Investment In Films and Television Programs and Program Rights (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Investment In Films And Television Programs and Program Rights [Abstract]
Percentage of unamortized film costs, one year			51.00%
Percentage of unamortized film costs, three years			83.00%
Fair value film write-downs	$ 2	$ 3	$ 7	$ 12

The percentage of unamortized film costs for released films and television programs, net of accumulated amortization and excluding acquired film libraries, that it expects to amortize within three years from the date of the balance sheet.

No definition available.

Name:	lgfa_ExpectedPercentageOfCompletedFilmsAndTelevisionProgramsExcludingAcquiredLibraryNetOfAccumulatedAmortizationAmortizedDuringThreeYearPeriod
Namespace Prefix:	lgfa_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration