Name:	lgfa_FilmMonetizedOnItsOwnCapitalizedCostCompletedAndNotReleasedAndInProgressTheatricalFilms
Namespace Prefix:	lgfa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of capitalized unamortized costs remaining for acquired film and television libraries predominantly monetized individually.

No definition available.

Name:	lgfa_FilmMonetizedOnItsOwnCapitalizedCostsAcquiredFilmAndTelevisionLibraries
Namespace Prefix:	lgfa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

No definition available.

Name:	lgfa_FilmMonetizedOnItsOwnRemainingAmortizationPeriodAcquiredLibraries
Namespace Prefix:	lgfa_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Film, Monetized on Its Own and Film, Monetized in Film Group and License Agreement for Program Rights, Capitalized Cost

No definition available.

Name:	lgfa_FilmMonetizedonItsOwnandFilmMonetizedinFilmGroupandLicenseAgreementforProgramRightsCapitalizedCost
Namespace Prefix:	lgfa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of capitalized cost for right acquired by broadcaster under license agreement for program material.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 920
-SubTopic 350
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=120154842&loc=d3e47862-107914

Name:	us-gaap_EntertainmentLicenseAgreementForProgramMaterialCapitalizedCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of capitalized film cost for film predominantly monetized with other films and license agreements.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 50
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=120154696&loc=d3e54431-107959

Name:	us-gaap_FilmMonetizedInFilmGroupCapitalizedCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

Name:	us-gaap_FilmMonetizedInFilmGroupCapitalizedCostAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of capitalized film cost for completed and not released film predominantly monetized with other films and license agreements.

Name:	us-gaap_FilmMonetizedInFilmGroupCapitalizedCostCompletedAndNotReleased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of capitalized film cost incurred in development and preproduction of film predominantly monetized with other films and license agreements.

Name:	us-gaap_FilmMonetizedInFilmGroupCapitalizedCostDevelopmentAndPreproduction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of capitalized film cost incurred in production of film predominantly monetized with other films and license agreements.

Name:	us-gaap_FilmMonetizedInFilmGroupCapitalizedCostProduction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of capitalized film cost for released film predominantly monetized with other films and license agreements.

Name:	us-gaap_FilmMonetizedInFilmGroupCapitalizedCostReleased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of capitalized film cost for film predominantly monetized on its own.

Name:	us-gaap_FilmMonetizedOnItsOwnCapitalizedCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

Name:	us-gaap_FilmMonetizedOnItsOwnCapitalizedCostAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of capitalized film cost for completed and not released film predominantly monetized on its own.

Name:	us-gaap_FilmMonetizedOnItsOwnCapitalizedCostCompletedAndNotReleased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of capitalized film cost incurred in development and preproduction of film predominantly monetized on its own.

Name:	us-gaap_FilmMonetizedOnItsOwnCapitalizedCostDevelopmentAndPreproduction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of capitalized film cost incurred in production of film predominantly monetized on its own.

Name:	us-gaap_FilmMonetizedOnItsOwnCapitalizedCostProduction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of capitalized film cost for released film predominantly monetized on its own.

Name:	us-gaap_FilmMonetizedOnItsOwnCapitalizedCostReleased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of government assistance recognized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 832
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=128342832&loc=SL128342943-244231

Name:	us-gaap_GovernmentAssistanceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Indicates line item in statement of financial position that includes government assistance classified as current.

Name:	us-gaap_GovernmentAssistanceCurrentStatementOfFinancialPositionExtensibleEnumeration
Namespace Prefix:	us-gaap_
Data Type:	enum2:enumerationSetItemType
Balance Type:	na
Period Type:	instant

Indicates line item in statement of income or comprehensive income that includes government assistance.