$CMTL
COMTECH TELECOMMUNICATIONS CORP /DE/ Stock $cmtl

$cmtl Overview Financials Valuation SEC Filings Company Website

2021 Q3 Form 10-K Financial Statement

#000002319721000082 Filed on October 04, 2021

Income Statement

Concept	2021 Q3	2021	2020 Q3
Revenue	$145.8M	$581.7M	$149.7M
YoY Change	-2.58%	-5.68%	-15.14%
Cost Of Revenue	$90.76M	$367.7M	$100.0M
YoY Change	-9.25%	-5.68%	-11.03%
Gross Profit	$55.05M	$214.0M	$49.66M
YoY Change	10.86%	-5.68%	-22.41%
Gross Profit Margin	37.76%	36.78%	33.18%
Selling, General & Admin	$27.80M	$111.8M	$23.60M
YoY Change	17.78%	-4.55%	-24.84%
% of Gross Profit	50.49%	52.25%	47.52%
Research & Development	$11.76M	$49.15M	$11.30M
YoY Change	4.04%	-5.81%	-28.03%
% of Gross Profit	21.36%	22.97%	22.75%
Depreciation & Amortization	$7.445M	$9.343M	$8.200M
YoY Change	-9.21%	-10.04%	-3.53%
% of Gross Profit	13.52%	4.37%	16.51%
Operating Expenses	$44.90M	$282.3M	$40.50M
YoY Change	10.87%	33.35%	-22.56%
Operating Profit	$10.15M	-$68.30M	$9.163M
YoY Change	10.78%	-550.1%	-21.75%
Interest Expense	-$1.588M	$6.821M	-$900.0K
YoY Change	76.44%	12.67%	-59.09%
% of Operating Profit	-15.64%		-9.82%
Other Income/Expense, Net	-$137.0K	$139.0K	$200.0K
YoY Change	-168.5%	-26.84%
Pretax Income	$7.941M	-$74.98M	$1.900M
YoY Change	317.95%	-905.37%	-76.83%
Income Tax	$578.0K	-$1.500M	$800.0K
% Of Pretax Income	7.28%		42.11%
Net Earnings	$7.363M	-$73.48M	$1.126M
YoY Change	553.91%	-1146.72%	-81.65%
Net Earnings / Revenue	5.05%	-12.63%	0.75%
Basic Earnings Per Share		-$2.86
Diluted Earnings Per Share	$0.28	-$2.86	$0.04
COMMON SHARES
Basic Shares Outstanding	26.34M shares	25.69M shares	24.99M shares
Diluted Shares Outstanding		25.69M shares

Balance Sheet

Concept	2021 Q3	2021	2020 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$30.86M	$30.86M	$47.90M
YoY Change	-35.57%	-35.57%	5.04%
Cash & Equivalents	$30.86M	$30.86M	$47.88M
Short-Term Investments
Other Short-Term Assets	$18.17M	$18.17M	$20.10M
YoY Change	-9.62%	-9.62%	34.9%
Inventory	$80.36M	$80.36M	$82.30M
Prepaid Expenses
Receivables	$158.1M	$158.1M	$126.8M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$287.5M	$287.5M	$277.1M
YoY Change	3.75%	3.75%	-1.15%
LONG-TERM ASSETS
Property, Plant & Equipment	$35.29M	$79.77M	$27.04M
YoY Change	30.51%	39.71%	-3.53%
Goodwill	$347.7M		$330.5M
YoY Change	5.2%		6.45%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$7.622M	$9.446M	$4.551M
YoY Change	67.48%	36.9%	17.78%
Total Long-Term Assets	$705.6M	$705.6M	$652.6M
YoY Change	8.13%	8.14%	7.43%
TOTAL ASSETS
Total Short-Term Assets	$287.5M	$287.5M	$277.1M
Total Long-Term Assets	$705.6M	$705.6M	$652.6M
Total Assets	$993.1M	$993.1M	$929.6M
YoY Change	6.83%	6.83%	4.72%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$36.19M	$36.19M	$23.42M
YoY Change	54.52%	54.67%	-3.73%
Accrued Expenses	$89.60M	$98.64M	$85.16M
YoY Change	5.21%	5.49%	8.37%
Deferred Revenue	$66.13M		$40.25M
YoY Change	64.3%		4.05%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due			$100.0K
YoY Change
Total Short-Term Liabilities	$203.6M	$203.6M	$159.7M
YoY Change	27.46%	27.46%	9.88%
LONG-TERM LIABILITIES
Long-Term Debt	$201.0M	$201.0M	$149.5M
YoY Change	34.45%	34.45%	-9.39%
Other Long-Term Liabilities	$14.51M	$66.60M	$17.83M
YoY Change	-18.64%	24.49%	-5.27%
Total Long-Term Liabilities	$215.5M	$267.6M	$167.3M
YoY Change	28.79%	31.82%	-8.97%
TOTAL LIABILITIES
Total Short-Term Liabilities	$203.6M	$203.6M	$159.7M
Total Long-Term Liabilities	$215.5M	$267.6M	$167.3M
Total Liabilities	$492.4M	$492.4M	$380.3M
YoY Change	29.46%	29.47%	7.86%
SHAREHOLDERS EQUITY
Retained Earnings	$333.0M		$417.3M
YoY Change	-20.19%		-0.73%
Common Stock	$4.128M		$3.992M
YoY Change	3.41%		1.63%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$441.8M		$441.8M
YoY Change	0.0%		0.0%
Treasury Stock Shares	15.03M shares		15.03M shares
Shareholders Equity	$500.7M	$500.7M	$549.3M
YoY Change
Total Liabilities & Shareholders Equity	$993.1M	$993.1M	$929.6M
YoY Change	6.83%	6.83%	4.72%

