Name:	cmtl_ExcessIncomeTaxBenefitRecordedAsIncreaseToAdditionalPaidInCapital
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount of excess tax benefit that arises when compensation cost from non-qualified share-based compensation recognized on the entity's tax return exceeds compensation cost from equity-based compensation recognized in financial statements. Excess tax benefit increases net cash provided by financing activities.

No definition available.

Name:	cmtl_ExcessTaxBenefitFromExercisedShareBasedCompensationFinancingActivities
Namespace Prefix:	cmtl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Income Tax Benefits From Stock Based Awards [Abstract]

No definition available.

Name:	cmtl_IncomeTaxBenefitsFromStockBasedAwardsAbstract
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Net reduction to additional paid-in capital (APIC) and accumulated hypothetical tax benefits, primarily due to either: (i) net income tax shortfalls recognized from the settlement of stock-based awards; and or (ii) the reversal of unrealized deferred tax assets associated with certain vested equity-classified stock-based awards that expired during the period.

No definition available.

Name:	cmtl_NetReductionToAPICAndAccumulatedHypotheticalTaxBenefits
Namespace Prefix:	cmtl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Cumulative amount of net windfall (“excess”) tax benefits related to the settlement of shared based awards and which is recorded as a component of additional paid in capital. Such pool is available to offset future write offs of deferred tax assets that may result from actual realized tax benefits being less than the estimated tax benefits recognized at the time of expensing share based awards (“shortfalls”). Such pool can never be less than zero. If no pool exists, shortfalls are recognized as a component of income tax expense in the income statement.

No definition available.

Name:	cmtl_SharedBasedAwardsHypotheticalTaxBenefitAdditionalPaidInCapitalPool
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The tax benefit initially disclosed but not previously recognized on settled equity-classified stock-based awards vesting prior to the adoption of accounting standards that require us to expense stock-based awards

No definition available.

Name:	cmtl_TaxBenefitInitiallyDisclosedButNotRecognizedRelatedToStockBasedAwards
Namespace Prefix:	cmtl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The tax benefit initially recognized on settled stock-based awards vesting subsequent to the adoption of accounting standards that require us to expense stock-based awards.

No definition available.

Name:	cmtl_TaxBenefitInitiallyRecognizedRelatedToSettledStockBasedAwards
Namespace Prefix:	cmtl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (j)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901