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FAIR VALUE MEASUREMENTS - Contingent Guarantee (Details) - USD ($)			1 Months Ended	3 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Feb. 09, 2024	Feb. 07, 2024	Jul. 31, 2024	Jun. 30, 2024	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2025	Jun. 30, 2023
FAIR VALUE MEASUREMENTS
Value of founder shares transferred to cover cash deficit		$ 4,000,000
Contingent guarantee				$ 3,256,863	$ 3,256,863			$ 3,256,863
Value of founder shares transferred	$ 4,000,000					$ 1,210,290
Value of shares issued as payment towards contingent guarantee			$ 1,210,290
Repayment obligation of contingent guarantee						2,886,347
Change in fair value, contingent guarantee				$ 3,256,863	$ 3,256,863	$ 839,775	$ 839,775

X

- Definition

Amount of contingent guarantee as a financial liability payable within the next twelve months.

+ References

No definition available.

+ Details

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Namespace Prefix:	atch_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of obligation for repayment relating to value of stock issued as a contingent guarantee.

+ References

No definition available.

+ Details

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Namespace Prefix:	atch_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of expense (income) related to adjustment to fair value of contingent guarantee.

+ References

No definition available.

+ Details

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

X

- Definition

The fair value of stock issued as payment towards contingent guarantee.

+ References

No definition available.

+ Details

Name:	atch_StockIssuedPaymentTowardsContingentGuarantee
Namespace Prefix:	atch_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The value of founder shares transferred.

+ References

No definition available.

+ Details

Name:	atch_ValueOfFounderSharesTransferred
Namespace Prefix:	atch_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The value of founder shares transferred to cover the cash deficit.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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