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v3.26.1

Revenue Recognition - Capitalized Contract Cost (Details) - USD ($) | 3 Months Ended | 9 Months Ended
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Apr. 30, 2026 | Apr. 30, 2025 | Apr. 30, 2026 | Apr. 30, 2025
Revenue from Contract with Customer [Abstract] |  |  |  |
Costs to obtain a contract | $ 47,000 | $ 242,000 | $ 955,000 | $ 599,000
Costs to fulfill a contract | $ 409,000 | $ 763,000 | $ 514,000 | $ 2,717,000

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- Definition Capitalized Contract Cost, Amortization, Fulfilled + References No definition available. + Details
Name: | cmtl_CapitalizedContractCostAmortizationFulfilled
Namespace Prefix: | cmtl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Capitalized Contract Cost, Amortization, Obtained + References No definition available. + Details
Name: | cmtl_CapitalizedContractCostAmortizationObtained
Namespace Prefix: | cmtl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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