Debt amount under interest rate agreement.

No definition available.

Name:	rdi_DebtAmountUnderInterestRateAgreement
Namespace Prefix:	rdi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Interest rate collar transaction cap rate.

+ References

No definition available.

+ Details

Name:	rdi_InterestRateCollarTransactionCapRate
Namespace Prefix:	rdi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Interest rate collar transaction floor rate.

+ References

No definition available.

+ Details

Name:	rdi_InterestRateCollarTransactionFloorRate
Namespace Prefix:	rdi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- 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.

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+ Details

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

- Definition

Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

+ References

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+ Details

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

- Definition

Amount of the required periodic payments including both interest and principal payments.

+ References

+ Details

Name:	us-gaap_DebtInstrumentPeriodicPayment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=rdi_BankGuaranteeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rdi_NationalAustraliaBankGuaranteeFacilityMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

Borrowings (Australian NAB Corporate Term Loan (AU)) (Narrative) (Details) - AUD ($) $ in Millions	6 Months Ended
	Jun. 30, 2025	Apr. 02, 2025	Apr. 04, 2024
Bank Guarantee Facility [Member]
Debt Instrument [Line Items]
Line of credit	$ 3.0	$ 4.0
NAB Guarantee Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 20.0
Maturity date	Jul. 31, 2026
Australian NAB Corporate Loan Facility Tier 3 [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 100.0
Spread on variable interest rate	1.75%
Australian NAB Corporate Loan Facility Tier 3 [Member] \| Core Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 40.0
Australian NAB Corporate Loan Facility Tier 3 [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	60.0
Australian NAB Bank Guarantee Facility Tier 3 [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 5.0
Spread on variable interest rate	1.90%
Maturity date	Jul. 31, 2025
Debt amount under interest rate agreement	$ 50.0
Interest rate collar transaction floor rate	4.18%
Interest rate collar transaction cap rate	4.78%
Corporate Loan Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 100.0
Debt Instrument, Quarterly repayment	$ 1.5