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Goodwill and Intangible Assets Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 28, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Cost |  | $ 532,254 |  | $ 444,737
Accumulated Amortization |  | (354,920) |  | (332,472)
Net |  | 177,334 |  | 112,265
Purchases of intangible assets |  |  | $ 11,500 |
Weighted-Average Useful Life (Years) |  |  | 16 years |
MPEG LA, L.L.C. |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Weighted-Average Useful Life (Years) | 12 years |  |  |
Identifiable intangible assets acquired |  | 86,000 |  |
Acquired patents and technology |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Cost |  | 357,032 |  | 355,622
Accumulated Amortization |  | (271,322) |  | (253,080)
Net |  | 85,710 |  | 102,542
Customer relationships |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Cost |  | 152,190 |  | 66,142
Accumulated Amortization |  | (60,617) |  | (56,572)
Net |  | 91,573 |  | 9,570
Other intangible assets |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Cost |  | 23,032 |  | 22,973
Accumulated Amortization |  | (22,981) |  | (22,820)
Net |  | $ 51 |  | $ 153

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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