Business Combination - Schedule of Number of Common Shares Issued in Connection with Closing of Business Combination (Details) - USD ($) $ / shares in Units, $ in Millions			6 Months Ended
	May 13, 2024	May 12, 2024	Sep. 30, 2024	Mar. 31, 2024
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
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 | Lions Gate Class A Voting Shares
Business Combination Segment Allocation [Line Items]
Total outstanding (in shares)				75,000,000
Shares repurchased during period (in shares)		67,972,127
Stock repurchased		$ 730.1
Shares repurchased during period, price per share (in dollars per share)		$ 10.745
SEAC | Lions Gate Class B Non-Voting Shares
Business Combination Segment Allocation [Line Items]
Total outstanding (in shares)	2,010,000
Shares repurchased during period (in shares)	16,740,000
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
PIPE Investors | Lions Gate Class A Voting Shares | Offering Two
Business Combination Segment Allocation [Line Items]
Number of shares issued (in shares)	193,927