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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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