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Investment In Films and Television Programs and Program Rights (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
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
Write downs on investments in films and television programs and licensed program rights	$ 0.6	$ 2.1
Film, Monetized on Its Own, and Film Group, Impairment, Statement of Income [Extensible List]	lgfa:DirectOperatingCost
Motion Picture
Segment Reporting Information [Line Items]
Write downs on investments in films and television programs and licensed program rights	$ 0.6	1.6
Television Production
Segment Reporting Information [Line Items]
Write downs on investments in films and television programs and licensed program rights		$ 0.5

X

- Definition

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

+ References

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+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

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

+ 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

+ 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.

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X

- Definition

Amount of 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 (b)
-URI http://asc.fasb.org/extlink&oid=120154696&loc=SL120155252-107959

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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- 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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- Details

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Namespace Prefix:
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X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=lgfa_TelevisionProductionMember
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Period Type: