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Capital Stock - Schedule of Share-Based Compensation Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Share-Based Compensation Expense [Line Items]              
Total Lionsgate Studios employee share-based compensation expense $ 8.6 $ 13.5 $ 17.0 $ 21.4 $ 62.5 $ 73.4 $ 70.2
Corporate allocation of share-based compensation 6.7 3.9 10.9 7.6      
Share-based payment arrangement, total 15.3 17.4 27.9 29.0 54.8 [1] 69.2 [1] 70.2 [1]
Impact of accelerated vesting on equity awards 4.6 0.0 4.6 0.5 $ 7.7 [2] $ 4.2 [2] $ 0.0 [2]
Total share-based compensation expense 19.9 17.4 32.5 29.5      
Stock options              
Share-Based Compensation Expense [Line Items]              
Total Lionsgate Studios employee share-based compensation expense 0.2 0.5 0.4 0.9      
Restricted share units and other share-based compensation              
Share-Based Compensation Expense [Line Items]              
Total Lionsgate Studios employee share-based compensation expense 8.2 12.9 16.3 20.3      
Share appreciation rights              
Share-Based Compensation Expense [Line Items]              
Total Lionsgate Studios employee share-based compensation expense $ 0.2 $ 0.1 $ 0.3 $ 0.2      
[1] The following table reconciles total share-based compensation expense to adjusted share-based compensation expense:
[2] Represents share-based compensation expense included in restructuring and other expenses reflecting the impact of the acceleration of vesting schedules for equity awards pursuant to certain severance arrangements.