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Investment in Films and Television Programs - (Summary) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Film Group Monetization    
Released, net of accumulated amortization $ 987.3 $ 992.2
Completed and not released 135.1 225.4
In progress 783.0 644.4
Total 1,992.6 1,929.0
Unamortized balance of completed and not released and in progress theatrical films 680.9  
Acquired film and television libraries, unamortized costs   223.1
Production tax credits reduced 243.6  
Reduction of direct operating expense 112.0 70.6
LIONS GATE ENTERTAINMENT CORP. [Member]    
Individual Monetization    
Released, net of accumulated amortization 822.7 878.3
Completed and not released 135.1 225.4
In progress 663.4 469.2
In development 76.6 65.7
Total 1,697.8 1,638.6
Film Group Monetization    
Released, net of accumulated amortization 535.8 497.1
Completed and not released 301.9 170.1
In progress 116.6 179.0
In development 17.7 4.3
Total 972.0 850.5
Licensed program rights, net of accumulated amortization 243.3 273.1
Investment in films and television programs and licensed program rights, net 2,913.1 2,762.2
Unamortized balance of completed and not released and in progress theatrical films 680.9  
Acquired film and television libraries, unamortized costs $ 235.7 223.1
Acquired libraries, remaining amortization period 13 years 3 months 18 days  
Production tax credits reduced $ 243.6 112.2
Reduction of direct operating expense $ 112.0 $ 70.6