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Description of Business, Basis of Presentation and Significant Accounting Policies - Narrative (Details) - USD ($) shares in Millions, $ in Millions |  |  | 3 Months Ended | 5 Months Ended | 6 Months Ended | 12 Months Ended |  |
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May 13, 2024 | May 09, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | 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 | Apr. 15, 2029 | May 08, 2024
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 15, 2029 |  |  |  |
Restricted cash |  |  |  |  |  |  |  |  |  |  |  |  | $ 57.4 | $ 40.5 |  |  |
Interest costs capitalized |  |  |  |  |  |  |  |  |  |  |  |  | $ 21.0 | 28.1 | $ 12.8 |  |
Finite lived intangible assets useful lives |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |
Advertising Expense |  |  |  |  |  |  |  |  |  |  |  |  | $ 347.8 | 203.4 | 201.6 |  |
Finite Lived Intangible Assets Gross |  |  |  |  |  |  |  |  |  |  |  |  | 25.7 | 26.9 |  |  |
Goodwill Impairment Carrying Value |  |  |  |  |  |  |  |  |  |  |  |  | 811.2 |  |  |  |
Amortization of Intangible Assets |  |  |  |  |  |  |  | $ 2.1 | $ 2.2 | $ 2.2 | $ 2.5 | $ 4.2 | $ 5.3 | $ 5.7 | $ 5.7 |  |
Long-Term Debt, Average Amount Outstanding |  |  |  |  |  | $ 715.0 |  |  |  |  |  |  |  |  |  |  |
Proceeds from reverse recapitalization transaction |  |  |  |  | $ 330.0 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from the PIPE investment | $ 254.3 |  |  |  | 254.3 | 254.3 |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  | 299.0 |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares issuable |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |  |
Related Party | General and Administrative Expenses Allocated to Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts of transaction |  | $ 10.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Screaming Eagle | Studio Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners | 12.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Starz Business | General and administration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Costs and expenses related party |  |  |  |  |  | 10.0 |  |  |  |  |  |  |  |  |  |  |
5.5% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes |  |  | $ 325.1 |  | $ 325.1 | 325.1 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | 5.5% Senior Notes Exchange |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt fixed interest rate percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.50% | 5.50%
Long term debt maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 15, 2029 |
Debt interest face value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 389.9
Subsequent Event | 5.5% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest face value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 389.9
Equity Method Investments Investee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest entity, qualitative or quantitative information, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |
Finite lived intangible assets useful lives |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |
Minimum | Equity Method Investments Investee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets useful lives |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |
Maximum | Equity Method Investments Investee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |
Lionsgate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  |  |  |  |  |  | 5.50% |  |  |  |
Business acquisition, equity interest issued or issuable, number of shares |  |  |  |  |  |  |  |  |  |  |  |  | 253.4 |  |  |  |
Starz Business of Lions Gate Entertainment Corp |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advertising Expense |  |  |  |  |  |  |  |  |  |  |  |  | $ 322.9 | $ 339.0 | $ 370.9 |  |
Finite Lived Intangible Assets Gross |  |  |  |  |  |  |  |  |  |  |  |  | 966.1 | 1,023.1 |  |  |
Goodwill and intangible asset impairment |  |  |  |  |  | $ 0.0 | $ 663.9 |  |  |  |  |  | 663.9 | 1,261.7 | 0.0 |  |
Impairment Charges Carrying Value |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0 |  |  |  |
Percentage of Weighted Average Perpectual Nominal Growth |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% |  |  |  |
Percentage of Weighted Average Cost of Capital |  |  |  |  |  |  |  |  |  |  |  |  | 10.50% |  |  |  |
Goodwill, Impairment Loss |  |  |  |  |  |  | 494.0 |  |  |  |  |  | $ 494.0 | 1,475.0 |  |  |
Amortization of Intangible Assets |  |  |  |  |  |  |  | $ 108.0 | $ 113.3 | $ 118.4 | $ 125.1 | $ 134.2 | $ 137.0 | $ 134.5 | $ 129.2 |  |
Finite lived intangible assets remaining estimated useful lives |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |
Starz Business of Lions Gate Entertainment Corp | Trade Names |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Impairment Loss |  |  | 170.0 | $ 170.0 |  |  | 170.0 |  |  |  |  |  |  |  |  |  |
Amortization of Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.0 |  |  |  |
Decrease In Profit Loss |  |  |  |  |  |  |  |  |  |  |  |  | 3.0 |  |  |  |
Tax benefit associated with the book amortization |  |  |  |  |  |  |  |  |  |  |  |  | 1.0 |  |  |  |
Starz Business of Lions Gate Entertainment Corp | Cable Operators Satellite Television Providers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite Lived Intangible Assets Gross |  |  |  |  |  |  |  |  |  |  |  |  | 890.1 |  |  |  |
Starz Business of Lions Gate Entertainment Corp | Starz Networks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and intangible asset impairment |  |  |  |  |  |  |  |  |  |  |  |  | 1,261.7 |  |  |  |
Goodwill impairment loss before business combination |  |  | 250.0 | 250.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Starz Business of Lions Gate Entertainment Corp | Starz Networks | Trade Names |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill Impairment Carrying Value |  |  | $ 80.0 | $ 80.0 |  |  | $ 80.0 |  |  |  |  |  |  |  |  |  |
Starz Business of Lions Gate Entertainment Corp | Lionsgate Plus |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and intangible asset impairment |  |  |  |  |  |  |  |  |  |  |  |  | 213.3 |  |  |  |
Starz Business of Lions Gate Entertainment Corp | Remaining Star Business Reporting Unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Impairment Loss |  |  |  |  |  |  |  |  |  |  |  |  | $ 494.0 |  |  |  |
Starz Business of Lions Gate Entertainment Corp | Subsequent Event | 5.5% Senior Notes Exchange |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt fixed interest rate percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.50% | 5.50%
Long term debt maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 15, 2029
Debt interest face value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 389.9
Starz Business of Lions Gate Entertainment Corp | Subsequent Event | 5.5% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest face value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 389.9
Starz Business of Lions Gate Entertainment Corp | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets useful lives |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |
Percentage Of Weighted Average Fair Value Perpectual Nominal Growth |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |
Percentage Of Weighted Average Fair Value Cost Of Capital |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |
Starz Business of Lions Gate Entertainment Corp | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets useful lives |  |  |  |  |  |  |  |  |  |  |  |  | 16 years |  |  |  |
Percentage Of Weighted Average Fair Value Perpectual Nominal Growth |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |
Percentage Of Weighted Average Fair Value Cost Of Capital |  |  |  |  |  |  |  |  |  |  |  |  | 14.00% |  |  |  |

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