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Fair Value Measurements - Schedule of Carrying Values and Fair Values of Company's Outstanding Debt, Film Related Obligations, and Interest Rate Swaps (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Mar. 31, 2024
Mar. 31, 2023
Carrying Value | Production Loans      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Loans, fair value disclosure $ 1,239.4 $ 1,286.2  
Level 2 | Fair Value | Production Loans      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Loans, fair value disclosure 1,244.8 1,292.2  
Term Loan A      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Carrying Value   396.6 $ 424.2
Backlog Facility and Other, IP Credit Facility and Financing component of interest rate swaps, fair value disclosure   397.3 415.4
Term Loan B      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Carrying Value   816.9 827.2
Backlog Facility and Other, IP Credit Facility and Financing component of interest rate swaps, fair value disclosure   818.1 817.1
Production Loans      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Carrying Value   1,286.2 1,346.1
Backlog Facility and Other, IP Credit Facility and Financing component of interest rate swaps, fair value disclosure   1,292.2 1,349.9
IP Credit Facility      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Carrying Value   107.6 140.8
Backlog Facility and Other, IP Credit Facility and Financing component of interest rate swaps, fair value disclosure   109.9 143.8
5.5% Senior Notes      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Carrying Value 698.2 696.6  
Backlog Facility and Other, IP Credit Facility and Financing component of interest rate swaps, fair value disclosure 581.4 536.2  
Programming Notes      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Carrying Value 67.9 0.0  
Backlog Facility and Other, IP Credit Facility and Financing component of interest rate swaps, fair value disclosure 67.9 0.0  
Intercompany Revolver | Carrying Value | Revolving Credit Facility      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Line of credit facility, fair value disclosure 80.4 0.0  
Intercompany Revolver | Level 2 | Fair Value | Revolving Credit Facility      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Line of credit facility, fair value disclosure 80.4 0.0  
LGTV Revolver | Carrying Value | Revolving Credit Facility      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Line of credit facility, fair value disclosure 417.6 569.9  
LGTV Revolver | Level 2 | Fair Value | Revolving Credit Facility      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Line of credit facility, fair value disclosure 421.5 575.0  
LGTV Term Loan A | Carrying Value | Term Loans      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Loans, fair value disclosure 312.9 396.6  
LGTV Term Loan A | Level 2 | Fair Value | Term Loans      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Loans, fair value disclosure 312.9 397.3  
LGTV Term Loan B | Carrying Value | Term Loans      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Loans, fair value disclosure 249.7 816.9  
LGTV Term Loan B | Level 2 | Fair Value | Term Loans      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Loans, fair value disclosure 249.7 818.1  
eOne IP Credit Facility | Carrying Value | Line of Credit      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Line of credit facility, fair value disclosure 334.0 0.0  
eOne IP Credit Facility | Level 2 | Fair Value | Line of Credit      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Line of credit facility, fair value disclosure 340.0 0.0  
LG IP Credit Facility | Carrying Value | Line of Credit      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Line of credit facility, fair value disclosure 447.9 0.0  
LG IP Credit Facility | Level 2 | Fair Value | Line of Credit      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Line of credit facility, fair value disclosure 455.0 0.0  
Production Tax Credit Facility      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Carrying Value   258.7 229.4
Backlog Facility and Other, IP Credit Facility and Financing component of interest rate swaps, fair value disclosure   260.0 231.8
Production Tax Credit Facility | Carrying Value | Line of Credit      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Line of credit facility, fair value disclosure 259.6 258.7  
Production Tax Credit Facility | Level 2 | Fair Value | Line of Credit      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Line of credit facility, fair value disclosure 260.0 260.0  
Backlog Facility and Other      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Carrying Value   285.4 223.7
Backlog Facility and Other, IP Credit Facility and Financing component of interest rate swaps, fair value disclosure   287.3 226.0
Backlog Facility and Other | Carrying Value | Secured Debt      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Backlog Facility and Other, IP Credit Facility and Financing component of interest rate swaps, fair value disclosure 271.9 285.4  
Backlog Facility and Other | Level 2 | Fair Value | Secured Debt      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Backlog Facility and Other, IP Credit Facility and Financing component of interest rate swaps, fair value disclosure 273.2 287.3  
Film Library Facility | Carrying Value | Secured Debt      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Backlog Facility and Other, IP Credit Facility and Financing component of interest rate swaps, fair value disclosure 92.3 107.6  
Film Library Facility | Level 2 | Fair Value | Secured Debt      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Backlog Facility and Other, IP Credit Facility and Financing component of interest rate swaps, fair value disclosure $ 94.2 109.9  
Starz Business of Lions Gate Entertainment Corp | 5.5% Senior Notes | Fair Value, Recurring | Level 2      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Carrying Value   696.6 776.0
Backlog Facility and Other, IP Credit Facility and Financing component of interest rate swaps, fair value disclosure   536.2 510.0
Starz Business of Lions Gate Entertainment Corp | Programming Notes | Fair Value, Recurring | Level 2      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis [Line Items]      
Carrying Value   0.0 83.6
Backlog Facility and Other, IP Credit Facility and Financing component of interest rate swaps, fair value disclosure   $ 0.0 $ 83.6