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Investment In Films and Television Programs and Program Rights (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Investment In Films And Television Programs and Program Rights [Abstract] |  |  |
Write-downs to fair value or net realizable value | $ 135.5 | $ 66.0 | $ 36.3
Write-downs to fair value or net realizable value related to motion pictures | $ 55.2 | $ 27.2 | $ 33.6
Percentage of unamortized film costs, one year | 46.70% |  |
Percentage of unamortized film costs, three years | 85.90% |  |

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
Name: | lgfa_ExpectedPercentageOfCompletedFilmsAndTelevisionProgramsExcludingAcquiredLibraryNetOfAccumulatedAmortizationAmortizedDuringThreeYearPeriod
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 Write downs to fair value or net realizable value recorded during the period related to motion pictures. + References No definition available. + Details
Name: | lgfa_FairValueFilmWriteDowns
Namespace Prefix: | lgfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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

X
- Definition Write-downs to fair value or net realizable value included in investment in films and television programs and program rights. + References No definition available. + Details
Name: | lgfa_WriteDownstoFairValueorNetRealizableValue
Namespace Prefix: | lgfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration