Financial Instruments - Forward Foreign Exchange Contracts (Details) € in Millions, Ft in Millions, $ in Millions, $ in Millions, $ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2025 EUR (€)	Mar. 31, 2025 USD ($)	Mar. 31, 2025 CAD ($)	Mar. 31, 2025 MXN ($)	Mar. 31, 2025 HUF (Ft)	Mar. 31, 2025 NZD ($)	Mar. 31, 2024 USD ($)
Derivative [Line Items]
Remaining maturity of forward foreign exchange contracts (in months)	24 months
Lions Gate Entertainment Corp.
Derivative [Line Items]
Remaining maturity of forward foreign exchange contracts (in months)	24 months
Interest rate swaps | Designated as Hedging Instrument
Derivative [Line Items]
US Dollar Amount or Notional Amount		$ 727.8					$ 1,700.0
Interest rate swaps | Designated as Hedging Instrument | Lions Gate Entertainment Corp.
Derivative [Line Items]
US Dollar Amount or Notional Amount		727.8					$ 1,700.0
Interest rate swaps | Interest Rate Swap, Fixed Rate Paid 4.045%, Effective Date August 15, 2024 | Designated as Hedging Instrument
Derivative [Line Items]
US Dollar Amount or Notional Amount		$ 65.0
Fixed rate paid (as percent)	4.045%	4.045%	4.045%	4.045%	4.045%	4.045%
Interest rate swaps | Interest Rate Swap, Fixed Rate Paid 4.045%, Effective Date August 15, 2024 | Designated as Hedging Instrument | Lions Gate Entertainment Corp.
Derivative [Line Items]
US Dollar Amount or Notional Amount		$ 65.0
Fixed rate paid (as percent)	4.045%	4.045%	4.045%	4.045%	4.045%	4.045%
Interest rate swaps | Interest Rate Swap, Fixed Rate Paid 3.803%, Effective Date August 15, 2024 | Designated as Hedging Instrument
Derivative [Line Items]
US Dollar Amount or Notional Amount		$ 77.5
Fixed rate paid (as percent)	3.803%	3.803%	3.803%	3.803%	3.803%	3.803%
Interest rate swaps | Interest Rate Swap, Fixed Rate Paid 3.803%, Effective Date August 15, 2024 | Designated as Hedging Instrument | Lions Gate Entertainment Corp.
Derivative [Line Items]
US Dollar Amount or Notional Amount		$ 77.5
Fixed rate paid (as percent)	3.803%	3.803%	3.803%	3.803%	3.803%	3.803%
Interest rate swaps | Interest Rate Swap, Fixed Rate Paid 3.810%, Effective Date August 15, 2024 | Designated as Hedging Instrument
Derivative [Line Items]
US Dollar Amount or Notional Amount		$ 77.5
Fixed rate paid (as percent)	3.81%	3.81%	3.81%	3.81%	3.81%	3.81%
Interest rate swaps | Interest Rate Swap, Fixed Rate Paid 3.810%, Effective Date August 15, 2024 | Designated as Hedging Instrument | Lions Gate Entertainment Corp.
Derivative [Line Items]
US Dollar Amount or Notional Amount		$ 77.5
Fixed rate paid (as percent)	3.81%	3.81%	3.81%	3.81%	3.81%	3.81%
Interest rate swaps | Interest Rate Swap, Fixed Rate Paid 3.970%, Effective Date December 15, 2024 | Designated as Hedging Instrument
Derivative [Line Items]
US Dollar Amount or Notional Amount		$ 125.0
Fixed rate paid (as percent)	3.97%	3.97%	3.97%	3.97%	3.97%	3.97%
Interest rate swaps | Interest Rate Swap, Fixed Rate Paid 3.970%, Effective Date December 15, 2024 | Designated as Hedging Instrument | Lions Gate Entertainment Corp.
Derivative [Line Items]
US Dollar Amount or Notional Amount		$ 125.0
Fixed rate paid (as percent)	3.97%	3.97%	3.97%	3.97%	3.97%	3.97%
Interest rate swaps | Interest Rate Swap, Fixed Rate Paid 4.060%, Effective Date January 31, 2025 | Designated as Hedging Instrument
Derivative [Line Items]
US Dollar Amount or Notional Amount		$ 100.0
Fixed rate paid (as percent)	4.06%	4.06%	4.06%	4.06%	4.06%	4.06%
Interest rate swaps | Interest Rate Swap, Fixed Rate Paid 4.060%, Effective Date January 31, 2025 | Designated as Hedging Instrument | Lions Gate Entertainment Corp.
Derivative [Line Items]
US Dollar Amount or Notional Amount		$ 100.0
Fixed rate paid (as percent)	4.06%	4.06%	4.06%	4.06%	4.06%	4.06%
Interest rate swaps | Interest Rate Swap, Fixed Rate Paid 4.097%, Effective Date February 14, 2027 | Designated as Hedging Instrument
Derivative [Line Items]
US Dollar Amount or Notional Amount		$ 282.8
Fixed rate paid (as percent)	4.097%	4.097%	4.097%	4.097%	4.097%	4.097%
Interest rate swaps | Interest Rate Swap, Fixed Rate Paid 4.097%, Effective Date February 14, 2027 | Designated as Hedging Instrument | Lions Gate Entertainment Corp.
Derivative [Line Items]
US Dollar Amount or Notional Amount		$ 282.8
Fixed rate paid (as percent)	4.097%	4.097%	4.097%	4.097%	4.097%	4.097%
Euro | Forward exchange contracts
Derivative [Line Items]
US Dollar Amount or Notional Amount	€ 40.7	$ 43.6
Weighted Average Exchange Rate Per $1 USD	0.92	0.92	0.92	0.92	0.92	0.92
Euro | Forward exchange contracts | Lions Gate Entertainment Corp.
Derivative [Line Items]
US Dollar Amount or Notional Amount	€ 40.7	$ 43.6
Weighted Average Exchange Rate Per $1 USD	0.92	0.92	0.92	0.92	0.92	0.92
Canadian Dollar | Forward exchange contracts
Derivative [Line Items]
US Dollar Amount or Notional Amount		$ 10.6	$ 15.5
Weighted Average Exchange Rate Per $1 USD	1.40	1.40	1.40	1.40	1.40	1.40
Canadian Dollar | Forward exchange contracts | Lions Gate Entertainment Corp.
Derivative [Line Items]
US Dollar Amount or Notional Amount		$ 10.6	$ 15.5
Weighted Average Exchange Rate Per $1 USD	1.40	1.40	1.40	1.40	1.40	1.40
Mexican Peso | Forward exchange contracts
Derivative [Line Items]
US Dollar Amount or Notional Amount		$ 3.4		$ 69.5
Weighted Average Exchange Rate Per $1 USD	20.63	20.63	20.63	20.63	20.63	20.63
Mexican Peso | Forward exchange contracts | Lions Gate Entertainment Corp.
Derivative [Line Items]
US Dollar Amount or Notional Amount		$ 3.4		$ 69.5
Weighted Average Exchange Rate Per $1 USD	20.63	20.63	20.63	20.63	20.63	20.63
Hungarian Forint | Forward exchange contracts
Derivative [Line Items]
US Dollar Amount or Notional Amount		$ 16.0			Ft 6,000.0
Weighted Average Exchange Rate Per $1 USD	374.00	374.00	374.00	374.00	374.00	374.00
Hungarian Forint | Forward exchange contracts | Lions Gate Entertainment Corp.
Derivative [Line Items]
US Dollar Amount or Notional Amount		$ 16.0			Ft 6,000.0
Weighted Average Exchange Rate Per $1 USD	374.00	374.00	374.00	374.00	374.00	374.00
New Zealand Dollar | Forward exchange contracts
Derivative [Line Items]
US Dollar Amount or Notional Amount		$ 3.9				$ 6.4
Weighted Average Exchange Rate Per $1 USD	1.66	1.66	1.66	1.66	1.66	1.66
New Zealand Dollar | Forward exchange contracts | Lions Gate Entertainment Corp.
Derivative [Line Items]
US Dollar Amount or Notional Amount		$ 3.9				$ 6.4
Weighted Average Exchange Rate Per $1 USD	1.66	1.66	1.66	1.66	1.66	1.66