GUARANTEES (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Guarantor Obligations [Line Items]
Maximum Potential Payment	$ 13,714
Carrying Amount of Associated Liability	43
Standby letters of credit
Guarantor Obligations [Line Items]
Maximum Potential Payment	10,176
Carrying Amount of Associated Liability	0
Letter of credit for development project	9,200
Guarantees
Guarantor Obligations [Line Items]
Maximum Potential Payment	2,254
Carrying Amount of Associated Liability	43
Surety bonds
Guarantor Obligations [Line Items]
Maximum Potential Payment	1,284
Carrying Amount of Associated Liability	$ 0

Letter Of Credit For Development Project

No definition available.

Name:	ryn_LetterOfCreditForDevelopmentProject
Namespace Prefix:	ryn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248

+ Details

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

- 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.

+ References

No definition available.

+ Details

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

- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

- Details

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- Details

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- Details

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