Percentage of discount on debt instrument.

No definition available.

Name:	atch_DebtInstrumentDiscountPercentage
Namespace Prefix:	atch_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of base salary the executive is entitled to receive in year one.

+ References

No definition available.

+ Details

Name:	atch_EmploymentAgreementAnnualBaseSalaryYearOne
Namespace Prefix:	atch_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of base salary the executive is entitled to receive in year three.

+ References

No definition available.

+ Details

Name:	atch_EmploymentAgreementAnnualBaseSalaryYearThree
Namespace Prefix:	atch_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of base salary the executive is entitled to receive in year two.

+ References

No definition available.

+ Details

Name:	atch_EmploymentAgreementAnnualBaseSalaryYearTwo
Namespace Prefix:	atch_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The number of stock awards entitled for executives.

+ References

No definition available.

+ Details

Name:	atch_EmploymentAgreementNumberOfStockAwards
Namespace Prefix:	atch_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares to be granted.

+ References

No definition available.

+ Details

Name:	atch_EmploymentAgreementStockGrants
Namespace Prefix:	atch_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The initial term of employment, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	atch_EmploymentAgreementTermOfEmployment
Namespace Prefix:	atch_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The renewal term of employment, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	atch_EmploymentAgreementTermOfRenewal
Namespace Prefix:	atch_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The threshold period of written notice of non-renewal, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	atch_EmploymentAgreementThresholdPeriodOfWrittenNoticeOfNonRenewal
Namespace Prefix:	atch_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of minimum qualified cumulative financing.

+ References

No definition available.

+ Details

Name:	atch_MinimumQualifiedCumulativeFinancingAmount
Namespace Prefix:	atch_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The percentage of bonus payable.

+ References

No definition available.

+ Details

Name:	atch_PercentageOfBonusPayable
Namespace Prefix:	atch_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The percentage of the proceeds raised in excess of the threshold amount.

+ References

No definition available.

+ Details

Name:	atch_PercentageOfProceedsRaisedInExcessOfThresholdAmount
Namespace Prefix:	atch_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of threshold gross proceeds raised through qualified financing.

+ References

No definition available.

+ Details

Name:	atch_QualifiedFinancingThresholdGrossProceeds
Namespace Prefix:	atch_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The threshold amount raised from third party financing.

+ References

No definition available.

+ Details

Name:	atch_ThirdPartyFinancingThresholdAmount
Namespace Prefix:	atch_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The threshold percentage of outstanding shares for determining stock awards.

+ References

No definition available.

+ Details

Name:	atch_ThresholdPercentageOfOutstandingSharesForDeterminingStockAward
Namespace Prefix:	atch_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The threshold period to file registration statement for resale of the conversion shares.

+ References

No definition available.

+ Details

Name:	atch_ThresholdPeriodToFileRegistrationStatement
Namespace Prefix:	atch_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Threshold number of specified trading days over which the volume weighted average prices is considered for calculating stock trading price .

+ References

No definition available.

+ Details

Name:	atch_ThresholdTradingDaysOverWhichVolumeWeightedAverageStockPriceConsideredCalculatingStockTradingPrice
Namespace Prefix:	atch_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average price of stock.

+ References

No definition available.

+ Details

Name:	atch_WeightedAveragePrice
Namespace Prefix:	atch_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable for incentive compensation awarded to employees and directors or earned by them based on the terms of one or more relevant arrangements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(15)(5))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

+ Details

Name:	us-gaap_AccruedBonusesCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-5

+ Details

Name:	us-gaap_DebtInstrumentConvertibleConversionPrice1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 55
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482949/835-30-55-8

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481568/470-20-55-69B

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69C
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481568/470-20-55-69C

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482900/835-30-50-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-2

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(a)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-14

+ Details

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

- Definition

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

+ References

+ Details

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

- Definition

This element represents money paid in advance to protect the provider of a product or service, such as a lessor, against damage or nonpayment by the buyer or tenant (lessee) during the term of the agreement. Such damages may include physical damage to the property, theft of property, and other contractual breaches. Security deposits held may be interest or noninterest bearing.

+ References

No definition available.

+ Details

Name:	us-gaap_SecurityDepositLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
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_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

Name:	srt_StatementScenarioAxis=atch_PayableAtEndOfFourthQuarter2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=atch_PayableAtEndOfFirstQuarter2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	srt_StatementScenarioAxis=atch_GrantedOnJuly12026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

