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Subsequent Events (Narrative) (Details) - Revolving Credit Facility - USD ($) $ in Millions | Nov. 04, 2021 | Sep. 30, 2021
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Subsequent Event [Line Items] |  |
Revolving credit facility, maximum borrowing capacity |  | $ 1,500.0
2023 Revolving Credit Facility |  |
Subsequent Event [Line Items] |  |
Revolving credit facility, maximum borrowing capacity |  | 250.0
2026 Revolving Credit Facility |  |
Subsequent Event [Line Items] |  |
Revolving credit facility, maximum borrowing capacity |  | $ 1,250.0
Subsequent Event | 2023 Revolving Credit Facility |  |
Subsequent Event [Line Items] |  |
Amount of revolving credit facility commitments terminated | $ 250.0 |
Subsequent Event | 2026 Revolving Credit Facility |  |
Subsequent Event [Line Items] |  |
Revolving credit facility, maximum borrowing capacity | $ 1,250.0 |

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- Definition Line of Credit Facility, Maximum Borrowing Capacity, Amount Terminated + References No definition available. + Details
Name: | lgfa_LineOfCreditFacilityMaximumBorrowingCapacityAmountTerminated
Namespace Prefix: | lgfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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