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CONTINGENCIES (Details) $ in Thousands | Oct. 13, 2017 claim | Sep. 30, 2018 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |  |
Number of claims filed | claim | 1 |
Insurance settlement payable | $ |  | $ 1,995

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- Definition Insurance Settlements Payable + References No definition available. + Details
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Namespace Prefix: | ryn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The total number of new claims filed pertaining to a loss contingency during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 + Details
Name: | us-gaap_LossContingencyNewClaimsFiledNumber
Namespace Prefix: | us-gaap_
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Balance Type: | na
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