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Accrued Expenses and Other Current Liabilities (Narrative) (Details)	12 Months Ended
	Jul. 31, 2024
Accrued Liabilities, Current [Abstract]
Minimum coverage period of product warranty from the date of shipment	1 year

X

- Definition

Minimum coverage period of product warranty from the date of shipment

+ References

No definition available.

+ Details

Name:	cmtl_MinimumCoveragePeriodOfProductWarrantyFromDateOfShipment
Namespace Prefix:	cmtl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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