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Radyne Acquisition-Related Restructuring Plan - Details of Future Cash Payments (Details) (USD $) | Apr. 30, 2015 | Jul. 31, 2014 | Oct. 31, 2008 | Jul. 31, 2008
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Radyne Acquisition Related Restructuring Plan [Abstract] |  |  |  |
Future lease payments to be made in excess of anticipated sublease payments | $ 4,117,000 cmtl_BusinessAcquisitionRestructuringCostsFacilityRelatedExitCosts | $ 3,773,000 cmtl_BusinessAcquisitionRestructuringCostsFacilityRelatedExitCosts | $ 2,100,000 cmtl_BusinessAcquisitionRestructuringCostsFacilityRelatedExitCosts | $ 2,100,000 cmtl_BusinessAcquisitionRestructuringCostsFacilityRelatedExitCosts
Interest expense to be accreted in future periods | 751,000 cmtl_RestructuringAndRelatedCostsInterestToBeAccretedInFuturePeriods |  |  |
Total remaining net cash payments | $ 4,868,000 cmtl_RestructuringAndRelatedCostsTotalNetExpectedCostsToBePaidInFuturePeriods |  |  |

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- Definition Amount accrued to cover estimated present value of facility exit costs related to noncancellable lease obligations assumed in a business combination, net of the present value of estimated sublease income. + References No definition available. + Details
Name: | cmtl_BusinessAcquisitionRestructuringCostsFacilityRelatedExitCosts
Namespace Prefix: | cmtl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | cmtl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of interest to be accreted on facility-related exit costs in future periods. + References No definition available. + Details
Name: | cmtl_RestructuringAndRelatedCostsInterestToBeAccretedInFuturePeriods
Namespace Prefix: | cmtl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Total net amount expected to be paid in the future for the specified restructuring cost. + References No definition available. + Details
Name: | cmtl_RestructuringAndRelatedCostsTotalNetExpectedCostsToBePaidInFuturePeriods
Namespace Prefix: | cmtl_
Data Type: | xbrli:monetaryItemType
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