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Commitments And Contingencies (Details) - California Employment Litigation [Member] - USD ($) | Feb. 19, 2024 | May 18, 2023 | Jul. 13, 2021
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Commitments And Contingencies [Line Items] |  |  |
Settlement awarded |  | $ 1,351,000 | $ 4,000,000.0
Scenario, Forecast [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Settlement awarded | $ 1,351,000 |  |

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- Definition Commitments And Contingencies [Line Items] + References No definition available. + Details
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Namespace Prefix: | rdi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount awarded from other party in judgment or settlement of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmountAwardedFromOtherParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | srt_LitigationCaseAxis=rdi_EmploymentLitigationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |