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v3.23.1

Commitments And Contingencies (Narrative) (Details) | 6 Months Ended
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Mar. 31, 2023
Naming Rights |
Other Commitments [Line Items] |
Term of agreement | 20 years
Donation Commitments |
Other Commitments [Line Items] |
Term of agreement | 15 years

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- Definition Unrecorded Unconditional Obligation, Term of Agreement + References No definition available. + Details
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Namespace Prefix: | dlb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_OtherCommitmentsAxis=dlb_NamingRightsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=dlb_DonationCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |