Investment in Films and Television Programs - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Investment in Films And Television Programs [Abstract]
Acquired film and television libraries, unamortized costs	$ 235.7	$ 223.1
Acquired libraries, remaining amortization period (in years)	13 years 3 months 18 days
Amortization of films and television programs and program rights	$ 1,642.1	$ 1,347.8	$ 1,649.3