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Composition Of Certain Financial Statement Captions (Narrative) (Details) - USD ($) $ in Thousands | Sep. 26, 2025 | Sep. 27, 2024 | Aug. 19, 2024
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Composition Of Certain Financial Statement Captions [Line Items] |  |  |
Unbilled accounts receivable | $ 173,500 | $ 173,800 |
Raw materials | 4,254 | 3,079 |
GE Licensing |  |  |
Composition Of Certain Financial Statement Captions [Line Items] |  |  |
Assets acquired |  | 24,500 | $ 18,200
Disposal Group, Disposed of by Sale, Not Discontinued Operations | GE Licensing |  |  |
Composition Of Certain Financial Statement Captions [Line Items] |  |  |
Assets acquired | 15,800 |  |
Other Noncurrent Assets |  |  |
Composition Of Certain Financial Statement Captions [Line Items] |  |  |
Raw materials | 7,500 | $ 10,400 |
Short-term and Long-term Investments | GE Licensing |  |  |
Composition Of Certain Financial Statement Captions [Line Items] |  |  |
Assets acquired | $ 8,700 |  |

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- Definition Amount of asset acquired in business combination and recognized at acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 805 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 805 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-1 + Details
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- Definition Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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