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Investment In Films and Television Programs and Licensed Program Rights (Narrative) (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Mar. 31, 2021
Segment Reporting Information [Line Items] |  |
Acquired film and television libraries, unamortized costs | $ 157.5 | $ 18.3
Acquired libraries, remaining amortization period | 19 years 8 months 12 days |

X
- Definition Amount of capitalized unamortized costs remaining for acquired film and television libraries predominantly monetized individually. + References No definition available. + Details
Name: | lgfa_FilmMonetizedOnItsOwnCapitalizedCostsAcquiredFilmAndTelevisionLibraries
Namespace Prefix: | lgfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Film, Monetized on Its Own, Remaining Amortization Period, Acquired Libraries + References No definition available. + Details
Name: | lgfa_FilmMonetizedOnItsOwnRemainingAmortizationPeriodAcquiredLibraries
Namespace Prefix: | lgfa_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration