Commercial letters of credit outstanding amount

No definition available.

Name:	cmtl_CommercialLettersOfCreditOutstandingAmount
Namespace Prefix:	cmtl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

- 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

- 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

- Details

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

- 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

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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

- Details

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

Credit Facility (Details) (USD $)	3 Months Ended			6 Months Ended
Credit Facility (Details) (USD $)	Jan. 31, 2015	Oct. 31, 2014	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Uncommitted Secured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, maximum borrowing capacity	$ 15,000,000			$ 15,000,000
Line of Credit Facility, expiration date				Oct. 31, 2015
Outstanding standby letters of credit at period end	2,268,000			2,268,000
Outstanding commercial letters of credit at period end	0			0
Committed Secured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, maximum borrowing capacity		100,000,000
Line of Credit Facility, expiration date		Oct. 31, 2014
Interest expense related to Credit Facility	$ 0		$ 167,000	$ 198,000	$ 353,000