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v2.4.1.9

Goodwill (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2015 operating_segment | Apr. 30, 2014 operating_segment | Apr. 30, 2015 operating_segment | Apr. 30, 2014 operating_segment | Jul. 31, 2014 operating_segment
Goodwill [Line Items] |  |  |  |  |
Number of reportable operating segments | 3 us-gaap_NumberOfOperatingSegments | 3 us-gaap_NumberOfOperatingSegments | 3 us-gaap_NumberOfOperatingSegments | 3 us-gaap_NumberOfOperatingSegments | 3 us-gaap_NumberOfOperatingSegments
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |
Goodwill gross | $ 150,603,000 us-gaap_GoodwillGross |  | $ 150,603,000 us-gaap_GoodwillGross |  | $ 150,603,000 us-gaap_GoodwillGross
Goodwill accumulated impairment | (13,249,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |  | (13,249,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |  | (13,249,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Goodwill | 137,354,000 us-gaap_Goodwill |  | 137,354,000 us-gaap_Goodwill |  | 137,354,000 us-gaap_Goodwill
Telecommunications Transmission Segment |  |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |
Goodwill gross | 107,779,000 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = cmtl_TelecommunicationsTransmissionSegmentMember |  | 107,779,000 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = cmtl_TelecommunicationsTransmissionSegmentMember |  | 107,779,000 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = cmtl_TelecommunicationsTransmissionSegmentMember
Goodwill accumulated impairment | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cmtl_TelecommunicationsTransmissionSegmentMember |  | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cmtl_TelecommunicationsTransmissionSegmentMember |  | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cmtl_TelecommunicationsTransmissionSegmentMember
Goodwill | 107,779,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cmtl_TelecommunicationsTransmissionSegmentMember |  | 107,779,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cmtl_TelecommunicationsTransmissionSegmentMember |  | 107,779,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cmtl_TelecommunicationsTransmissionSegmentMember
RF Microwave Amplifiers Segment |  |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |
Goodwill gross | 29,575,000 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = cmtl_RFMicrowaveAmplifiersSegmentMember |  | 29,575,000 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = cmtl_RFMicrowaveAmplifiersSegmentMember |  | 29,575,000 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = cmtl_RFMicrowaveAmplifiersSegmentMember
Goodwill accumulated impairment | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cmtl_RFMicrowaveAmplifiersSegmentMember |  | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cmtl_RFMicrowaveAmplifiersSegmentMember |  | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cmtl_RFMicrowaveAmplifiersSegmentMember
Goodwill | 29,575,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cmtl_RFMicrowaveAmplifiersSegmentMember |  | 29,575,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cmtl_RFMicrowaveAmplifiersSegmentMember |  | 29,575,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cmtl_RFMicrowaveAmplifiersSegmentMember
Mobile Data Communications Segment |  |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |
Goodwill gross | 13,249,000 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = cmtl_MobileDataCommunicationsSegmentMember |  | 13,249,000 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = cmtl_MobileDataCommunicationsSegmentMember |  | 13,249,000 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = cmtl_MobileDataCommunicationsSegmentMember
Goodwill accumulated impairment | (13,249,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cmtl_MobileDataCommunicationsSegmentMember |  | (13,249,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cmtl_MobileDataCommunicationsSegmentMember |  | (13,249,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cmtl_MobileDataCommunicationsSegmentMember
Goodwill | $ 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cmtl_MobileDataCommunicationsSegmentMember |  | $ 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cmtl_MobileDataCommunicationsSegmentMember |  | $ 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cmtl_MobileDataCommunicationsSegmentMember

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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