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Share-Based Compensation - Summary Of Stock Option, And Share Appreciation Rights (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
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Jun. 30, 2024 | Mar. 31, 2024
Common Class A | Restricted Stock And Restricted Stock Unit |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |
Outstanding, weighted average grant-date fair value (in USD per share), beginning balance | $ 9.27 | $ 10.95
Weighted- Average Grant- Date Fair Value Granted |  | 8.87
Weighted- Average Grant- Date Fair Value Vested |  | 10.89
Weighted- Average Grant- Date Fair Value Forfeited |  | 0
Outstanding, weighted average grant-date fair value (in USD per share), ending balance |  | $ 9.27
Common Class A | Two Thousand And Nineteen Lions Gate Plan | Stock Option And Share Appreciation Rights |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |
Number of Shares, beginning balance | 2,400,000 | 4,300,000
Forfeited or expired (in shares) |  | (1,900,000)
Number of Shares, ending balance |  | 2,400,000
Number of Shares, Vested or expected to vest |  | 2,400,000
Number of Shares, Exercisable |  | 2,400,000
Outstanding, weighted average exercise price (in USD per share), beginning Balance | $ 22.96 | $ 26.35
Options exercised, weighted average exercise price (in USD per share) |  | 7.7
Forfeited or expired, weighted average exercise price (in USD per share) |  | 30.81
Outstanding, weighted average exercise price (in USD per share), ending balance |  | 22.96
Weighted- Average Exercise Price Vested or expected to vest |  | 22.96
Weighted- Average Exercise Price Exercisable Exercised Forfeited or expired |  | $ 22.96
Weighted- Average Remaining Contractual Term Ending |  | 2 years 6 months 3 days
Weighted- Average Remaining Contractual Term Vested or expected to vest |  | 2 years 6 months 3 days
Weighted- Average Remaining Contractual Term |  | 2 years 6 months 3 days
Aggregate Intrinsic Value Ending |  | $ 0.1
Aggregate Intrinsic Value Vested or expected to vest |  | 0.1
Aggregate Intrinsic Value Exercisable |  | $ 0.1
Common Class B | Restricted Stock And Restricted Stock Unit |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |
Outstanding, weighted average grant-date fair value (in USD per share), beginning balance | $ 8.93 | $ 9.9
Weighted- Average Grant- Date Fair Value Granted |  | 8.22
Weighted- Average Grant- Date Fair Value Vested |  | 9.37
Weighted- Average Grant- Date Fair Value Forfeited |  | 8.64
Outstanding, weighted average grant-date fair value (in USD per share), ending balance |  | $ 8.93
Common Class B | Two Thousand And Nineteen Lions Gate Plan | Stock Option And Share Appreciation Rights |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |
Number of Shares, beginning balance | 17,100,000 | 19,000,000
Granted (in shares) |  | 300,000
Options exercised (in shares) |  | (100,000)
Forfeited or expired (in shares) |  | (2,100,000)
Number of Shares, ending balance |  | 17,100,000
Number of Shares, Vested or expected to vest |  | 17,000,000
Number of Shares, Exercisable |  | 16,400,000
Outstanding, weighted average exercise price (in USD per share), beginning Balance | $ 13.92 | $ 15.5
Granted, weighted average exercise price (in USD per share) |  | 8.88
Options exercised, weighted average exercise price (in USD per share) |  | 7.11
Forfeited or expired, weighted average exercise price (in USD per share) |  | 27.72
Outstanding, weighted average exercise price (in USD per share), ending balance |  | 13.92
Weighted- Average Exercise Price Vested or expected to vest |  | 13.94
Weighted- Average Exercise Price Exercisable Exercised Forfeited or expired |  | $ 14.16
Weighted- Average Remaining Contractual Term Ending |  | 5 years 1 month 13 days
Weighted- Average Remaining Contractual Term Vested or expected to vest |  | 5 years 1 month 9 days
Weighted- Average Remaining Contractual Term |  | 4 years 11 months 15 days
Aggregate Intrinsic Value Ending |  | $ 5.9
Aggregate Intrinsic Value Vested or expected to vest |  | 5.9
Aggregate Intrinsic Value Exercisable |  | $ 5.6
Common Class B | Starz Business of Lions Gate Entertainment Corp | Restricted Stock And Restricted Stock Unit |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |
Outstanding, weighted average grant-date fair value (in USD per share), beginning balance | $ 8.62 | $ 9.46
Weighted- Average Grant- Date Fair Value Granted |  | 8.16
Weighted- Average Grant- Date Fair Value Vested |  | 9.23
Weighted- Average Grant- Date Fair Value Forfeited |  | 8.49
Outstanding, weighted average grant-date fair value (in USD per share), ending balance |  | $ 8.62
Class B Non Voting Shares | Starz Business of Lions Gate Entertainment Corp | Two Thousand And Nineteen Lions Gate Plan | Stock Option And Share Appreciation Rights |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |
Number of Shares, beginning balance | 1.3 | 1.5
Granted (in shares) | 0 |
Options exercised (in shares) | 0 |
Forfeited or expired (in shares) | 0 | (0.2)
Number of Shares, ending balance | 1.3 | 1.3
Number of Shares, Vested or expected to vest |  | 1.3
Number of Shares, Exercisable |  | 1.3
Outstanding, weighted average exercise price (in USD per share), beginning Balance | $ 11.14 | $ 11.89
Granted, weighted average exercise price (in USD per share) | 0 |
Options exercised, weighted average exercise price (in USD per share) | 7.13 | 7.13
Forfeited or expired, weighted average exercise price (in USD per share) | 0 | 15.56
Outstanding, weighted average exercise price (in USD per share), ending balance | $ 11.14 | 11.14
Weighted- Average Exercise Price Vested or expected to vest |  | 11.14
Weighted- Average Exercise Price Exercisable Exercised Forfeited or expired |  | $ 11.14
Weighted- Average Remaining Contractual Term Ending |  | 4 years 9 months 10 days
Weighted- Average Remaining Contractual Term Vested or expected to vest |  | 4 years 9 months 10 days
Weighted- Average Remaining Contractual Term |  | 4 years 9 months 10 days
Aggregate Intrinsic Value Ending |  | $ 0.4
Aggregate Intrinsic Value Vested or expected to vest |  | 0.4
Aggregate Intrinsic Value Exercisable |  | $ 0.4
Class B Non Voting Shares | Starz Business of Lions Gate Entertainment Corp | Two Thousand And Nineteen Lions Gate Plan | Restricted Stock And Restricted Stock Unit |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |
Number of Shares, beginning balance | 3.4 |
Granted (in shares) | 0 |
Options exercised (in shares) | (0.1) |
Forfeited or expired (in shares) | 0 |
Number of Shares, ending balance | 3.3 | 3.4
Outstanding, weighted average grant-date fair value (in USD per share), beginning balance | $ 8.62 |
Weighted- Average Grant- Date Fair Value Granted | 7.96 |
Weighted- Average Grant- Date Fair Value Vested | 8.75 |
Weighted- Average Grant- Date Fair Value Forfeited | 5.69 |
Outstanding, weighted average grant-date fair value (in USD per share), ending balance | $ 8.62 | $ 8.62

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