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Customer and Geographic Information (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2015 | Apr. 30, 2014
Major customer |  |  |  |
Revenues from External Customers |  |  |  |
Minimum percentage of consolidated net sales sold to one customer or individual country requiring additional and separate disclosure | 10.00%cmtl_MinimumPercentageOfConsolidatedNetSalesToOneCustomerOrIndividualCountryRequiringAdditionalDisclosure / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 10.00%cmtl_MinimumPercentageOfConsolidatedNetSalesToOneCustomerOrIndividualCountryRequiringAdditionalDisclosure / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 10.00%cmtl_MinimumPercentageOfConsolidatedNetSalesToOneCustomerOrIndividualCountryRequiringAdditionalDisclosure / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 10.00%cmtl_MinimumPercentageOfConsolidatedNetSalesToOneCustomerOrIndividualCountryRequiringAdditionalDisclosure / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember
U.S. government |  |  |  |
Revenues from External Customers |  |  |  |
Percentage of revenue generated from external customer type | 37.50%cmtl_EntityWideRevenuePercentageByMajorCustomerType / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_USGovernmentMember | 27.40%cmtl_EntityWideRevenuePercentageByMajorCustomerType / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_USGovernmentMember | 29.70%cmtl_EntityWideRevenuePercentageByMajorCustomerType / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_USGovernmentMember | 28.10%cmtl_EntityWideRevenuePercentageByMajorCustomerType / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_USGovernmentMember
Commercial (United States) |  |  |  |
Revenues from External Customers |  |  |  |
Percentage of revenue generated from external customer type | 11.90%cmtl_EntityWideRevenuePercentageByMajorCustomerType / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_CommercialMember | 10.30%cmtl_EntityWideRevenuePercentageByMajorCustomerType / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_CommercialMember | 12.50%cmtl_EntityWideRevenuePercentageByMajorCustomerType / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_CommercialMember | 12.90%cmtl_EntityWideRevenuePercentageByMajorCustomerType / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_CommercialMember
Total United States |  |  |  |
Revenues from External Customers |  |  |  |
Percentage of revenue generated from external customer type | 49.40%cmtl_EntityWideRevenuePercentageByMajorCustomerType / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_TotalUnitedStatesMember | 37.70%cmtl_EntityWideRevenuePercentageByMajorCustomerType / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_TotalUnitedStatesMember | 42.20%cmtl_EntityWideRevenuePercentageByMajorCustomerType / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_TotalUnitedStatesMember | 41.00%cmtl_EntityWideRevenuePercentageByMajorCustomerType / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_TotalUnitedStatesMember
North African country |  |  |  |
Revenues from External Customers |  |  |  |
Percentage of revenue generated from external customer type | 17.30%cmtl_EntityWideRevenuePercentageByMajorCustomerType / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_NorthAfricanCountryMember | 22.40%cmtl_EntityWideRevenuePercentageByMajorCustomerType / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_NorthAfricanCountryMember | 15.60%cmtl_EntityWideRevenuePercentageByMajorCustomerType / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_NorthAfricanCountryMember | 16.30%cmtl_EntityWideRevenuePercentageByMajorCustomerType / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_NorthAfricanCountryMember
Other international |  |  |  |
Revenues from External Customers |  |  |  |
Percentage of revenue generated from external customer type | 33.30%cmtl_EntityWideRevenuePercentageByMajorCustomerType / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_OtherInternationalMember | 39.90%cmtl_EntityWideRevenuePercentageByMajorCustomerType / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_OtherInternationalMember | 42.20%cmtl_EntityWideRevenuePercentageByMajorCustomerType / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_OtherInternationalMember | 42.70%cmtl_EntityWideRevenuePercentageByMajorCustomerType / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_OtherInternationalMember
Total International |  |  |  |
Revenues from External Customers |  |  |  |
Percentage of revenue generated from external customer type | 50.60%cmtl_EntityWideRevenuePercentageByMajorCustomerType / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_TotalInternationalSalesMember | 62.30%cmtl_EntityWideRevenuePercentageByMajorCustomerType / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_TotalInternationalSalesMember | 57.80%cmtl_EntityWideRevenuePercentageByMajorCustomerType / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_TotalInternationalSalesMember | 59.00%cmtl_EntityWideRevenuePercentageByMajorCustomerType / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_TotalInternationalSalesMember
Revenue generated from external customers | 36,243,000 us-gaap_Revenues / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_TotalInternationalSalesMember | 55,370,000 us-gaap_Revenues / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_TotalInternationalSalesMember | 132,767,000 us-gaap_Revenues / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_TotalInternationalSalesMember | 152,054,000 us-gaap_Revenues / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_TotalInternationalSalesMember
U.S. Prime Contractor | Major customer | Sales Revenue, Net |  |  |  |
Revenues from External Customers |  |  |  |
Percentage of revenue generated from external customer type | 17.00%cmtl_EntityWideRevenuePercentageByMajorCustomerType / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_U.S.PrimeContractorMember | 22.50%cmtl_EntityWideRevenuePercentageByMajorCustomerType / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_U.S.PrimeContractorMember | 15.20%cmtl_EntityWideRevenuePercentageByMajorCustomerType / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_U.S.PrimeContractorMember | 16.30%cmtl_EntityWideRevenuePercentageByMajorCustomerType / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / cmtl_RevenuePercentageByCustomerTypeAxis = cmtl_U.S.PrimeContractorMember

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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