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Capital Stock - Narrative (Details) - $ / shares
3 Months Ended
Jun. 30, 2026
May 07, 2026
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Authorized Preferred shares (in shares) 200,000,000  
Preferred stock, shares issued (in shares) 0  
New Lionsgate 2025 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares issued (in shares) 58,000,000  
Minimum | Stock options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 1 year  
Expiration period 7 years  
Minimum | Restricted share units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 1 year  
Maximum | Stock options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 5 years  
Expiration period 10 years  
Maximum | Restricted share units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 5 years  
Rights    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of securities called by each right (in shares)   1
Share exercise price (in dollars per share)   $ 32.00