Goodwill and Intangible Assets - Schedule of Carrying Amount of Goodwill (Details) - USD ($) |
3 Months Ended | 12 Months Ended | |
|---|---|---|---|
Mar. 31, 2026 |
Sep. 30, 2025 |
Dec. 31, 2025 |
|
| Goodwill [Roll Forward] | |||
| Goodwill | $ 471,372,000 | ||
| Accumulated impairment losses | $ 0 | (126,600,000) | |
| Beginning balance | 344,772,000 | ||
| Acquisitions | 0 | ||
| Ending balance | 344,772,000 | 344,772,000 | |
| Sphere | |||
| Goodwill [Roll Forward] | |||
| Goodwill | 46,864,000 | ||
| Accumulated impairment losses | 0 | $ 0 | 0 |
| Beginning balance | 46,864,000 | ||
| Acquisitions | 0 | ||
| Ending balance | 46,864,000 | 46,864,000 | |
| MSG Networks | |||
| Goodwill [Roll Forward] | |||
| Goodwill | 424,508,000 | ||
| Accumulated impairment losses | 0 | $ (65,400,000) | (126,600,000) |
| Beginning balance | 297,908,000 | ||
| Acquisitions | 0 | ||
| Ending balance | $ 297,908,000 | $ 297,908,000 | |
| X | ||||||||||
- Definition Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount, before accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. Includes amount, before amortization expense and impairment loss, of goodwill for private company. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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