Participations and Residuals (Details) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Participations And Residuals [abstract]
Contribution of TIK Films, in general, subject to certain limitations	25.00%
Theatrical slate participation arrangement, length of term ending January 23, 2018	3 years
Theatrical slate participation arrangement, amount payable to TIK Films	$ 151.8	$ 170.1

In a theatrical slate participation arrangement, the percentage of third-party contribution towards production or acquisition costs of certain theatrical feature films released during the term of the arrangement.

No definition available.

Name:	lgfa_TheatricalSlateParticipationArrangementPercentageContribution
Namespace Prefix:	lgfa_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant