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Restructuring (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 27, 2015
Mar. 28, 2014
Mar. 27, 2015
Mar. 28, 2014
Restructuring Reserve [Roll Forward]        
Restructuring charges $ 0us-gaap_RestructuringCharges $ 86us-gaap_RestructuringCharges $ (39)us-gaap_RestructuringCharges $ 3,301us-gaap_RestructuringCharges
Restructuring Charges [Member]        
Restructuring Reserve [Roll Forward]        
Restructuring charges     3,300us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= us-gaap_RestructuringChargesMember
 
2014 Restructuring Plan [Member]        
Restructuring Cost and Reserve [Line Items]        
Number of positions eliminated     50us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated
/ us-gaap_RestructuringPlanAxis
= dlb_A2014RestructuringPlanMember
 
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning balance     146us-gaap_RestructuringReserve
/ us-gaap_RestructuringPlanAxis
= dlb_A2014RestructuringPlanMember
 
Restructuring charges     (39)us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= dlb_A2014RestructuringPlanMember
 
Cash payments     (10)us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringPlanAxis
= dlb_A2014RestructuringPlanMember
 
Non-cash charges and other adjustments     (97)us-gaap_RestructuringReserveSettledWithoutCash1
/ us-gaap_RestructuringPlanAxis
= dlb_A2014RestructuringPlanMember
 
Restructuring reserve, ending balance $ 0us-gaap_RestructuringReserve
/ us-gaap_RestructuringPlanAxis
= dlb_A2014RestructuringPlanMember
  $ 0us-gaap_RestructuringReserve
/ us-gaap_RestructuringPlanAxis
= dlb_A2014RestructuringPlanMember