Cashflow Statement

Concept	2021 Q3	2021	2020 Q3
OPERATING ACTIVITIES
Net Income	$7.363M	-$73.48M	$1.126M
YoY Change	553.91%	-1146.72%	-81.65%
Depreciation, Depletion And Amortization	$7.445M	$9.343M	$8.200M
YoY Change	-9.21%	-10.04%	-3.53%
Cash From Operating Activities	$15.94M	-$40.64M	$13.80M
YoY Change	15.54%	-177.02%	-2.82%
INVESTING ACTIVITIES
Capital Expenditures	-$7.800M	$16.04M	-$2.800M
YoY Change	178.57%	121.97%	16.67%
Acquisitions
YoY Change
Other Investing Activities	-$77.00K	$554.0K	-$1.100M
YoY Change	-93.0%	-104.26%
Cash From Investing Activities	-$7.877M	-$15.48M	-$3.800M
YoY Change	107.29%	-23.29%	58.33%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net		$0.00
YoY Change
Cash From Financing Activities	-16.40M	$39.10M	-12.70M
YoY Change	29.17%	-229.15%	11.4%
NET CHANGE
Cash From Operating Activities	15.94M	-$40.64M	13.80M
Cash From Investing Activities	-7.877M	-$15.48M	-3.800M
Cash From Financing Activities	-16.40M	$39.10M	-12.70M
Net Change In Cash	-8.337M	-$17.02M	-2.700M
YoY Change	208.78%	-839.23%	-775.0%
FREE CASH FLOW
Cash From Operating Activities	$15.94M	-$40.64M	$13.80M
Capital Expenditures	-$7.800M	$16.04M	-$2.800M
Free Cash Flow	$23.74M	-$56.68M	$16.60M
YoY Change	43.04%	-224.45%	0.0%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2021	dei	Document Type DocumentType	10-K
CY2021	dei	Amendment Flag AmendmentFlag	false
CY2021	dei	Document Period End Date DocumentPeriodEndDate	2021-07-31
CY2021	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--07-31
CY2021	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2021	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
CY2021	dei	Entity Registrant Name EntityRegistrantName	COMTECH TELECOMMUNICATIONS CORP /DE/
CY2021	dei	Entity Central Index Key EntityCentralIndexKey	0000023197
CY2021Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P24M
CY2021	dei	Document Type DocumentType	10-K
CY2021	dei	Document Annual Report DocumentAnnualReport	true
CY2021	dei	Document Transition Report DocumentTransitionReport	false
CY2021	dei	Entity File Number EntityFileNumber	0-7928
CY2021	dei	Entity Shell Company EntityShellCompany	false
CY2021	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2021	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	11-2139466
CY2021	dei	Entity Address Address Line1 EntityAddressAddressLine1	68 South Service Road
CY2021	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 230
CY2021	dei	Entity Address City Or Town EntityAddressCityOrTown	Melville
CY2021	dei	Entity Address State Or Province EntityAddressStateOrProvince	NY
CY2021	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	11747
CY2021	dei	City Area Code CityAreaCode	(631)
CY2021	dei	Local Phone Number LocalPhoneNumber	962-7000
CY2021	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2021	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2021	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2021	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2021	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
CY2021	dei	Entity Small Business EntitySmallBusiness	false
CY2021	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2021	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2021Q1	dei	Entity Public Float EntityPublicFloat	523931000	USD
CY2021Q3	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	26335695	shares
CY2021Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	30861000	USD
CY2020Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	47878000	USD
CY2021Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	158110000	USD
CY2020Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	126816000	USD
CY2021Q3	us-gaap	Inventory Net InventoryNet	80358000	USD
CY2020Q3	us-gaap	Inventory Net InventoryNet	82302000	USD
CY2021Q3	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	18167000	USD
CY2020Q3	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	20101000	USD
CY2021Q3	us-gaap	Assets Current AssetsCurrent	287496000	USD
CY2020Q3	us-gaap	Assets Current AssetsCurrent	277097000	USD
CY2021Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	35286000	USD
CY2020Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	27037000	USD
CY2021Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	44486000	USD
CY2020Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	30033000	USD
CY2021Q3	us-gaap	Goodwill Goodwill	347698000	USD
CY2020Q3	us-gaap	Goodwill Goodwill	330519000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	268699000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	258019000	USD
CY2021Q3	us-gaap	Deferred Finance Costs Noncurrent Net DeferredFinanceCostsNoncurrentNet	1824000	USD
CY2020Q3	us-gaap	Deferred Finance Costs Noncurrent Net DeferredFinanceCostsNoncurrentNet	2391000	USD
CY2021Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	7622000	USD
CY2020Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	4551000	USD
CY2021Q3	us-gaap	Assets Assets	993111000	USD
CY2020Q3	us-gaap	Assets Assets	929647000	USD
CY2021Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	36193000	USD
CY2020Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	23423000	USD
CY2021Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	89601000	USD
CY2020Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	85161000	USD
CY2021Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	8841000	USD
CY2020Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	8247000	USD
CY2021Q3	us-gaap	Dividends Payable Current DividendsPayableCurrent	2601000	USD
CY2020Q3	us-gaap	Dividends Payable Current DividendsPayableCurrent	2468000	USD
CY2021Q3	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	66130000	USD
CY2020Q3	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	40250000	USD
CY2021Q3	us-gaap	Interest Payable Current InterestPayableCurrent	195000	USD
CY2020Q3	us-gaap	Interest Payable Current InterestPayableCurrent	163000	USD
CY2021Q3	us-gaap	Liabilities Current LiabilitiesCurrent	203561000	USD
