Operations In Foreign Currency (Narrative) (Details) $ in Millions	Sep. 30, 2017 USD ($)	Sep. 01, 2017 AUD ($)
Operations In Foreign Currency [Abstract]
Short-term intercompany loan	$ 825,000	$ 21.1

Intercompany Foreign Currency Balance, Amount For Short-Term

No definition available.

Name:	rdi_IntercompanyForeignCurrencyBalanceAmountForShortTerm
Namespace Prefix:	rdi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant