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Investment In Films and Television Programs and Program Rights (Narrative) (Details) $ in Millions	9 Months Ended
	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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Balance Type:	debit
Period Type:	instant

X

- Definition

Film, Monetized on Its Own, Remaining Amortization Period, Acquired Libraries

+ References

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X

- Definition

Film, Monetized on Its Own, Amortization Period, Acquired Libraries

+ References

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X

- Definition

Film, Monetized on Its Own, Amortization Period, Motion Picture

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
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X

- Definition

Film, Monetized on Its Own, Amortization Period, Television Series

+ References

No definition available.

+ Details

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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

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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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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.

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