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Description of Business, Basis of Presentation and Significant Accounting Policies (Details)		3 Months Ended	12 Months Ended
	May 06, 2025 USD ($)	Jun. 30, 2025 USD ($) segment	Mar. 31, 2024 USD ($)	Mar. 31, 2025 USD ($)	Aug. 27, 2024	May 31, 2024 USD ($)
Debt Instrument
Cumulative impairment to date, restructuring and related activities		$ 456,700,000
Number of reportable segments | segment		1
Segment Reporting, Reconciling Item, Corporate Nonsegment | Related Party
Debt Instrument
Business separation cost	$ 10,000,000		$ 10,000,000.0
Senior Notes
Debt Instrument
Debt instrument, interest rate, stated percentage						5.50%
Existing Notes | Senior Notes
Debt Instrument
Debt instrument, interest rate, stated percentage		5.50%			5.50%	5.50%
Long-term debt		$ 325,100,000		$ 325,100,000		$ 325,100,000
Exchange Notes | Senior Notes
Debt Instrument
Debt instrument, interest rate, stated percentage						5.50%
Long-term debt				$ 389,900,000		$ 389,900,000
Credit Agreement | Secured Debt
Debt Instrument
Revolving credit facility, maximum borrowing capacity						300,000,000
Credit Agreement | Revolving Credit Facility
Debt Instrument
Revolving credit facility, maximum borrowing capacity						$ 150,000,000
New Lionsgate | Old Lionsgate Class A Shareholders
Debt Instrument
Shares conversion rate (in shares)	1.12
New Lionsgate | Old Lionsgate Class B Shareholders
Debt Instrument
Shares conversion rate (in shares)	1
Starz Entertainment Corp | Old Lionsgate Class A Shareholders
Debt Instrument
Shares conversion rate (in shares)	1.12
Starz Entertainment Corp | Old Lionsgate Class B Shareholders
Debt Instrument
Shares conversion rate (in shares)	1

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