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Non-controlling Interests (Narrative) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Mar. 05, 2021
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Australian Country Cinemas, Pty Ltd [Member] |  |
Noncontrolling Interest [Line Items] |  |
Ownership percentage by noncontrolling interest | 25.00% |
Sutton Hill Properties, LLC [Member] |  |
Noncontrolling Interest [Line Items] |  |
Ownership percentage by noncontrolling interest | 25.00% |
Shadow View Land And Farming, LLC [Member] |  |
Noncontrolling Interest [Line Items] |  |
Proceeds from sale of subsidiary's share to our joint venture partner |  | $ 11.0
Ownership percentage by noncontrolling interest | 50.00% |
Sutton Hill Capital, LLC [Member] |  |
Noncontrolling Interest [Line Items] |  |
Ownership percentage by noncontrolling interest | 50.00% |

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- Definition Sale of subsidiary's share to our joint venture partner. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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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- Definition The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity. + References No definition available. + Details
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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: |
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- Details
Name: | srt_OwnershipAxis=rdi_ShadowViewLandAndFarmingLlcMember
Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |