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Contingencies (Narrative) (Details) $ in Millions		1 Months Ended	3 Months Ended		6 Months Ended
	Oct. 09, 2018 USD ($)	Aug. 30, 2016 classActionComplaint	Sep. 30, 2021 USD ($)	Jun. 30, 2021 numberOfInsurers	Sep. 30, 2021 USD ($)	Nov. 05, 2018 USD ($)
Fiduciary Litigation
Loss Contingencies [Line Items]
Number of plaintiffs | classActionComplaint		7
Settlement payment amount	$ 92.5
Insurance reimbursement, amount	$ 37.8
Insurance Litigation
Loss Contingencies [Line Items]
Lawsuit for insurance reimbursement, amount						$ 10.0
Loss Contingency, Claims Settled, Number | numberOfInsurers				1
Net settlement amount			$ 20.2		$ 22.7

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

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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

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

X

- Definition

Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

+ Details

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

X

- Definition

Amount awarded to other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

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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

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

X

- Definition

Number of claims settled.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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