Capital Stock - Shares Reserved for Future Issuance (Details) - Lions Gate Entertainment Corp. - shares shares in Millions	Mar. 31, 2025	Mar. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)	43.2	49.5
Stock options and share appreciation rights (SARs) outstanding
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)	18.3	20.7
Restricted Stock and Restricted Share Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)	14.4	13.4
Common shares available for future issuance
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)	10.5	15.4