Percentage of adjustment of exercise price of warrants based on market value and newly issued price.

No definition available.

Name:	hyac_ClassOfWarrantOrRightAdjustmentOfExercisePriceOfWarrantsOrRightsPercentBasedOnMarketValueAndNewlyIssuedPrices
Namespace Prefix:	hyac_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of adjustment of redemption price of stock based on newly issued price.

+ References

No definition available.

+ Details

Name:	hyac_ClassOfWarrantOrRightAdjustmentOfExercisePriceOfWarrantsOrRightsPercentBasedOnMarketValueAndNewlyIssuedPrices2
Namespace Prefix:	hyac_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The minimum threshold period for exercise of warrants, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	hyac_ClassOfWarrantOrRightMinimumThresholdDaysForExerciseOfWarrants
Namespace Prefix:	hyac_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The minimum threshold period during which a written notice is required for redemption of warrants, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	hyac_ClassOfWarrantOrRightMinimumThresholdWrittenNoticePeriodForRedemptionOfWarrants
Namespace Prefix:	hyac_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Threshold number of specified consecutive trading days for stock price trigger considered for redemption of warrants.

+ References

No definition available.

+ Details

Name:	hyac_ClassOfWarrantOrRightRedemptionOfWarrantsOrRightsConsecutiveThresholdTradingDays
Namespace Prefix:	hyac_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Price of the entity's common stock which would be required to be attained to trigger the redemption of warrants.

+ References

No definition available.

+ Details

Name:	hyac_ClassOfWarrantOrRightRedemptionOfWarrantsOrRightsStockPriceTrigger
Namespace Prefix:	hyac_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Threshold number of specified trading days for stock price trigger considered for redemption of warrants.

+ References

No definition available.

+ Details

Name:	hyac_ClassOfWarrantOrRightRedemptionOfWarrantsOrRightsThresholdTradingDays
Namespace Prefix:	hyac_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Redemption price per share or per unit of warrants or rights outstanding.

+ References

No definition available.

+ Details

Name:	hyac_ClassOfWarrantOrRightRedemptionPriceOfWarrantsOrRights
Namespace Prefix:	hyac_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The threshold period for not to transfer, assign or sell any of the shares or warrants, after the completion of the initial business combination.

+ References

No definition available.

+ Details

Name:	hyac_ClassOfWarrantOrRightThresholdPeriodForNotToTransferAssignOrSellAnySharesOrWarrantsAfterCompletionOfInitialBusinessCombination
Namespace Prefix:	hyac_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The maximum threshold period for filing registration statement after business combinations, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	hyac_MaximumThresholdPeriodForFilingRegistrationStatementAfterBusinessCombinations
Namespace Prefix:	hyac_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The maximum threshold period for registration statement to become effective after business combination, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	hyac_MaximumThresholdPeriodForRegistrationStatementToBecomeEffectiveAfterBusinessCombination
Namespace Prefix:	hyac_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of gross proceeds on total equity proceeds.

+ References

No definition available.

+ Details

Name:	hyac_PercentageOfGrossProceedsOnTotalEquityProceed
Namespace Prefix:	hyac_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Redemption period.

+ References

No definition available.

+ Details

Name:	hyac_RedemptionPeriod
Namespace Prefix:	hyac_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The threshold trading period for volume weighted average price per share calculation on a day after the consummation of initial business combination.

+ References

No definition available.

+ Details

Name:	hyac_VolumeWeightedAveragePricePerShareAfterDayOnWhichInitialBusinessCombinationConsummated
Namespace Prefix:	hyac_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-3

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

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

- Definition

Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

+ References

No definition available.

+ Details

Name:	us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of warrants or rights outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

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

- Definition

Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_WarrantsAndRightsOutstandingTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_IPOMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=hyac_PublicWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=hyac_PrivatePlacementWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

SHAREHOLDERS' DEFICIT - Warrants (Details)	12 Months Ended
SHAREHOLDERS' DEFICIT - Warrants (Details)	Dec. 31, 2025 D $ / shares shares	Dec. 31, 2024 shares	Jul. 28, 2023 $ / shares shares
SHAREHOLDERS' DEFICIT
Warrants outstanding	11,898,800	11,898,800
Exercise price of warrants \| $ / shares	$ 11.5
Minimum threshold days for exercise of warrants	30 days
Expiration term	5 years
Maximum threshold period for filing registration statement after business combinations \| D	15
Maximum threshold period for registration statement to become effective after business combination \| D	60
Redemption price per public warrant (in dollars per share) \| $ / shares	$ 0.01
Minimum threshold written notice period for redemption of public warrants	30 days
Redemption period	30 days
Stock price trigger for redemption of public warrants (in dollars per share) \| $ / shares	$ 18
Threshold trading days for redemption of public warrants \| D	20
Threshold consecutive trading days for redemption of public warrants \| D	30
Initial Public Offering
SHAREHOLDERS' DEFICIT
Warrants outstanding	11,898,800
Class A Ordinary Shares
SHAREHOLDERS' DEFICIT
Number of shares issuable per warrant	1
Share price \| $ / shares	$ 9.2
Percentage of gross proceeds on total equity proceed	60.00%
Threshold trading period for volume weighted average price per share calculation on a day after the consummation of initial business combination	20 days
Adjustment of exercise price of warrants based on market value and newly issued price (as a percent)	115.00%
Adjustment of exercise price of warrants based on market value and newly issued price 2 (as a percent)	180.00%
Public warrant
SHAREHOLDERS' DEFICIT
Warrants outstanding	11,500,000	11,500,000
Public warrant \| Initial Public Offering
SHAREHOLDERS' DEFICIT
Warrants outstanding	11,500,000
Public warrant \| Class A Ordinary Shares \| Initial Public Offering
SHAREHOLDERS' DEFICIT
Number of shares issuable per warrant			1
Exercise price of warrants \| $ / shares			$ 11.5
Private Placement Warrants
SHAREHOLDERS' DEFICIT
Warrants outstanding	398,800	398,800
Threshold period for not to transferable, assignable or salable any of their shares or warrants after the completion of the initial business combination	30 days
Private Placement Warrants \| Initial Public Offering
SHAREHOLDERS' DEFICIT
Warrants outstanding	398,800