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v3.25.1

Contingencies - Narrative (Details) $ in Millions | Mar. 31, 2025 USD ($) case loan | Mar. 31, 2024 USD ($) loan
--- | --- | ---
Loss Contingency [Abstract] |  |
Accrued penalty | $ 27.3 |
Number of cases | case | 5 |
Warranty repurchase demands unpaid principal balance | $ 25.5 | $ 25.3
Warranty repurchase demands number of loans | loan | 96 | 75

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- Definition Number Of Cases + References No definition available. + Details
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Namespace Prefix: | onit_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- 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
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Namespace Prefix: | onit_
Data Type: | xbrli:integerItemType
Balance Type: | na
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- 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
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Namespace Prefix: | onit_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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- 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
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