XML 113 R98.htm IDEA: XBRL DOCUMENT
v3.25.1

Derivative Financial Instruments and Hedging Activities - Narrative (Details) | 3 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025
Minimum |  |  |
Derivative [Line Items] |  |  |
Loans held-for-sale, period of sale | 5 days |  | 5 days
Minimum Hedge Coverage Ratio |  | 95.00% | 90.00%
Minimum | Forward loans IRLCs |  |  |
Derivative [Line Items] |  |  |
Loan commitment, term | 5 days |  |
Loan commitment, average term | 40 days |  |
Loan Commitment to Correspondents | 5 days |  |
Maximum |  |  |
Derivative [Line Items] |  |  |
Loans held-for-sale, period of sale | 30 days |  | 30 days
Minimum Hedge Coverage Ratio |  | 105.00% | 110.00%
Maximum | Forward loans IRLCs |  |  |
Derivative [Line Items] |  |  |
Loan commitment, term | 75 days |  |
Loan commitment, average term | 60 days |  |
Loan Commitment to Correspondents | 30 days |  |

X
- Definition Loan Commitment, Average Term + References No definition available. + Details
Name: | onit_LoanCommitmentAverageTerm
Namespace Prefix: | onit_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loan Commitment, Term + References No definition available. + Details
Name: | onit_LoanCommitmentTerm
Namespace Prefix: | onit_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition General Loan Commitment to Correspondents + References No definition available. + Details
Name: | onit_LoanCommitmentToCorrespondents
Namespace Prefix: | onit_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loans Held-for-sale, Period of Sale + References No definition available. + Details
Name: | onit_LoansHeldForSalePeriodOfSale
Namespace Prefix: | onit_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Minimum Hedge Coverage Ratio + References No definition available. + Details
Name: | onit_MinimumHedgeCoverageRatio
Namespace Prefix: | onit_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480237/815-40-50-5 + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateLockCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |