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Leases (Narrative) (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Lessee, Lease, Description [Line Items] |  |
Change in finance lease right-of-use asset from reclassifcation | $ (42.0) | $ 0.0
Change in finance lease liability due to a reassessment event | (48.6) | 0.0
Change in operating lease right-of-use asset from reclassifcation | 6.0 | 0.0
Change in operating lease liability due to a reassessment event | $ 12.6 | $ 0.0
Maximum |  |
Lessee, Lease, Description [Line Items] |  |
Leases, remaining lease term | 10 years |

X
- Definition Finance Lease, Lease Liability, Increase (Decrease) From Reclassification + References No definition available. + Details
Name: | lgfa_FinanceLeaseLeaseLiabilityIncreaseDecreaseFromReclassification
Namespace Prefix: | lgfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Finance Lease, Right-of-Use Asset, Increase (Decrease) From Reclassification + References No definition available. + Details
Name: | lgfa_FinanceLeaseRightOfUseAssetIncreaseDecreaseFromReclassification
Namespace Prefix: | lgfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition Operating Lease, Lease Liability, Increase (Decrease) From Reclassification + References No definition available. + Details
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Namespace Prefix: | lgfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Operating Lease, Right-of-Use Asset, Increase (Decrease) From Reclassification + References No definition available. + Details
Name: | lgfa_OperatingLeaseRightOfUseAssetIncreaseDecreaseFromReclassification
Namespace Prefix: | lgfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |