XML 106 R95.htm IDEA: XBRL DOCUMENT
v3.25.3

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
Name: | atch_ContingentGuarantee
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
Name: | atch_ContingentGuaranteeRepaymentObligation
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
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration