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Commitments And Contingencies (Narrative) (Details)	9 Months Ended
	Jun. 30, 2023
Naming Rights
Other Commitments [Line Items]
Term of agreement	20 years
Donation Commitments
Other Commitments [Line Items]
Term of agreement	15 years

X

- Definition

Unrecorded Unconditional Obligation, Term of Agreement

+ References

No definition available.

+ Details

Name:	dlb_UnrecordedUnconditionalObligationTermOfAgreement
Namespace Prefix:	dlb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- 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: