Acquisitions - Reconciliation of Gross Proceeds (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Mar. 31, 2025 USD ($) $ / shares
Business Combination Segment Allocation [Line Items]
Total gross cash proceeds	$ 330.0
Less: SEAC warrant exchange payment	(12.5)
Less: Legacy Lionsgate Studios transaction costs	(19.2)
Net proceeds from the Business Combination and related equity issuances per the consolidated statement of equity (deficit)	278.2
Add: Transaction costs accrued and not paid, net of transaction costs previously paid	3.5
Net cash proceeds from the Business Combination and related equity issuances per the consolidated statement of cash flows	281.7
Lions Gate Entertainment Corp.
Business Combination Segment Allocation [Line Items]
Total gross cash proceeds	330.0
Less: SEAC warrant exchange payment	(12.5)
Net proceeds from the Business Combination and related equity issuances per the consolidated statement of equity (deficit)	278.2
Add: Transaction costs accrued and not paid, net of transaction costs previously paid	3.5
Net cash proceeds from the Business Combination and related equity issuances per the consolidated statement of cash flows	281.7
SEAC | Lions Gate Entertainment Corp.
Business Combination Segment Allocation [Line Items]
Less: Legacy Lionsgate Studios transaction costs	$ (39.3)
SEAC Public Warrants
Business Combination Segment Allocation [Line Items]
Shares issued, price per share (in dollars per share) | $ / shares	$ 0.50
Warrants outstanding	$ 0.0
SEAC Public Warrants | Lions Gate Entertainment Corp.
Business Combination Segment Allocation [Line Items]
Shares issued, price per share (in dollars per share) | $ / shares	$ 0.50
Warrants outstanding	$ 0.0