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Investment In Films and Television Programs and Program Rights (Narrative) (Details) $ in Millions | 9 Months Ended
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Dec. 31, 2020 USD ($)
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
Acquired film and television libraries, unamortized costs | $ 26.0
Acquired libraries, remaining amortization period | 20 years

X
- Definition Amount of capitalized unamortized costs remaining for acquired film and television libraries predominantly monetized individually. + References No definition available. + Details
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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 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
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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
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