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Credit Facility (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2014 | Jan. 31, 2013
Line of Credit Facility [Line Items] |  |  |  |
Line of credit facility, amendment date |  |  | Dec. 06, 2013 |
Line of credit facility, expiration date |  |  | Oct. 31, 2014 |
Date the credit facility may be extended to |  |  | Dec. 31, 2016 |
Line of credit facility, maximum borrowing capacity | $ 100,000,000 |  | $ 100,000,000 |
Credit facility sub-limit for commercial letters of credit | 15,000,000 |  | 15,000,000 |
Credit facility sub-limit for standby letters of credit | 35,000,000 |  | 35,000,000 |
Outstanding revolving loans under the credit facility at period end | 0 |  | 0 |
Outstanding standby letters of credit at period end | 1,791,000 |  | 1,791,000 |
Outstanding commercial letters of credit at period end | 0 |  | 0 |
Minimum applicable interest rate margin over LIBOR at which the revolving credit facility may bear interest |  |  | 1.75% |
Maximum applicable interest rate margin over LIBOR at which the revolving credit facility may bear interest |  |  | 2.50% |
Basis points (expressed as a %) added to the Federal Funds Effective Rate to determine a base rate |  |  | 0.50% |
Basis points (expressed as a %) added to the daily floating interest rate to determine a base rate |  |  | 2.00% |
Minimum applicable interest rate margin over the base rate at which the credit facility may bear interest |  |  | 0.75% |
Maximum applicable interest rate margin over the base rate at which the credit facility may bear interest |  |  | 1.50% |
Amount an acquisition target purchase price must exceed in order for the target's historical EBITDA to be included when determining compliance with debt covenants | 10,000,000 |  | 10,000,000 |
Minimum level of total consolidated indebtedness, if maintained, that would not trigger a minimum level of Consolidated Adjusted EBITDA covenant requirement | 200,000,000 |  | 200,000,000 |
Line of Credit Facility, Interest Rate at Period End | 2.70% |  | 2.70% |
Interest expense related to credit facility | $ 167,000 | $ 184,000 | $ 353,000 | $ 363,000

X
- Definition Amount an acquisition target purchase price must exceed in order to provide for the target's historical EBITDA to be included when determining compliance with debt covenants + References No definition available. + Details
Name: | cmtl_AmountAcquisitionTargetPurchasePriceMustExceedInOrderToProvideForTargetsHistoricalEbitdaToBeIncludedWhenDeterminingComplianceWithDebtCovenants
Namespace Prefix: | cmtl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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

X
- Definition The number of basis points (expressed as a percentage) added to the daily floating interest rate to determine a base rate. + References No definition available. + Details
Name: | cmtl_CreditFacilityBasisPointsExpressedAsAPercentageAddedToDailyFloatingRateOfInterestToDetermineABaseRate
Namespace Prefix: | cmtl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of basis points (expressed as a percentage) added to the Federal Funds Effective Rate to determine a base rate. + References No definition available. + Details
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Namespace Prefix: | cmtl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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

X
- Definition The maximum amount of the revolving credit facility available for commercial letters of credit. + References No definition available. + Details
Name: | cmtl_CreditFacilityMaximumAmountOfRevolvingCreditFacilityAvailableForCommercialLettersOfCredit
Namespace Prefix: | cmtl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The maximum amount of the revolving credit facility available for standby letters of credit. + References No definition available. + Details
Name: | cmtl_CreditFacilityMaximumAmountOfRevolvingCreditFacilityAvailableForStandbyLettersOfCredit
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The maximum applicable interest rate margin over the base rate at which the revolving credit facility may bear interest. + References No definition available. + Details
Name: | cmtl_CreditFacilityMaximumInterestRateMarginOverBaseRate
Namespace Prefix: | cmtl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The maximum applicable margin over LIBOR at which the revolving credit facility may bear interest. + References No definition available. + Details
Name: | cmtl_CreditFacilityMaximumInterestRateMarginOverLibor
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- Definition The minimum applicable interest rate margin over the base rate at which the revolving credit facility may bear interest. + References No definition available. + Details
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Namespace Prefix: | cmtl_
Data Type: | num:percentItemType
Balance Type: | na
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X
- Definition The minimum applicable margin over LIBOR at which the revolving credit facility may bear interest. + References No definition available. + Details
Name: | cmtl_CreditFacilityMinimumInterestRateMarginOverLibor
Namespace Prefix: | cmtl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date that the credit facility was amended, in CCYY-MM-DD format + References No definition available. + Details
Name: | cmtl_LineofCreditFacilityAmendmentDate
Namespace Prefix: | cmtl_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Date the credit facility may be extended to at the company's option, subject to certain conditions, in CCYY-MM-DD format. + References No definition available. + Details
Name: | cmtl_LineOfCreditFacilityExtensionDateOption
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Balance Type: | na
Period Type: | duration

X
- Definition Minimum level of total consolidated indebtedness, if maintained, that would not trigger a minimum level of Consolidated Adjusted EBITDA covenant requirement + References No definition available. + Details
Name: | cmtl_MinimumLevelOfTotalConsolidatedIndebtednessIfMaintainedThatWouldNotTriggerAMinimumLevelOfConsolidatedAdjustedEBITDACovenantRequirement
Namespace Prefix: | cmtl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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X
- 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
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Period Type: | duration

X
- Definition The effective interest rate at the end of the reporting period. + 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
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- Details
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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 Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Period Type: | instant