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Investment In Films and Television Programs and Program Rights (Narrative) (Details) | 6 Months Ended
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Sep. 30, 2020
Segment Reporting Information [Line Items] |
Ultimate revenue, estimates used, maximum term, motion picture | 10 years
Ultimate revenue, estimates used, maximum term, television series | 10 years
Ultimate revenue, estimates used, term, television series in production | 5 years
Ultimate revenue, estimates used, maximum term, acquired libraries | 20 years
Projects in development, potential trigger for write-off of development costs, time period from date of initial investment | 3 years
Film, Monetized on Its Own, and Film Group, Impairment, Statement of Income [Extensible List] | lgfa:DirectOperatingCost

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

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

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

X
- Definition Film, Monetized on Its Own, Amortization Period, Television Series in Production + References No definition available. + Details
Name: | lgfa_FilmMonetizedonItsOwnAmortizationPeriodTelevisionSeriesinProduction
Namespace Prefix: | lgfa_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Film, Projects in Development, Potential Trigger for Write-off of Development Costs, Time Period from Date of Initial Investment + References No definition available. + Details
Name: | lgfa_FilmProjectsinDevelopmentPotentialTriggerforWriteoffofDevelopmentCostsTimePeriodfromDateofInitialInvestment
Namespace Prefix: | lgfa_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Indicates line item in statement in which net income is reported that includes impairment loss on capitalized cost for film predominantly monetized on its own and film group. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 926 -SubTopic 20 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=120154696&loc=SL120155252-107959 + Details
Name: | us-gaap_FilmMonetizedOnItsOwnAndFilmGroupImpairmentStatementOfIncomeExtensibleList
Namespace Prefix: | us-gaap_
Data Type: | srt-types:extensibleListItemType
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