Amount of notes purchased by the entity.

No definition available.

Name:	aurcu_AmountOfNotesPurchased
Namespace Prefix:	aurcu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the percent of discount calculated in Pre-money Equity Valuation.

+ References

No definition available.

+ Details

Name:	aurcu_PreferredStockConversionPricePercentOfDiscountToPreMoneyEquityValuation
Namespace Prefix:	aurcu_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the percent of discount calculated in Pre-money Equity Valuation.

+ References

No definition available.

+ Details

Name:	aurcu_PreferredStockConversionPricePreMoneyEquityValuationAmount
Namespace Prefix:	aurcu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of tangible or intangible assets, including a business or subsidiary of the acquirer transferred by the entity to the former owners of the acquiree. Excludes cash.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI https://asc.fasb.org/extlink&oid=126975305&loc=d3e6927-128479

+ Details

Name:	us-gaap_BusinessCombinationConsiderationTransferredOther1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21521-112644

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21506-112644

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(5))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644

+ Details

Name:	us-gaap_DebtInstrumentConvertibleConversionRatio1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash inflow from a borrowing supported by a written promise to pay an obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585

+ Details

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

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

- Details

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

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_SeriesDPreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=aurcu_IfProposedBusinessCombinationIsNotCompletedOnOrBeforeSeptember302023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=aurcu_BetterHoldcoInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=aurcu_BetterHoldcoInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=aurcu_BridgeNotePurchaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=aurcu_SponsorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=aurcu_SbNorthstarLpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

COMMITMENTS AND CONTINGENCIES - Pre-Closing Bridge Notes (Details)	Nov. 02, 2021 USD ($)	Feb. 11, 2021 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Subsequent event \| Series D Preferred Stock
COMMITMENTS AND CONTINGENCIES
Percent of discount			50.00%	50.00%
If the proposed Business Combination is not completed on or before September 30, 2023 \| Subsequent event \| Better HoldCo, Inc.
COMMITMENTS AND CONTINGENCIES
Percent of discount			75.00%
Amount of pre-money equity valuation			$ 6,900,000,000
If the proposed Business Combination is not completed on or before September 30, 2023 \| Subsequent event \| Better HoldCo, Inc. \| Class B ordinary shares
COMMITMENTS AND CONTINGENCIES
Percent of discount			75.00%	75.00%
Amount of pre-money equity valuation				$ 6,900,000,000
If the proposed Business Combination is not completed on or before September 30, 2023 \| Subsequent event \| Better HoldCo, Inc. \| Common Stock
COMMITMENTS AND CONTINGENCIES
Percent of discount			75.00%
Amount of pre-money equity valuation			$ 6,900,000,000	$ 6,900,000,000
If the proposed Business Combination is not completed on or before September 30, 2023 \| Subsequent event \| Better HoldCo, Inc. \| Common Stock \| Class B ordinary shares
COMMITMENTS AND CONTINGENCIES
Amount of pre-money equity valuation			6,900,000,000
If the proposed Business Combination is not completed on or before September 30, 2023 \| Better HoldCo, Inc. \| Subsequent event \| Class B ordinary shares
COMMITMENTS AND CONTINGENCIES
Amount of pre-money equity valuation			$ 6,900,000,000
Bridge Note Purchase Agreement \| Sponsor
COMMITMENTS AND CONTINGENCIES
Bridge notes purchased	$ 100,000,000	$ 100,000,000
Bridge Note Purchase Agreement \| SB Northstar LP
COMMITMENTS AND CONTINGENCIES
Bridge notes purchased	650,000,000	$ 650,000,000
Bridge Note Purchase Agreement \| Better HoldCo, Inc.
COMMITMENTS AND CONTINGENCIES
Conversion rate of bridge notes into Better Class A common stock		1
Consideration amount		$ 10
Bridge Note Purchase Agreement \| Better HoldCo, Inc.
COMMITMENTS AND CONTINGENCIES
Bridge notes issued	$ 750,000,000	$ 750,000,000
Conversion rate of bridge notes into Better Class A common stock	1
Consideration amount	$ 10