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Business Combination - Number of Shares Common Shares Issued Business Combination (Details) - USD ($) |  |  | 2 Months Ended | 6 Months Ended |  |
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May 13, 2024 | May 12, 2024 | Jun. 30, 2024 | Sep. 30, 2024 | Mar. 31, 2024 | Mar. 31, 2023
Business Combination Segment Allocation [Line Items] |  |  |  |  |  |
Additional shares issued (in shares) |  |  | 448,127 |  |  |
Total shares issued in Business Combination and related transactions (in shares) | 35,245,430 |  |  |  |  |
Shares issued to Lionsgate (in shares) | 253,435,794 |  |  |  |  |
Total outstanding (in shares) | 288,681,224 |  |  |  |  |
Common shares, shares issued (in shares) |  |  |  | 288,700,000 | 253,400,000 | 253,400,000
Number of shares issued in transactions (in shares) |  | 254,200 |  |  |  |
SEAC |  |  |  |  |  |
Business Combination Segment Allocation [Line Items] |  |  |  |  |  |
Number of shares issued (in shares) | 7,027,873 |  |  |  |  |
SEAC | Offering Two |  |  |  |  |  |
Business Combination Segment Allocation [Line Items] |  |  |  |  |  |
Number of shares issued in transactions (in shares) | 254,200 |  |  |  |  |
SEAC Sponsor Options |  |  |  |  |  |
Business Combination Segment Allocation [Line Items] |  |  |  |  |  |
Number of shares issued (in shares) | 2,010,000 |  |  |  |  |
Common shares, shares issued (in shares) | 2,200,000 |  |  |  |  |
PIPE Investors |  |  |  |  |  |
Business Combination Segment Allocation [Line Items] |  |  |  |  |  |
Number of shares issued (in shares) | 25,759,430 |  |  | 16,218,402 |  |
Number of shares issued in transactions (in shares) | 18,172,378 |  |  |  |  |
Number of shares excluded for reduction rights (in shares) | 1,953,976 |  |  |  |  |
PIPE Investors | Offering One |  |  |  |  |  |
Business Combination Segment Allocation [Line Items] |  |  |  |  |  |
Number of shares issued in transactions (in shares) | 14,141,559 |  |  |  |  |
Sale of stock, share price (in dollars per share) | $ 9.63 |  |  |  |  |
PIPE Investors | Offering Two |  |  |  |  |  |
Business Combination Segment Allocation [Line Items] |  |  |  |  |  |
Number of shares issued in transactions (in shares) | 11,617,871 |  |  |  |  |
Sale of stock, share price (in dollars per share) | $ 10.165 |  |  |  |  |
Lions Gate Class A Voting Shares | SEAC |  |  |  |  |  |
Business Combination Segment Allocation [Line Items] |  |  |  |  |  |
Total outstanding (in shares) |  |  |  |  | 75,000,000 |
Shares repurchased during period (in shares) |  | 67,972,127 |  |  |  |
Stock repurchased |  | $ 730,100,000 |  |  |  |
Shares repurchased during period, price per share (in dollars per share) |  | $ 10.745 |  |  |  |
Lions Gate Class A Voting Shares | PIPE Investors | Offering Two |  |  |  |  |  |
Business Combination Segment Allocation [Line Items] |  |  |  |  |  |
Number of shares issued (in shares) | 193,927 |  |  |  |  |
Lions Gate Class B Non-Voting Shares |  |  |  |  |  |
Business Combination Segment Allocation [Line Items] |  |  |  |  |  |
Total outstanding (in shares) | 1,800,000 |  |  |  |  |
Lions Gate Class B Non-Voting Shares | SEAC |  |  |  |  |  |
Business Combination Segment Allocation [Line Items] |  |  |  |  |  |
Total outstanding (in shares) | 2,010,000 |  |  |  |  |
Shares repurchased during period (in shares) | 16,740,000 |  |  |  |  |

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