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Debt - Summary Of Accounting For The Senior Notes redemption (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Disclosure Of Debt Instrument Redemption And Issuance Transactions [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debt | $ (0.5) | $ 0.0 | $ (1.5) | $ 0.0 | $ (1.3) | $ (1.3) | $ (3.4)
Starz Business of Lions Gate Entertainment Corp |  |  |  |  |  |  |
Disclosure Of Debt Instrument Redemption And Issuance Transactions [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  | $ (4.9) | $ 21.2 | $ 21.2 | $ 58.7 | (24.8)
Senior Notes redemption and issuance | Starz Business of Lions Gate Entertainment Corp |  |  |  |  |  |  |
Disclosure Of Debt Instrument Redemption And Issuance Transactions [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  | 24.8
Recorded as a Reduction of Outstanding Debt Balances & Amortized Over Life of New Issuances |  |  |  |  |  |  | 38.1
Total |  |  |  |  |  |  | 62.9
New Debt Issuance Costs and Call Premiums | Senior Notes redemption and issuance | Starz Business of Lions Gate Entertainment Corp |  |  |  |  |  |  |
Disclosure Of Debt Instrument Redemption And Issuance Transactions [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  | 20.7
Recorded as a Reduction of Outstanding Debt Balances & Amortized Over Life of New Issuances |  |  |  |  |  |  | 25.4
Total |  |  |  |  |  |  | 46.1
Previously Incurred Debt Issuance Costs | Senior Notes redemption and issuance | Starz Business of Lions Gate Entertainment Corp |  |  |  |  |  |  |
Disclosure Of Debt Instrument Redemption And Issuance Transactions [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  | 4.1
Recorded as a Reduction of Outstanding Debt Balances & Amortized Over Life of New Issuances |  |  |  |  |  |  | 12.7
Total |  |  |  |  |  |  | $ 16.8

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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + 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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481303/470-50-40-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481303/470-50-40-4 + Details
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