
Donation Commitments [Member]
Other Commitments [Line Items]
Term of agreement	15 years

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ in Thousands	Dec. 27, 2019	Nov. 30, 2009
Subsequent Event [Line Items]
Stock repurchase program, authorized amount	$ 2,000,000	$ 250,000