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Leases (Narrative) (Details) | 9 Months Ended
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Dec. 31, 2019 renewal_period
Maximum |
Lessee, Lease, Description [Line Items] |
Leases, remaining lease term | 10 years
Building |
Lessee, Lease, Description [Line Items] |
Finance lease, number of renewal periods | 4
Finance lease, renewal term (in years) | 5 years

X
- Definition Finance Lease, Successive Renewal Periods Available for Lease Agreement + References No definition available. + Details
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Namespace Prefix: | lgfa_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Lessee, Lease, Remaining Lease Term + References No definition available. + Details
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Namespace Prefix: | lgfa_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of lessee's finance lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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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. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |