v3.26.1
Investments & Fair Value Measurements - Investment Portfolio (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended
Jun. 26, 2026
Jun. 27, 2025
Mar. 27, 2026
Jun. 26, 2026
Jun. 27, 2025
Sep. 26, 2025
Cash and cash equivalents:            
Cash and cash equivalents $ 669,394     $ 669,394   $ 701,893
Short-term investments:            
Cost 652     652   703
Unrealized Gains 0     0   0
Unrealized Losses 0     0   0
Total 652     652   703
Long-term investments:            
Cost 86,437     86,437   80,205
Unrealized Gains 0     0   0
Unrealized Losses 0     0   0
Total 86,437     86,437   80,205
Total cash, cash equivalents, and investments, Cost 756,483     756,483   782,801
Cash, Cash Equivalents, And Investments, Unrealized Gain 0     0   0
Cash, Cash Equivalents, And Investments, Unrealized Loss 0     0   0
Total cash, cash equivalents, and investments, Total 756,483     756,483   $ 782,801
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration]           Prepaid expenses and other current assets
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration]           Other non-current assets
Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]           Other non-current liabilities
Derivative Asset, Current 484     484   $ 1,442
Derivative Asset, Noncurrent           111
Derivative Liability, Noncurrent           (48)
Equity Method Investments 74,700     74,700   68,500
Net income attributable to Dolby Laboratories, Inc. 28,602 $ 46,071   176,844 $ 205,686  
Equity Method Investment, Nonconsolidated Investee or Group of Investees            
Long-term investments:            
Net income attributable to Dolby Laboratories, Inc. 5,700 $ 3,700   14,100 $ 17,100  
Derivative Financial Instruments, Liabilities            
Long-term investments:            
Derivative Liability (290)     (290)    
Derivative Financial Instruments, Liabilities, Amortized Cost Basis 0     0   0
Derivative Financial Instruments, Unrealized Gain     $ 0 0    
Derivative Financial Instruments, Unrealized Loss     (48) (290)    
Derivative Financial Instruments, Assets, Current            
Long-term investments:            
Derivative Financial Instruments, Assets, Amortized Cost Basis 0     0   0
Derivative Financial Instruments, Unrealized Gain     1,442 484    
Derivative Financial Instruments, Unrealized Loss     0 0    
Derivative Financial Instruments, Assets, Noncurrent            
Long-term investments:            
Derivative Financial Instruments, Assets, Amortized Cost Basis           0
Derivative Financial Instruments, Unrealized Gain     111      
Derivative Financial Instruments, Unrealized Loss     $ 0      
Short-Term Investments            
Short-term investments:            
Cost 652     652   703
Unrealized Gains 0     0   0
Unrealized Losses 0     0   0
Total 652     652   703
Other Long-term Investments            
Long-term investments:            
Cost 86,437     86,437   80,205
Unrealized Gains 0     0   0
Unrealized Losses 0     0   0
Total 86,437     86,437   80,205
Equity Securities without Readily Determinable Fair Value, Amount 11,800     11,800   11,800
Level 1            
Cash and cash equivalents:            
Estimated Fair Value 669,394     669,394   701,893
Short-term investments:            
Estimated Fair Value 652     652   703
Long-term investments:            
Estimated Fair Value 0     0   0
Assets 670,046     670,046   702,596
Derivative Liability 0     0    
Derivative Asset, Current 0     0   0
Derivative Asset, Noncurrent           0
Derivative Liability, Noncurrent           0
Level 1 | Short-Term Investments            
Short-term investments:            
Estimated Fair Value 652     652   703
Level 1 | Other Long-term Investments            
Long-term investments:            
Estimated Fair Value 0     0    
Level 1 | Investments Held In Supplemental Retirement Plan            
Long-term investments:            
Assets 5,685     5,685   5,413
Liabilities 5,685     5,685   5,413
Level 2            
Cash and cash equivalents:            
Estimated Fair Value 0     0   0
Short-term investments:            
Estimated Fair Value 0     0   0
Long-term investments:            
Estimated Fair Value 0     0   0
Assets 0     0   0
Derivative Liability (290)     (290)    
Derivative Asset, Current 484     484   1,442
Derivative Asset, Noncurrent           111
Derivative Liability, Noncurrent           (48)
Level 2 | Short-Term Investments            
Short-term investments:            
Estimated Fair Value 0     0   0
Level 2 | Other Long-term Investments            
Long-term investments:            
Estimated Fair Value 0     0    
Level 2 | Investments Held In Supplemental Retirement Plan            
Long-term investments:            
Assets 0     0    
Liabilities 0     0    
Level 3            
Cash and cash equivalents:            
Estimated Fair Value 0     0   0
Short-term investments:            
Estimated Fair Value 0     0   0
Long-term investments:            
Estimated Fair Value 0     0   0
Assets 0     0   0
Derivative Liability 0     0    
Derivative Asset, Current 0     0   0
Derivative Asset, Noncurrent           0
Derivative Liability, Noncurrent           0
Level 3 | Short-Term Investments            
Short-term investments:            
Estimated Fair Value 0     0   0
Level 3 | Other Long-term Investments            
Long-term investments:            
Estimated Fair Value 0     0   0
Level 3 | Investments Held In Supplemental Retirement Plan            
Long-term investments:            
Assets 0     0    
Liabilities 0     0    
Cash            
Cash and cash equivalents:            
Cash and cash equivalents 667,740     667,740   529,422
Cash | Level 1            
Cash and cash equivalents:            
Estimated Fair Value 667,740     667,740   529,422
Cash | Level 2            
Cash and cash equivalents:            
Estimated Fair Value 0     0    
Cash | Level 3            
Cash and cash equivalents:            
Estimated Fair Value 0     0    
Money market funds            
Cash and cash equivalents:            
Cash and cash equivalents 1,654     1,654   172,471
Money market funds | Level 1            
Cash and cash equivalents:            
Estimated Fair Value 1,654     1,654   $ 172,471
Money market funds | Level 2            
Cash and cash equivalents:            
Estimated Fair Value 0     0    
Money market funds | Level 3            
Cash and cash equivalents:            
Estimated Fair Value $ 0     $ 0