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Investment In Films and Television Programs and Program Rights (Narrative) (Details) | 12 Months Ended
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Mar. 31, 2018
Investment In Films And Television Programs and Program Rights [Abstract] |
Percentage of unamortized film costs, one year | 47.30%
Percentage of unamortized film costs, three years | 82.30%

X
- Definition 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. + References No definition available. + Details
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Namespace Prefix: | lgfa_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition 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 one year from the date of the balance sheet. + References No definition available. + Details
Name: | lgfa_ExpectedPercentageOfCompletedFilmsAndTelevisionProgramsNetOfAccumulatedAmortizationAmortizedDuringOneYearPeriod
Namespace Prefix: | lgfa_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Investment In Films And Television Programs and Program Rights. + References No definition available. + Details
Name: | lgfa_InvestmentInFilmsAndTelevisionProgramsandProgramRightsAbstract
Namespace Prefix: | lgfa_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration