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Radyne Acquisition-Related Restructuring Plan - Summary of Radyne Acquisition Related Restructuring Plan (Details) (USD $) | 3 Months Ended |  |  |
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Oct. 31, 2008 | Apr. 30, 2015 | Jul. 31, 2014 | Jul. 31, 2008
Radyne Acquisition Related Restructuring Plan [Abstract] |  |  |  |
Business acquisition restructuring costs | $ 2,713,000 cmtl_BusinessAcquisitionRestructuringCostTotalEstimatedCost |  |  |
Business acquisition restructuring costs related to severance for employees | 613,000 cmtl_BusinessAcquisitionRestructuringCostsSeveranceCosts |  |  |
Total non-cancelable lease obligations | 12,741,000 cmtl_BusinessAcquisitionRestructuringCostsTotalGrossNoncancellableLeaseObligationsRelatedToFacilityExitCosts |  |  |
Less: Estimated sublease income | 8,600,000 cmtl_BusinessAcquisitionRestructuringCostsGrossEstimatedSubleaseIncomeRelatedToFacilityExitCosts |  |  |
Total net estimated facility exit costs | 4,141,000 cmtl_RestructuringAndRelatedCostsTotalNetExpectedCost |  |  |
Less: Interest expense to be accreted | 2,041,000 cmtl_RestructuringAndRelatedCostsTotalInterestToBeAccreted |  |  |
Present value of estimated facility exit costs | $ 2,100,000 cmtl_BusinessAcquisitionRestructuringCostsFacilityRelatedExitCosts | $ 4,117,000 cmtl_BusinessAcquisitionRestructuringCostsFacilityRelatedExitCosts | $ 3,773,000 cmtl_BusinessAcquisitionRestructuringCostsFacilityRelatedExitCosts | $ 2,100,000 cmtl_BusinessAcquisitionRestructuringCostsFacilityRelatedExitCosts
Radyne lease expiration date | Oct. 31, 2018 |  |  |
Radyne sublease expiration date | Oct. 31, 2015 |  |  |

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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
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- Definition The total gross estimated sublease income associated with non-cancelable lease obligations assumed in a business combination and which relate to facility exit costs. + References No definition available. + Details
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- Definition Amount accrued to cover estimated severance costs related to a business combination. + References No definition available. + Details
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- Definition The total gross amount due under non-cancelable lease obligations assumed in a business combination and which relate to facility exit costs. + References No definition available. + Details
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- Definition Business Acquisition, Restructuring Cost, Total Estimated Cost + References No definition available. + Details
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- Definition Expiration date of the acquired Radyne non-cancelable leases. + References No definition available. + Details
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- Definition Expiration date of the acquired Radyne sublease. + References No definition available. + Details
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- Details
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- Definition The total amount of interest expense to be accreted on facility-related exit costs. + References No definition available. + Details
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- Definition Total net amount expected to be incurred for the specified restructuring cost. + References No definition available. + Details
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