CY2020Q3	us-gaap	Liabilities Current LiabilitiesCurrent	159712000	USD
CY2021Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	201000000	USD
CY2020Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	149500000	USD
CY2021Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	39569000	USD
CY2020Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	24109000	USD
CY2021Q3	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	2717000	USD
CY2020Q3	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	1963000	USD
CY2021Q3	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	21230000	USD
CY2020Q3	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	17637000	USD
CY2021Q3	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	9808000	USD
CY2020Q3	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	9596000	USD
CY2021Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	14507000	USD
CY2020Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	17831000	USD
CY2021Q3	us-gaap	Liabilities Liabilities	492392000	USD
CY2020Q3	us-gaap	Liabilities Liabilities	380348000	USD
CY2021Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q3	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.10
CY2021Q3	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.10
CY2021Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2020Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2021Q3	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2020Q3	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2021Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.10
CY2020Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.10
CY2021Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2020Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2021Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	41281812	shares
CY2020Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	39924439	shares
CY2021Q3	us-gaap	Common Stock Value CommonStockValue	4128000	USD
CY2020Q3	us-gaap	Common Stock Value CommonStockValue	3992000	USD
CY2021Q3	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	605439000	USD
CY2020Q3	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	569891000	USD
CY2021Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	333001000	USD
CY2020Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	417265000	USD
CY2021Q3	us-gaap	Stockholders Equity Before Treasury Stock StockholdersEquityBeforeTreasuryStock	942568000	USD
CY2020Q3	us-gaap	Stockholders Equity Before Treasury Stock StockholdersEquityBeforeTreasuryStock	991148000	USD
CY2020Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	15033317	shares
CY2021Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	15033317	shares
CY2021Q3	us-gaap	Treasury Stock Value TreasuryStockValue	441849000	USD
CY2020Q3	us-gaap	Treasury Stock Value TreasuryStockValue	441849000	USD
CY2021Q3	us-gaap	Stockholders Equity StockholdersEquity	500719000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	549299000	USD
CY2021Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	993111000	USD
CY2020Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	929647000	USD
CY2021	us-gaap	Revenues Revenues	581695000	USD
CY2020	us-gaap	Revenues Revenues	616715000	USD
CY2019	us-gaap	Revenues Revenues	671797000	USD
CY2021	us-gaap	Cost Of Revenue CostOfRevenue	367737000	USD
CY2020	us-gaap	Cost Of Revenue CostOfRevenue	389882000	USD
CY2019	us-gaap	Cost Of Revenue CostOfRevenue	424357000	USD
CY2021	us-gaap	Gross Profit GrossProfit	213958000	USD
CY2020	us-gaap	Gross Profit GrossProfit	226833000	USD
CY2019	us-gaap	Gross Profit GrossProfit	247440000	USD
CY2021	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	111796000	USD
CY2020	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	117130000	USD
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	128639000	USD
CY2021	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	49148000	USD
CY2020	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	52180000	USD
CY2019	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	56407000	USD
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	21020000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	21595000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	18320000	USD
CY2021	cmtl	Settlement Of Intellectual Property Litigation SettlementOfIntellectualPropertyLitigation	0	USD
CY2020	cmtl	Settlement Of Intellectual Property Litigation SettlementOfIntellectualPropertyLitigation	0	USD
CY2019	cmtl	Settlement Of Intellectual Property Litigation SettlementOfIntellectualPropertyLitigation	3204000	USD
CY2021	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	100292000	USD
CY2020	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	20754000	USD
CY2019	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	5871000	USD
CY2021	us-gaap	Operating Expenses OperatingExpenses	282256000	USD
CY2020	us-gaap	Operating Expenses OperatingExpenses	211659000	USD
CY2019	us-gaap	Operating Expenses OperatingExpenses	206033000	USD
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	-68298000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	15174000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	41407000	USD
CY2021	us-gaap	Interest Expense InterestExpense	6821000	USD
CY2020	us-gaap	Interest Expense InterestExpense	6054000	USD
CY2019	us-gaap	Interest Expense InterestExpense	9245000	USD
CY2021	us-gaap	Write Off Of Deferred Debt Issuance Cost WriteOffOfDeferredDebtIssuanceCost	0	USD
CY2020	us-gaap	Write Off Of Deferred Debt Issuance Cost WriteOffOfDeferredDebtIssuanceCost	0	USD
CY2019	us-gaap	Write Off Of Deferred Debt Issuance Cost WriteOffOfDeferredDebtIssuanceCost	3217000	USD
CY2021	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	139000	USD
