Commitments And Contingencies (Schedule Of Contractual Obligations And Commitments) (Details) $ in Thousands	Jun. 30, 2023 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Remainder of Fiscal 2022	$ 4,358
Naming rights, Fiscal 2023	12,794
Naming rights, Fiscal 2024	13,126
Naming rights, Fiscal 2025	13,472
Naming rights, Fiscal 2026	8,534
Naming rights, Thereafter	44,316
Naming rights, Total	96,600
Purchase obligation, Remainder of 2022	12,584
Purchase obligation, Fiscal 2023	13,328
Purchase obligation, Fiscal 2024	4,827
Purchase Obligation, Fiscal 2025	490
Purchase obligation, Fiscal 2026	0
Purchase obligation, Thereafter	0
Purchase obligation, Total	31,229
Donation commitments, Remainder of Fiscal 2022	1,681
Donation commitments, Fiscal 2023	116
Donation commitments, Fiscal 2024	116
Donation commitments, Fiscal 2025	116
Donation commitments, Fiscal 2026	86
Donation commitments, Thereafter	417
Donation commitments, Total	2,532
Total, due in Remainder of Fiscal 2022	18,623
Total, due in Fiscal 2023	26,238
Total, due in Fiscal 2024	18,069
Total, due in Fiscal 2025	14,078
Total, due in Fiscal 2026	8,620
Total, due Thereafter	44,733
Total due	$ 130,361

Total operating leases and purchase obligations due.

No definition available.

Name:	dlb_TotalOperatingLeasesAndPurchaseObligationsDue
Namespace Prefix:	dlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Total operating leases and purchase obligations due in five years.

+ References

No definition available.

+ Details

Name:	dlb_TotalOperatingLeasesAndPurchaseObligationsDueInFiveYears
Namespace Prefix:	dlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Total operating leases and purchase obligations due in four years.

+ References

No definition available.

+ Details

Name:	dlb_TotalOperatingLeasesAndPurchaseObligationsDueInFourYears
Namespace Prefix:	dlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Total operating leases and purchase obligations due in three years.

+ References

No definition available.

+ Details

Name:	dlb_TotalOperatingLeasesAndPurchaseObligationsDueInThreeYears
Namespace Prefix:	dlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Total operating leases and purchase obligations due in two years.

+ References

No definition available.

+ Details

Name:	dlb_TotalOperatingLeasesAndPurchaseObligationsDueInTwoYears
Namespace Prefix:	dlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Total operating leases and purchase obligations due thereafter.

+ References

No definition available.

+ Details

Name:	dlb_TotalOperatingLeasesAndPurchaseObligationsDueThereafter
Namespace Prefix:	dlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Total operating leases and purchase obligations due within one year.

+ References

No definition available.

+ Details

Name:	dlb_TotalOperatingLeasesAndPurchaseObligationsDueWithinOneYear
Namespace Prefix:	dlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Unrecorded Unconditional Donation Obligation

+ References

No definition available.

+ Details

Name:	dlb_UnrecordedUnconditionalDonationObligation
Namespace Prefix:	dlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Unrecorded Unconditional Donation Obligation, Due after Five Years

+ References

No definition available.

+ Details

Name:	dlb_UnrecordedUnconditionalDonationObligationDueafterFiveYears
Namespace Prefix:	dlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Unrecorded Unconditional Donation Obligation, Due in Next Twelve Months

+ References

No definition available.

+ Details

Name:	dlb_UnrecordedUnconditionalDonationObligationDueinNextTwelveMonths
Namespace Prefix:	dlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Unrecorded Unconditional Donation Obligation, Due within Five Years

+ References

No definition available.

+ Details

Name:	dlb_UnrecordedUnconditionalDonationObligationDuewithinFiveYears
Namespace Prefix:	dlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Unrecorded Unconditional Donation Obligation, Due within Four Years

+ References

No definition available.

+ Details

Name:	dlb_UnrecordedUnconditionalDonationObligationDuewithinFourYears
Namespace Prefix:	dlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Unrecorded Unconditional Donation Obligation, Due within Three Years

+ References

No definition available.

+ Details

Name:	dlb_UnrecordedUnconditionalDonationObligationDuewithinThreeYears
Namespace Prefix:	dlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Unrecorded Unconditional Donation Obligation, Due within Two Years

+ References

No definition available.

+ Details

Name:	dlb_UnrecordedUnconditionalDonationObligationDuewithinTwoYears
Namespace Prefix:	dlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Unrecorded Unconditional Obligation, Balance on Fifth Anniversary

+ References

No definition available.

+ Details

Name:	dlb_UnrecordedUnconditionalObligationBalanceOnFifthAnniversary
Namespace Prefix:	dlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Unrecorded Unconditional Obligation, Balance on Fourth Anniversary

+ References

No definition available.

+ Details

Name:	dlb_UnrecordedUnconditionalObligationBalanceOnFourthAnniversary
Namespace Prefix:	dlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Unrecorded Unconditional Obligation, Balance on Second Anniversary

+ References

No definition available.

+ Details

Name:	dlb_UnrecordedUnconditionalObligationBalanceOnSecondAnniversary
Namespace Prefix:	dlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Unrecorded Unconditional Obligation, Balance on Third Anniversary

+ References

No definition available.

+ Details

Name:	dlb_UnrecordedUnconditionalObligationBalanceOnThirdAnniversary
Namespace Prefix:	dlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Unrecorded Unconditional Obligation, Balance Sheet Amount

+ References

No definition available.

+ Details

Name:	dlb_UnrecordedUnconditionalObligationBalanceSheetAmount
Namespace Prefix:	dlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Unrecorded Unconditional Obligation Balance on First Anniversary

+ References

No definition available.

+ Details

Name:	dlb_UnrecordedUnconditionalObligationBalanceonFirstAnniversary
Namespace Prefix:	dlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Unrecorded Unconditional Obligation, Due After Five Years

+ References

No definition available.

+ Details

Name:	dlb_UnrecordedUnconditionalObligationDueAfterFiveYears
Namespace Prefix:	dlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 440
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482648/440-10-50-4

+ Details

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

+ References

+ Details

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 440
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482648/440-10-50-4

+ Details

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant