Disposal Group, Including Discontinued Operation, Consideration, Equity Interests Received, Shares

No definition available.

Name:	ryam_DisposalGroupIncludingDiscontinuedOperationConsiderationEquityInterestsReceivedShares
Namespace Prefix:	ryam_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Disposal Group, Including Discontinued Operation, Consideration, Note Receivable

+ References

No definition available.

+ Details

Name:	ryam_DisposalGroupIncludingDiscontinuedOperationConsiderationNoteReceivable
Namespace Prefix:	ryam_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Disposal Group, Not Discontinued Operation, Sale of Common Shares

+ References

No definition available.

+ Details

Name:	ryam_DisposalGroupNotDiscontinuedOperationSaleOfCommonShares
Namespace Prefix:	ryam_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of cash inflow (outflow) from (to) the discontinued operation after the disposal transaction.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-URI https://asc.fasb.org/extlink&oid=109222650&loc=SL51721665-107760

+ Details

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

- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

+ Details

Name:	us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=ryam_LumberAndNewsprintFacilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DisposalGroupClassificationAxis=us-gaap_DiscontinuedOperationsDisposedOfBySaleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=ryam_GreenFirstMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Discontinued Operations - Narrative (Details) - Lumber and Newsprint Facilities - Discontinued Operations, Disposed of by Sale shares in Millions, $ in Millions, $ in Millions			3 Months Ended	6 Months Ended
	Aug. 28, 2021 USD ($) shares	Aug. 28, 2021 CAD ($) shares	Mar. 26, 2022 USD ($)	Jun. 25, 2022 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross purchase price	$ 232
Equity interests to be received (in shares) \| shares	28.7	28.7
Credit note to be issued, receivable	$ 5	$ 8
Net cash outflow from other adjustment settlements			$ 3
GreenFirst
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale of common shares				$ 43