SUBSEQUENT EVENTS (Details)						6 Months Ended
SUBSEQUENT EVENTS (Details)	Sep. 24, 2025 USD ($) item D $ / shares	Sep. 23, 2025 USD ($)	Sep. 19, 2025 USD ($) item D $ / shares shares	Sep. 16, 2025 USD ($)	Aug. 04, 2025 USD ($) $ / shares	Jun. 30, 2024 USD ($)	Sep. 12, 2025 USD ($)
SUBSEQUENT EVENTS
Gross purchase price						$ 6,000,000
Subsequent Event
SUBSEQUENT EVENTS
Deposit							$ 100,000
Annual base salary, year one	$ 400,000
Annual base salary, year two	450,000
Annual base salary, year three	500,000
Cash signing bonus	$ 300,000
Subsequent Event \| John Schaible and Craig Ridenhour
SUBSEQUENT EVENTS
Term of employment			3 years
Renewal term			1 year
Threshold period of written notice of non renewal			60 days
Annual base salary, year one			$ 400,000
Annual base salary, year two			450,000
Annual base salary, year three			500,000
Cash signing bonus			300,000
Minimum qualified cumulative financing			$ 5,000,000
Number of stock awards \| item			5
Threshold percentage of outstanding shares for determining stock award			1.00%
Vesting period			3 years
Threshold trading days over which volume weighted average stock price considered calculating stock trading price \| D			10
Subsequent Event \| John Schaible and Craig Ridenhour \| Payable immediately
SUBSEQUENT EVENTS
Percentage of bonus payable			0.33%
Subsequent Event \| John Schaible and Craig Ridenhour \| Payable at the end of fourth quarter 2025
SUBSEQUENT EVENTS
Percentage of bonus payable			0.33%
Subsequent Event \| John Schaible and Craig Ridenhour \| Payable at the end of the first quarter 2026
SUBSEQUENT EVENTS
Percentage of bonus payable			0.33%
Subsequent Event \| John Schaible and Craig Ridenhour \| Granted on signing
SUBSEQUENT EVENTS
Stock grants \| shares			700,000
Subsequent Event \| John Schaible and Craig Ridenhour \| Granted on July 1, 2026
SUBSEQUENT EVENTS
Stock grants \| shares			286,842
Subsequent Event \| John Schaible and Craig Ridenhour \| Stock price milestone one
SUBSEQUENT EVENTS
Weighted average price \| $ / shares			$ 0.75
Subsequent Event \| John Schaible and Craig Ridenhour \| Stock price milestone two
SUBSEQUENT EVENTS
Weighted average price \| $ / shares			1
Subsequent Event \| John Schaible and Craig Ridenhour \| Stock price milestone three
SUBSEQUENT EVENTS
Weighted average price \| $ / shares			1.24
Subsequent Event \| John Schaible and Craig Ridenhour \| Stock price milestone four
SUBSEQUENT EVENTS
Weighted average price \| $ / shares			1.49
Subsequent Event \| John Schaible and Craig Ridenhour \| Stock price milestone five
SUBSEQUENT EVENTS
Weighted average price \| $ / shares			$ 1.74
Subsequent Event \| Sandip Patel
SUBSEQUENT EVENTS
Term of employment	3 years
Renewal term	1 year
Threshold period of written notice of non renewal	60 days
Annual base salary, year one	$ 350,000
Annual base salary, year two	400,000
Annual base salary, year three	450,000
Cash signing bonus	250,000
Minimum qualified cumulative financing	$ 5,000,000
Number of stock awards \| item	5
Threshold percentage of outstanding shares for determining stock award	0.50%
Vesting period	3 years
Threshold trading days over which volume weighted average stock price considered calculating stock trading price \| D	10
Subsequent Event \| Sandip Patel \| Payable immediately
SUBSEQUENT EVENTS
Percentage of bonus payable	0.33%
Subsequent Event \| Sandip Patel \| Payable at the end of fourth quarter 2025
SUBSEQUENT EVENTS
Percentage of bonus payable	0.33%
Subsequent Event \| Sandip Patel \| Payable at the end of the first quarter 2026
SUBSEQUENT EVENTS
Percentage of bonus payable	0.33%
Subsequent Event \| Sandip Patel \| Stock price milestone one
SUBSEQUENT EVENTS
Weighted average price \| $ / shares	$ 0.75
Subsequent Event \| Sandip Patel \| Stock price milestone two
SUBSEQUENT EVENTS
Weighted average price \| $ / shares	1
Subsequent Event \| Sandip Patel \| Stock price milestone three
SUBSEQUENT EVENTS
Weighted average price \| $ / shares	1.24
Subsequent Event \| Sandip Patel \| Stock price milestone four
SUBSEQUENT EVENTS
Weighted average price \| $ / shares	1.49
Subsequent Event \| Sandip Patel \| Stock price milestone five
SUBSEQUENT EVENTS
Weighted average price \| $ / shares	$ 1.74
Subsequent Event \| Series A convertible debentures
SUBSEQUENT EVENTS
Aggregate principal amount					$ 500,000
Gross purchase price					$ 490,000
Interest rate (in percent)					10.00%
Conversion price (in dollars per share) \| $ / shares					$ 0.15
Percentage of proceeds raised in excess of threshold amount					100.00%
Threshold amount					$ 10,000,000
Threshold period to file registration statement					60 days
Subsequent Event \| Convertible promissory notes
SUBSEQUENT EVENTS
Aggregate principal amount		$ 6,000,000	$ 6,000,000	$ 6,000,000
Purchase price of notes		$ 5,000,000	$ 5,000,000	$ 5,000,000
Debt discount percentage		20.00%	20.00%	20.00%
Qualified Financing, threshold gross proceeds				$ 10,000,000