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Strategic Funding (Details) - Schedule of Long-Term Loan to Cash Flow from Financing Activities - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Schedule of Long-Term Loan to Cash Flow from Financing Activities [Abstract] |  |
Balance at the beginning of year | $ 1,223 |
Balance at the end of year | 1,092 | 1,223
Long-term loans received | 888 | 1,667
Long-term loans payments (interest and principal) | (915) | (247)
Payments related to extinguishment of long-term loans | (134) |
Allocation of transaction costs to equity | (158) | (369)
Finance expenses, net | $ 188 | $ 172

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- Definition Represent the amount of costs to equity. + References No definition available. + Details
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Namespace Prefix: | alar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represent the amount of finance expenses. + References No definition available. + Details
Name: | alar_FinanceExpensesNet
Namespace Prefix: | alar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represent the amount of long-term loans payments (interest and principal). + References No definition available. + Details
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Namespace Prefix: | alar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Payments related to extinguishment of long-term loans. + References No definition available. + Details
Name: | alar_PaymentsRelatedToExtinguishmentOfLongtermLoans
Namespace Prefix: | alar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | alar_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of loans received. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard -URIDate 2023-03-23 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The non-current portion of non-current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant