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Per Share Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 27, 2015 | Dec. 26, 2014 | Mar. 28, 2014 | Dec. 27, 2013 | Mar. 27, 2015 | Mar. 28, 2014
Schedule Of Earnings Per Share Basic And Diluted [Line Items] |  |  |  |  |  |
Net income attributable to Dolby Laboratories, Inc. |  | $ 57,974 us-gaap_NetIncomeLoss |  | $ 75,868 us-gaap_NetIncomeLoss | $ 99,331 us-gaap_NetIncomeLoss | $ 120,383 us-gaap_NetIncomeLoss
Weighted average shares outstanding-basic |  | 102,509 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 102,291 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 102,406 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 102,021 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Potential common shares from options to purchase common stock |  | 889 dlb_IncrementalCommonSharesAttributableToStockOptions |  | 637 dlb_IncrementalCommonSharesAttributableToStockOptions | 941 dlb_IncrementalCommonSharesAttributableToStockOptions | 445 dlb_IncrementalCommonSharesAttributableToStockOptions
Potential common shares from restricted stock units |  | 506 dlb_IncrementalCommonSharesAttributableToRestrictedStockUnits |  | 1,006 dlb_IncrementalCommonSharesAttributableToRestrictedStockUnits | 750 dlb_IncrementalCommonSharesAttributableToRestrictedStockUnits | 994 dlb_IncrementalCommonSharesAttributableToRestrictedStockUnits
Weighted average shares outstanding-diluted | 103,904 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 103,904 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 103,934 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 103,934 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 104,097 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 103,460 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income per share attributable to Dolby Laboratories, Inc. - Basic (in usd per share) |  | $ 0.57 us-gaap_EarningsPerShareBasic |  | $ 0.74 us-gaap_EarningsPerShareBasic | $ 0.97 us-gaap_EarningsPerShareBasic | $ 1.18 us-gaap_EarningsPerShareBasic
Net income per share attributable to Dolby Laboratories, Inc. - Diluted (in usd per share) |  | $ 0.56 us-gaap_EarningsPerShareDiluted |  | $ 0.73 us-gaap_EarningsPerShareDiluted | $ 0.95 us-gaap_EarningsPerShareDiluted | $ 1.16 us-gaap_EarningsPerShareDiluted
Stock Options [Member] |  |  |  |  |  |
Schedule Of Earnings Per Share Basic And Diluted [Line Items] |  |  |  |  |  |
Anti-dilutive securities, excluded from calculations (in shares) |  | 4,604 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember |  | 3,597 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember | 3,684 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember | 4,075 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember
Restricted Stock Units [Member] |  |  |  |  |  |
Schedule Of Earnings Per Share Basic And Diluted [Line Items] |  |  |  |  |  |
Anti-dilutive securities, excluded from calculations (in shares) |  | 934 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_PlanNameAxis = us-gaap_RestrictedStockUnitsRSUMember |  | 290 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_PlanNameAxis = us-gaap_RestrictedStockUnitsRSUMember | 106 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_PlanNameAxis = us-gaap_RestrictedStockUnitsRSUMember | 1,170 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_PlanNameAxis = us-gaap_RestrictedStockUnitsRSUMember

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