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Investment in Films and Television Programs - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 26, 2023
Jul. 31, 2022
Jun. 30, 2024
Jun. 30, 2023
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2023
Schedule of Investments [Line Items]                  
Unamortized Film and Television Libraries Cost         $ 223.1 $ 132.8      
Operating Cycle                 12 years 9 months 18 days
Film, monetized in film group, amortization expense $ 10.0 $ 10.0     1,347.8 $ 1,649.3 $ 1,497.5 $ 171.4  
Acquired film and television libraries, unamortized costs     $ 266.4   $ 223.1        
Acquired libraries, remaining amortization period (in years)     13 years            
Amortization of films and television programs and program rights     $ 230.5 $ 254.1