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Financial Instruments (Forward Interest Rate Swap Agreements) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Mar. 31, 2019	Dec. 24, 2018	Jul. 31, 2018	Jun. 25, 2018	May 23, 2018
Interest Rate Swap
Derivative [Line Items]
Notional amount	$ 1,700.0	$ 1,700.0		$ 300.0	$ 200.0	$ 1,000.0
Fixed interest rate				2.885%	2.723%	2.915%
Interest rate swap agreements - fixed rate paid 2.744%
Derivative [Line Items]
Notional amount			$ 50.0
Fixed interest rate			2.744%
Interest rate swap agreements - fixed rate paid 2.808%
Derivative [Line Items]
Notional amount			$ 100.0
Fixed interest rate			2.808%
Interest rate swap - fixed rate paid 2.728%
Derivative [Line Items]
Notional amount			$ 50.0
Fixed interest rate			2.728%

X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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

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

X

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

+ Details

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Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
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X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=lgfa_InterestRateSwapFixedRatePaid2.744Member
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=lgfa_InterestRateSwapFixedRatePaid2.808Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=lgfa_InterestRateSwapFixedRatePaid2.728Member
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