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Business Combination (Additional Information) (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 19, 2024 | Apr. 28, 2023 | Jan. 31, 2022 | Sep. 26, 2025 | Sep. 27, 2024 | Sep. 29, 2023
Business Combination [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | $ 529,900 | $ 533,208 | $ 408,409
Total purchase consideration |  |  |  | $ 1,362 | 487,877 | $ (25,703)
Weighted-average useful life |  |  |  | 14 years |  |
Payments to acquire intangible assets |  |  |  | $ 5,600 |  |
MPEG LA, L.L.C. |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Percentage acquired |  | 100.00% |  |  |  |
Non-controlling interest in Via LA |  | $ 24,815 |  |  |  |
Cash held in escrow |  | 3,600 |  |  |  |
Goodwill |  | 40,579 |  | (20,300) |  |
Amounts payable to patent administrative program partners |  | (179,616) |  | (20,300) |  |
Acquisition related costs |  |  |  | 3,800 |  |
Intangible assets |  | $ 86,000 |  |  |  |
Weighted-average useful life |  | 12 years |  |  |  |
GE Licensing |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Percentage acquired | 100.00% |  |  |  |  |
Non-controlling interest in Via LA | $ 9,921 |  |  |  |  |
Goodwill | 75,387 |  |  |  |  |
Acquisition related costs |  |  |  | 6,400 |  |
Intangible assets | $ 274,197 |  |  |  |  |
Weighted-average useful life | 11 years |  |  |  |  |
Assets acquired | $ 18,200 |  |  |  | 24,500 |
Contingent liabilities | 14,199 |  |  |  |  |
Payments to acquire intangible assets |  |  |  |  | 274,200 |
GE Licensing | Disposal Group, Held-for-Sale, Not Discontinued Operations |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Assets acquired | $ 6,300 |  |  |  |  |
GE Licensing | Total Dolby Laboratories,Inc.[Member] |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Purchase of non-controlling interest in business combinations |  |  |  |  | 5,300 |
GE Licensing | Controlling Interest [Member] |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Purchase of non-controlling interest in business combinations |  |  |  |  | 4,600 |
GE Licensing | General and Administrative Expense [Member] |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Acquisition related costs |  |  |  | 4,300 |  |
GE Licensing | Selling and Marketing Expense [Member] |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Acquisition related costs |  |  |  | $ 2,100 |  |
THEO Technologies |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Goodwill |  |  | $ 39,900 |  |  |
Total purchase consideration |  |  | $ 58,700 |  |  |
Payments to acquire intangible assets |  |  |  |  | $ 24,600 |
THEO Technologies | Minimum [Member] |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Weighted-average useful life |  |  | 3 years |  |  |
THEO Technologies | Maximum [Member] |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Weighted-average useful life |  |  | 13 years |  |  |

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