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Accrued Expenses and Other Current Liabilities (Product Warranty Rollforward) (Details) - USD ($)	12 Months Ended
	Jul. 31, 2025	Jul. 31, 2024
Changes in Product Warranty Liability
Balance at beginning of year	$ 7,049,000	$ 8,285,000
Provision for warranty obligations	4,172,000	1,213,000
Adjustments for changes in estimates	0	(493,000)
Charges incurred	(2,746,000)	(1,538,000)
PST Divestiture	0	(418,000)
Balance at end of year	$ 8,475,000	$ 7,049,000

X

- Definition

Standard and Extended Product Warranty Accrual, Adjustments For Change In Estimates

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Definition

Standard and Extended Product Warranty Accrual, Increase (Decrease) for Reclassification of Accrued Warranty to Liabilities

+ References

No definition available.

+ Details

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Namespace Prefix:	cmtl_
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X

- Definition

Amount of increase (decrease) in the extended product warranty accrual from changes in estimates attributable to preexisting product warranties. Excludes standard product warranties.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (c)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-8

+ Details

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

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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X

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(20))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-8

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (c)(5)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-8

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
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X

- Definition

Amount of decrease in the standard and extended product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard and extended product warranty.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (c)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-8

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