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Per Share Data (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 01, 2016 | Mar. 27, 2015 | Apr. 01, 2016 | Mar. 27, 2015
Schedule Of Earnings Per Share Basic And Diluted [Line Items] |  |  |  |
Document Period End Date |  |  | Apr. 01, 2016 |
Net income attributable to Dolby Laboratories, Inc. | $ 67,398 | $ 57,974 | $ 98,299 | $ 99,331
Weighted average shares outstanding-basic | 100,456 | 102,509 | 100,600 | 102,406
Potential common shares from options to purchase common stock | 748 | 889 | 674 | 941
Potential common shares from restricted stock units | 351 | 506 | 442 | 750
Weighted average shares outstanding-diluted | 101,555 | 103,904 | 101,716 | 104,097
Net income per share attributable to Dolby Laboratories, Inc. - Basic (in usd per share) | $ 0.67 | $ 0.57 | $ 0.98 | $ 0.97
Net income per share attributable to Dolby Laboratories, Inc. - Diluted (in usd per share) | $ 0.66 | $ 0.56 | $ 0.97 | $ 0.95
Stock Options [Member] |  |  |  |
Schedule Of Earnings Per Share Basic And Diluted [Line Items] |  |  |  |
Anti-dilutive securities, excluded from calculations (in shares) | 7,124 | 4,604 | 6,349 | 3,684
Restricted Stock Units [Member] |  |  |  |
Schedule Of Earnings Per Share Basic And Diluted [Line Items] |  |  |  |
Anti-dilutive securities, excluded from calculations (in shares) | 733 | 934 | 184 | 106

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