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Credit Facility (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Apr. 30, 2015 | Oct. 31, 2014 | Apr. 30, 2014 | Apr. 30, 2015 | Apr. 30, 2014
Uncommitted Secured Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, maximum borrowing capacity | $ 15,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = cmtl_UncommittedSecuredRevolvingCreditFacilityMember |  |  | $ 15,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = cmtl_UncommittedSecuredRevolvingCreditFacilityMember |
Line of Credit Facility, expiration date |  |  |  | Oct. 31, 2015 |
Outstanding standby letters of credit at period end | 3,233,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = cmtl_UncommittedSecuredRevolvingCreditFacilityMember |  |  | 3,233,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = cmtl_UncommittedSecuredRevolvingCreditFacilityMember |
Outstanding commercial letters of credit at period end | 0 cmtl_CommercialLettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = cmtl_UncommittedSecuredRevolvingCreditFacilityMember |  |  | 0 cmtl_CommercialLettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = cmtl_UncommittedSecuredRevolvingCreditFacilityMember |
Committed Secured Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, maximum borrowing capacity |  | 100,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = cmtl_CommittedSecuredRevolvingCreditFacilityMember |  |  |
Line of Credit Facility, expiration date |  | Oct. 31, 2014 |  |  |
Interest expense related to Credit Facility | $ 0 cmtl_CreditFacilityInterestExpenseForPeriod / us-gaap_CreditFacilityAxis = cmtl_CommittedSecuredRevolvingCreditFacilityMember |  | $ 157,000 cmtl_CreditFacilityInterestExpenseForPeriod / us-gaap_CreditFacilityAxis = cmtl_CommittedSecuredRevolvingCreditFacilityMember | $ 198,000 cmtl_CreditFacilityInterestExpenseForPeriod / us-gaap_CreditFacilityAxis = cmtl_CommittedSecuredRevolvingCreditFacilityMember | $ 510,000 cmtl_CreditFacilityInterestExpenseForPeriod / us-gaap_CreditFacilityAxis = cmtl_CommittedSecuredRevolvingCreditFacilityMember

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- Definition Commercial letters of credit outstanding amount + References No definition available. + Details
Name: | cmtl_CommercialLettersOfCreditOutstandingAmount
Namespace Prefix: | cmtl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Interest expense related to the credit facility for the period, including undrawn line fees and amortization of deferred financing costs. + References No definition available. + Details
Name: | cmtl_CreditFacilityInterestExpenseForPeriod
Namespace Prefix: | cmtl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_CreditFacilityAxis=cmtl_CommittedSecuredRevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=cmtl_UncommittedSecuredRevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |