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Investment In Films and Television Programs and Licensed Program Rights (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Dec. 31, 2024	Mar. 31, 2024
Segment Reporting Information [Line Items]
Acquired film and television libraries, unamortized costs	$ 245.0	$ 223.1
Acquired libraries, remaining amortization period	13 years 6 months

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

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