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Contingencies (Narrative) (Details) - Fiduciary Litigation $ in Millions |  | 1 Months Ended |
--- | --- | --- | ---
Oct. 09, 2018 USD ($) | Aug. 30, 2016 class_action_complaint | Nov. 05, 2018 USD ($)
Loss Contingencies [Line Items] |  |  |
Number of plaintiffs | class_action_complaint |  | 7 |
Settlement payment amount | $ 92.5 |  |
Insurance reimbursement, amount | $ 37.8 |  |
Lawsuit for insurance reimbursement, amount |  |  | $ 10.0

X
- Definition Amounts received in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. + References No definition available. + Details
Name: | lgfa_InsuranceReimbursementAmount
Namespace Prefix: | lgfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Pursuant to a lawsuit filed by an insurer seeking declaratory judgment for reimbursement of its agreed upon payment, amount sought for reimbursement. + References No definition available. + Details
Name: | lgfa_LawsuitforInsuranceReimbursementAmount
Namespace Prefix: | lgfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount awarded to other party in judgment or settlement of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmountAwardedToOtherParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of plaintiffs that have filed claims pertaining to a loss contingency. + References No definition available. + Details
Name: | us-gaap_LossContingencyNumberOfPlaintiffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_LitigationCaseAxis=lgfa_FiduciaryLitigationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |