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Document And Entity Information
 6 Months Ended
Mar. 27, 2015
Apr. 24, 2015
Entity Registrant Name Dolby Laboratories, Inc.  
Entity Central Index Key 0001308547  
Current Fiscal Year End Date --09-25  
Entity Filer Category Large Accelerated Filer  
Document Type 10-Q  
Document Period End Date Mar. 27, 2015  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Class A Common Stock [Member]    
Entity Common Stock, Shares Outstanding   51,647,278dei_EntityCommonStockSharesOutstanding
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Class B Common Stock [Member]    
Entity Common Stock, Shares Outstanding   51,068,661dei_EntityCommonStockSharesOutstanding
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