CY2020	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	190000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-35000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-74980000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	9310000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	28910000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-1500000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2290000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3869000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	-73480000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	7020000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	25041000	USD
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-2.86
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.28
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.04
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-2.86
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.28
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.03
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CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	24124000	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	25685000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	24899000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	24302000	shares
CY2018Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	505684000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	11427000	USD
CY2019	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	216000	USD
CY2019	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	926000	USD
CY2019	us-gaap	Stock Issued During Period Value Restricted Stock Award Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	0	USD
CY2019	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	3916000	USD
CY2019	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	5606000	USD
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.40
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	9575000	USD
CY2019	cmtl	Dividend Equivalent Per Share Declared DividendEquivalentPerShareDeclared	0.40
CY2019	us-gaap	Dividends Share Based Compensation Cash DividendsShareBasedCompensationCash	327000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	25041000	USD
CY2019Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	535082000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	9275000	USD
CY2020	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	468000	USD
CY2020	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	855000	USD
CY2020	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	USD
CY2020	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	4888000	USD
CY2020	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	11575000	USD
CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.40
CY2020	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	9794000	USD
CY2020	cmtl	Dividend Equivalent Per Share Declared DividendEquivalentPerShareDeclared	0.40
CY2020	us-gaap	Dividends Share Based Compensation Cash DividendsShareBasedCompensationCash	294000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	7020000	USD
CY2020Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	549299000	USD
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	9983000	USD
CY2021	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	809000	USD
CY2021	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	USD
CY2021	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	4000000	USD
CY2021	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	28892000	USD
CY2021	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.40
CY2021	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	10189000	USD
CY2021	cmtl	Dividend Equivalent Per Share Declared DividendEquivalentPerShareDeclared	0.40
CY2021	us-gaap	Dividends Share Based Compensation Cash DividendsShareBasedCompensationCash	380000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	-73480000	USD
CY2021Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	500719000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	-73480000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	7020000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	25041000	USD
CY2021	us-gaap	Depreciation And Amortization DepreciationAndAmortization	9379000	USD
CY2020	us-gaap	Depreciation And Amortization DepreciationAndAmortization	10561000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	11927000	USD
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	21020000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	21595000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	18320000	USD
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	9983000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	9275000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	11427000	USD
CY2021	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	736000	USD
CY2020	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	737000	USD
CY2019	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	1099000	USD
CY2021	cmtl	Contract Settlement Costs ContractSettlementCosts	0	USD
CY2020	cmtl	Contract Settlement Costs ContractSettlementCosts	444000	USD
CY2019	cmtl	Contract Settlement Costs ContractSettlementCosts	6351000	USD
CY2021	us-gaap	Write Off Of Deferred Debt Issuance Cost WriteOffOfDeferredDebtIssuanceCost	0	USD
CY2020	us-gaap	Write Off Of Deferred Debt Issuance Cost WriteOffOfDeferredDebtIssuanceCost	0	USD
CY2019	us-gaap	Write Off Of Deferred Debt Issuance Cost WriteOffOfDeferredDebtIssuanceCost	3217000	USD
CY2021	cmtl	Settlement Of Intellectual Property Litigation SettlementOfIntellectualPropertyLitigation	0	USD
CY2020	cmtl	Settlement Of Intellectual Property Litigation SettlementOfIntellectualPropertyLitigation	0	USD
CY2019	cmtl	Settlement Of Intellectual Property Litigation SettlementOfIntellectualPropertyLitigation	3204000	USD
CY2021	cmtl	Business Combination Change In Fair Value Of Contingent Liability BusinessCombinationChangeInFairValueOfContingentLiability	-6633000	USD
CY2020	cmtl	Business Combination Change In Fair Value Of Contingent Liability BusinessCombinationChangeInFairValueOfContingentLiability	-4133000	USD
