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Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Mar. 31, 2029 | Mar. 31, 2028 | Mar. 31, 2027 | Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  | $ 2.1 | $ 2.2 | $ 2.2 | $ 2.5 | $ 4.2 | $ 5.3 | $ 5.7 | $ 5.7
Goodwill Impairment Carrying Value |  |  |  |  |  |  |  | 811.2 |  |
Starz Business of Lions Gate Entertainment Corp |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  | $ 108.0 | $ 113.3 | $ 118.4 | $ 125.1 | $ 134.2 | 137.0 | 134.5 | $ 129.2
Goodwill impairment |  |  |  |  |  |  |  | 494.0 | $ 1,475.0 |
Starz Business of Lions Gate Entertainment Corp | Starz Networks |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill impairment loss before business combination | $ 250.0 | $ 250.0 |  |  |  |  |  |  |  |
Starz Business of Lions Gate Entertainment Corp | Trade name |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  |  | $ 4.0 |  |
Goodwill impairment | 170.0 | 170.0 |  |  |  |  |  |  |  |
Starz Business of Lions Gate Entertainment Corp | Trade name | Starz Networks |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill Impairment Carrying Value | $ 80.0 | $ 80.0 |  |  |  |  |  |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482686/350-30-45-2 + Details
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