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v3.20.2

Subsequent Events (Narrative) (Details) - Jul. 01, 2020 $ in Millions, $ in Millions | USD ($) | NZD ($)
--- | --- | ---
Westpac Bank Corporate Credit Facility [Member] | Subsequent Event [Member] |  |
Subsequent Event [Line Items] |  |
Cash transferred to a term deposit | $ 10.3 | $ 16.0

X
- Definition Cash Transferred To A Term Deposit + References No definition available. + Details
Name: | rdi_CashTransferredToTermDeposit
Namespace Prefix: | rdi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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

X
- Details
Name: | us-gaap_DebtInstrumentAxis=rdi_NewZealandCorporateCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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