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Subsequent Events - Narrative (Details) - USD ($) |  |  |  |  | 8 Months Ended | 9 Months Ended |  |  |  |  |
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Jan. 01, 2025 | May 13, 2024 | May 08, 2024 | May 01, 2024 | Dec. 31, 2024 | Dec. 31, 2024 | Apr. 15, 2029 | Feb. 10, 2025 | Jan. 31, 2025 | Sep. 30, 2024 | Mar. 31, 2024
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of private placement |  | $ 254,300,000 |  |  | $ 254,300,000 | $ 254,300,000 |  |  |  |  |
Interest rate swaps | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  |  |  | $ 1,700,000,000 | $ 1,700,000,000
Revolving Credit Facility Including Letter of Credit |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum principal amount |  |  |  |  |  |  |  |  |  |  | 1,250,000,000
Letter of credit outstanding |  |  |  |  |  |  |  |  |  |  | $ 0
Production Tax Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum principal amount |  |  |  |  | $ 260,000,000 | 260,000,000 |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds From Reverse Recapitalization Transaction Received After Business Combination |  |  | $ 330,000,000 |  |  |  |  |  |  |  |
Proceeds From Reverse Recapitalization Transaction Receivable |  |  | $ 20,000,000 |  |  |  |  |  |  |  |
Subsequent Event | Interest rate swaps | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  |  | $ 100,000,000 |  |
Derivative, Fixed Interest Rate |  |  |  |  |  |  |  |  | 4.06% |  |
Carrying value of the fair value for titles removed | $ 77,400,000 |  |  |  |  |  |  |  |  |  |
Subsequent Event | Lionsgate Studios | SEAC |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Ownership Percentage, Parent |  |  | 87.80% |  |  |  |  |  |  |  |
Subsequent Event | Screaming Eagle | Lionsgate Studios | SEAC |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Ownership Percentage, Noncontrolling Owner |  |  | 12.20% |  |  |  |  |  |  |  |
Subsequent Event | 5.5% Senior Notes Exchange |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long term debt fixed interest rate percentage |  |  | 5.50% |  |  |  |  |  |  |  |
Subsequent Event | Forecast |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of private placement |  |  | $ 254,300,000 |  |  |  |  |  |  |  |
Subsequent Event | 5.500 Senior Notes |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt interest face value |  |  | $ 389,900,000 |  |  |  |  |  |  |  |
Subsequent Event | 5.500 Senior Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate (as percent) |  |  | 5.50% |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Increase (Decrease) |  |  | 6.00% |  |  |  |  |  |  |  |
Subsequent Event | Production Tax Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum principal amount |  |  |  |  |  |  |  | $ 280,000,000 |  |  |
Starz Business of Lions Gate Entertainment Corp |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying value of the fair value for titles removed |  |  |  |  |  | $ 77,400,000 |  |  |  |  |
Starz Business of Lions Gate Entertainment Corp | Intercompany Revolver |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument variable interest rate percentage |  | 1.75% |  |  |  |  |  |  |  |  |
Credit facility, maximum principal amount |  | $ 150,000,000 |  |  |  |  |  |  |  |  |
Starz Business of Lions Gate Entertainment Corp | Subsequent Event | 5.5% Senior Notes Exchange |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt interest face value |  |  | $ 389,900,000 |  |  |  |  |  |  |  |
Long term debt maturity date |  |  | Apr. 15, 2029 |  |  |  | Apr. 15, 2029 |  |  |  |
Long term debt fixed interest rate percentage |  |  | 5.50% |  |  |  | 5.50% |  |  |  |
Long term debt interest rate percentage in the future |  |  | 6.00% |  |  |  |  |  |  |  |
Long term debt future maturity date |  |  | Apr. 15, 2030 |  |  |  |  |  |  |  |
Starz Business of Lions Gate Entertainment Corp | Subsequent Event | Intercompany Revolver |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit maximum amount that may be owed |  |  |  | $ 150,000,000 |  |  |  |  |  |  |
Debt instrument variable interest rate percentage |  |  |  | 1.75% |  |  |  |  |  |  |
Starz Business of Lions Gate Entertainment Corp | Subsequent Event | Revolving Credit Facility Including Letter of Credit |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum principal amount |  |  |  | $ 150,000,000 |  |  |  |  |  |  |
Letter of credit outstanding |  |  |  | $ 1,250,000,000 |  |  |  |  |  |  |

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