Class of Warrant or Right, Exercise Price of Warrants or Rights.

No definition available.

Name:	hcmau_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRight
Namespace Prefix:	hcmau_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum threshold written notice period for redemption of public warrants.

+ References

No definition available.

+ Details

Name:	hcmau_ClassOfWarrantOrRightMinimumThresholdWrittenNoticePeriodForRedemptionOfWarrants
Namespace Prefix:	hcmau_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Stock price trigger for redemption of public warrants.

+ References

No definition available.

+ Details

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Namespace Prefix:	hcmau_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Threshold consecutive trading days for redemption of public warrants.

+ References

No definition available.

+ Details

Name:	hcmau_ClassOfWarrantOrRightRedemptionOfWarrantsOrRightsThresholdConsecutiveTradingDays
Namespace Prefix:	hcmau_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Threshold trading days for redemption of public warrants.

+ References

No definition available.

+ Details

Name:	hcmau_ClassOfWarrantOrRightRedemptionOfWarrantsOrRightsThresholdTradingDays
Namespace Prefix:	hcmau_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Redemption price per public warrant.

+ References

No definition available.

+ Details

Name:	hcmau_ClassOfWarrantOrRightRedemptionPriceOfWarrantsOrRights
Namespace Prefix:	hcmau_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Numbe of trading days.

+ References

No definition available.

+ Details

Name:	hcmau_NumbeOfTradingDays
Namespace Prefix:	hcmau_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of business day.

+ References

No definition available.

+ Details

Name:	hcmau_NumberOfBusinessDay
Namespace Prefix:	hcmau_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of issued per unit.

+ References

No definition available.

+ Details

Name:	hcmau_NumberOfIssuedPerUnit
Namespace Prefix:	hcmau_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Represent the number of trading days for weighted average price for ordinary share.

+ References

No definition available.

+ Details

Name:	hcmau_NumberOfTradingDayForWeightedAveragePriceOfOrdinaryShares
Namespace Prefix:	hcmau_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Threshold number of days for not to transfer, assign or sell any of Private Placement Shares after the completion of the initial Business Combination.

+ References

No definition available.

+ Details

Name:	hcmau_ThresholdPeriodForNotToTransferAssignOrSellSharesOrWarrantsAfterTheCompletionOfInitialBusinessCombination
Namespace Prefix:	hcmau_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of units issued.

+ References

No definition available.

+ Details

Name:	hcmau_UnitsIssuedDuringPeriodSharesNewIssues
Namespace Prefix:	hcmau_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Definition

Warrant outstanding, period for warrants become exercisable after issuance.

+ References

No definition available.

+ Details

Name:	hcmau_WarrantOutstandingPeriodForWarrantsBecomeExercisableAfterIssuance
Namespace Prefix:	hcmau_
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 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-3

Reference 2: 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 3: 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

+ Details

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

- 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

+ Details

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

- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

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

- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

+ 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

+ Details

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

- Details

Name:	us-gaap_BusinessAcquisitionAxis=hcmau_BusinessCombinationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=hcmau_PublicWarrantsMember
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_SubsidiarySaleOfStockAxis=us-gaap_IPOMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

Initial Public Offering (Details) - USD ($)		6 Months Ended	9 Months Ended
Initial Public Offering (Details) - USD ($)	Aug. 04, 2025	Jun. 30, 2026	Dec. 31, 2025
Initial Public Offering [Line Items]
Number of units issued	$ 253,000,000
Exercisable warrant term	30 days
Number of issued per unit	1
Expire term	5 years
Number of trading days		10 days
Redemption price per public warrant		$ 0.01
Minimum threshold written notice period for redemption of public warrants		30 days
Threshold trading days for redemption of public warrants		20 days
Threshold consecutive trading days for redemption of public warrants		30 days
Business Combination [Member]
Initial Public Offering [Line Items]
Number of business day		20 days
Public Warrants [Member]
Initial Public Offering [Line Items]
Exercisable warrant term		5 years
Warrants outstanding		$ 8,433,333	$ 8,433,333
After completion initial business combination		30 days	30 days
Purchase of one ordinary shares		$ 11.5	$ 11.5
Class A Ordinary Shares [Member]
Initial Public Offering [Line Items]
Stock price per share	$ 10
Price per Share	$ 11.5
Number of issued per unit	1
After completion initial business combination		1 year
Stock price trigger for redemption of public warrants		$ 18
Number of trading days for weighted average price for ordinary share		10 days
Class A Ordinary Shares [Member] \| Business Combination [Member]
Initial Public Offering [Line Items]
Number of business day		60 days
Class A Ordinary Shares [Member] \| Public Warrants [Member]
Initial Public Offering [Line Items]
Purchase shares		1	1
Class A Ordinary Shares [Member] \| Public Warrants [Member] \| Business Combination [Member]
Initial Public Offering [Line Items]
Number of business day		60 days
IPO [Member]
Initial Public Offering [Line Items]
Number of units issued	$ 25,300,000
Stock price per share	$ 10
Over-Allotment Option [Member]
Initial Public Offering [Line Items]
Number of units issued	$ 3,300,000