Debt Instrument, Accrued Interest Period

No definition available.

Name:	ajx_DebtInstrumentAccruedInterestPeriod
Namespace Prefix:	ajx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the value of unpaid principal balance.

+ References

No definition available.

+ Details

Name:	ajx_DebtInstrumentUnpaidPrincipalBalance
Namespace Prefix:	ajx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Expected Gain (Loss) On Sale Of Financing Receivable

+ References

No definition available.

+ Details

Name:	ajx_ExpectedGainLossOnSaleOfFinancingReceivable
Namespace Prefix:	ajx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Expected Proceeds From Sale Of Financing Receivables

+ References

No definition available.

+ Details

Name:	ajx_ExpectedProceedsFromSaleOfFinancingReceivables
Namespace Prefix:	ajx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents amount of unpaid principal balance of mortgage loans.

+ References

No definition available.

+ Details

Name:	ajx_MortgageLoansOnRealEstateCommitmentsToPurchaseOrSellUnpaidPrincipalBalance
Namespace Prefix:	ajx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Mortgage Loans On Real Estate Commitments To Purchased Or Sold Unpaid Principal Balance

+ References

No definition available.

+ Details

Name:	ajx_MortgageLoansOnRealEstateCommitmentsToPurchasedOrSoldUnpaidPrincipalBalance
Namespace Prefix:	ajx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482913/230-10-50-3

+ Details

Name:	us-gaap_DividendsPayableAmountPerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of gain (loss) on sale of financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481326/860-20-50-5

+ Details

Name:	us-gaap_GainLossOnSaleOfNotesReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow associated with the sale of receivables arising from the financing of goods and services.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-12

+ Details

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

- Definition

Amount of cash outflow for short-term and long-term debt. Excludes payment of lease obligation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-15

+ Details

Name:	us-gaap_RepaymentsOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481674/830-30-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483399/855-10-50-2

+ Details

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

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_ConvertibleNotesPayableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ajx_AjaxMortgageLoanTrust2021BAndSeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_MortgagesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended
	Apr. 30, 2024	Apr. 30, 2024	May 03, 2024	Mar. 31, 2024	Dec. 31, 2023
Convertible notes payable
Subsequent Event [Line Items]
Unpaid principal balance				$ 103.5	$ 103.5
Subsequent event
Subsequent Event [Line Items]
Dividends payable (in dollars per share)			$ 0.06
Subsequent event \| Convertible notes payable
Subsequent Event [Line Items]
Repayments of debt	$ 103.5
Accrued interest period (in days)	15 days	15 days
Subsequent event \| Line of Credit
Subsequent Event [Line Items]
Gain (loss) on sale of financing receivable		$ (13.6)
Proceeds from sale of debt		20.1
Unpaid principal balance	$ 124.8	124.8
Subsequent event \| Ajax Mortgage Loan Trust 2021 B And Senior Notes \| Mortgage loans
Subsequent Event [Line Items]
Unpaid principal balance sold		92.2
Gain (loss) on sale of financing receivable		(10.1)
Proceeds from sale of debt		6.5
Unpaid principal balance to be sold		180.6
Expected proceeds from sale of financing receivables		47.1
Expected gain (loss) on sale of financing receivable		$ (21.8)