Derivative, Call Rights Exercise Period

No definition available.

Name:	lgfa_DerivativeCallRightsExercisePeriod
Namespace Prefix:	lgfa_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Derivative, Period After Expiration of Put Rights that Call Rights Begin

+ References

No definition available.

+ Details

Name:	lgfa_DerivativePeriodAfterExpirationofPutRightsthatCallRightsBegin
Namespace Prefix:	lgfa_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Exercise period for put rights.

+ References

No definition available.

+ Details

Name:	lgfa_DerivativePutRightsExercisePeriod
Namespace Prefix:	lgfa_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

+ Details

Name:	us-gaap_DerivativeTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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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No definition available.

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

- Definition

Value of new stock classified as temporary equity issued during the period.

+ References

No definition available.

+ Details

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

- Details

Name:	dei_LegalEntityAxis=lgfa_A3ArtsEntertainmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Noncontrolling Interests (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended
	May 29, 2018	Jun. 30, 2018	Jun. 30, 2017
Redeemable Noncontrolling Interest [Line Items]
Initial fair value of redeemable noncontrolling interest of 3 Arts Entertainment		$ 15.8	$ 0.0
3 Arts Entertainment
Redeemable Noncontrolling Interest [Line Items]
Initial fair value of redeemable noncontrolling interest of 3 Arts Entertainment	$ 15.8
Redeemable noncontrolling interest, ownership percentage held by noncontrolling interest holders	49.00%
Put option, term from acquisition date		5 years
Put rights exercise period		60 days
Period after expiration of put rights that cal rights begin		30 days
Call rights exercise period		60 days