Capital Stock - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	May 06, 2025	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024	May 07, 2025	May 13, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized Preferred shares (in shares)		200,000,000
Tax deficiencies associated with equity awards		$ 4.9	$ 2.4	$ 7.4
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercises in period, intrinsic value		0.1	0.2
Restricted Stock and Restricted Share Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, vested in period, fair value		$ 31.9	$ 37.9	$ 39.6
Equity instruments other than options, shares withheld for tax purposes upon vesting of restricted share units (in shares)		2,500,000	3,300,000	3,000,000.0
Other issuable shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, grants in period, total fair value		$ 2.3	$ 2.3	$ 2.3
Shares issued in period, net of shares for tax withholdings (in shares)		300,000	200,000	300,000
Minimum \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		1 year
Expiration period		7 years
Minimum \| Restricted Stock and Restricted Share Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		1 year
Maximum \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		5 years
Expiration period		10 years
Maximum \| Restricted Stock and Restricted Share Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years
New Lionsgate 2025 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued (in shares)	58,000,000
Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of securities called by each right (in shares)	1				1
Threshold percentage of common stock exercised trigger					15.00%
Share exercise price (in dollars per share)					$ 32.00
Rights are exercisable or expired (in dollars per share)					$ 0.001
Sponsor Option Agreement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, par or stated value per share (in dollars per share)						$ 0.0001
Sponsor Securities Repurchase
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued, price per share (in dollars per share)						$ 16.05
New Lionsgate Common Shares \| Old Lionsgate Class A Shareholders
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
New common stock issued, per old Lionsgate shares	1.12
New Lionsgate Common Shares \| Old Lionsgate Class E Shareholders
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
New common stock issued, per old Lionsgate shares	1
Class A Voting Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized common shares (in shares)			500,000,000
Class A Voting Shares \| Old Lionsgate
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares, shares issued (in shares)			83,700,000
Class B Non-Voting Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized common shares (in shares)			500,000,000
Class B Non-Voting Shares \| Old Lionsgate
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares, shares issued (in shares)			156,800,000

Lionsgate Studios Corp. 10-K