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Contingencies - Narrative (Details) $ in Millions	Sep. 30, 2025 USD ($) loan case	Sep. 30, 2024 USD ($) loan
Loss Contingency [Abstract]
Accrued penalty	$ 27.7
Number of cases | case	5
Warranty repurchase demands unpaid principal balance	$ 35.7	$ 20.5
Warranty repurchase demands number of loans | loan	100	70

X

- Definition

Number Of Cases

+ References

No definition available.

+ Details

Name:	onit_NumberOfCases
Namespace Prefix:	onit_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the number of loans related to outstanding representation and warranty repurchase demands as of the end of the period.

+ References

No definition available.

+ Details

Name:	onit_WarrantyRepurchaseDemandsNumberOfLoans
Namespace Prefix:	onit_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents unpaid principal balance related to outstanding representation and warranty repurchase demands as of the end of the period.

+ References

No definition available.

+ Details

Name:	onit_WarrantyRepurchaseDemandsUnpaidPrincipalBalance
Namespace Prefix:	onit_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-10

+ Details

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