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v3.25.2

Description of Business, Basis of Presentation and Significant Accounting Policies - Goodwill and Indefinite-Lived Intangible Assets (Details) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2025 USD ($) | Dec. 08, 2016 USD ($)
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill impairment loss |  |  |  |  | $ 1,261,700,000 |  |
Goodwill |  |  |  | $ 0 | 494,000,000.0 | $ 0 |
Indefinite-lived intangible assets (excluding goodwill) |  |  |  | 0 |  | $ 0 |
Impairment of intangible assets, indefinite-lived (excluding goodwill) | $ 170,000,000.0 |  |  |  |  |  |
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration] | Goodwill and intangible assets impairment |  |  |  |  |  |
Lionsgate Capital Holdings, LLC |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill impairment loss |  |  |  |  | 213,300,000 |  |
Goodwill |  |  |  |  | 0 |  |
Measurement Input, Long-Term Revenue Growth Rate |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill, measurement input |  | 0.015 |  |  |  |  |
Measurement Input, Discount Rate |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill, measurement input |  | 0.105 |  |  |  |  |
Starz Business |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill impairment loss |  |  |  |  | $ 1,475,000,000 |  |
Trade Names |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Indefinite-lived intangible assets (excluding goodwill) |  | $ 80,000,000.0 |  |  |  |  | $ 250,000,000.0
Finite-lived intangible asset, useful life |  | 10 years |  |  |  |  |
Starz Networks [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill impairment loss |  |  |  | $ 494,000,000.0 |  |  |
Minimum |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  | 10 years |
Minimum | Measurement Input, Long-Term Revenue Growth Rate |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill, measurement input |  |  | 0.020 |  |  |  |
Minimum | Measurement Input, Discount Rate |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill, measurement input |  |  | 0.100 |  |  |  |
Maximum |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  | 14 years |
Maximum | Measurement Input, Long-Term Revenue Growth Rate |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill, measurement input |  |  | 0.030 |  |  |  |
Maximum | Measurement Input, Discount Rate |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill, measurement input |  |  | 0.140 |  |  |  |

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