CY2019	cmtl	Business Combination Change In Fair Value Of Contingent Liability BusinessCombinationChangeInFairValueOfContingentLiability	-1056000	USD
CY2021	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-215000	USD
CY2020	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	0	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-144000	USD
CY2021	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	-18000	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	-431000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1136000	USD
CY2021	us-gaap	Inventory Write Down InventoryWriteDown	4364000	USD
CY2020	us-gaap	Inventory Write Down InventoryWriteDown	1647000	USD
CY2019	us-gaap	Inventory Write Down InventoryWriteDown	6015000	USD
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-3263000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	860000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	4283000	USD
CY2021	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-225000	USD
CY2020	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	0	USD
CY2019	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	0	USD
CY2021	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	31223000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-20929000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-6315000	USD
CY2021	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	2338000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	9132000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	3787000	USD
CY2021	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	265000	USD
CY2020	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	2261000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-915000	USD
CY2021	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	4215000	USD
CY2020	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	719000	USD
CY2019	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	-102000	USD
CY2021	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	11016000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-2206000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-21290000	USD
CY2021	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	-7886000	USD
CY2020	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	4292000	USD
CY2019	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	3554000	USD
CY2021	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	25444000	USD
CY2020	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-6312000	USD
CY2019	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-127000	USD
CY2021	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	3583000	USD
CY2020	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	2422000	USD
CY2019	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-84000	USD
CY2021	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	32000	USD
CY2020	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-397000	USD
CY2019	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	151000	USD
CY2021	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	3136000	USD
CY2020	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-1427000	USD
CY2019	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-2418000	USD
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-40638000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	52764000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	68031000	USD
CY2021	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	1304000	USD
CY2020	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	0	USD
CY2019	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	0	USD
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	16037000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	7225000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	8785000	USD
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-15483000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-20184000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-44668000	USD
CY2021	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	51500000	USD
CY2020	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	15500000	USD
CY2019	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	165000000	USD
CY2021	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	0	USD
CY2020	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	0	USD
CY2019	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	48603000	USD
CY2021	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	0	USD
CY2020	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	0	USD
CY2019	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	120121000	USD
CY2021	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	2803000	USD
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	5276000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	5042000	USD
CY2021	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	10334000	USD
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	10020000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	9789000	USD
CY2021	us-gaap	Repayments Of Debt And Capital Lease Obligations RepaymentsOfDebtAndCapitalLeaseObligations	38000	USD
CY2020	us-gaap	Repayments Of Debt And Capital Lease Obligations RepaymentsOfDebtAndCapitalLeaseObligations	805000	USD
CY2019	us-gaap	Repayments Of Debt And Capital Lease Obligations RepaymentsOfDebtAndCapitalLeaseObligations	1906000	USD
CY2021	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	30000	USD
CY2020	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	1813000	USD
CY2021	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	809000	USD
CY2020	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	855000	USD
CY2019	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	935000	USD
CY2021	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	0	USD
CY2020	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	468000	USD
CY2019	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	216000	USD
CY2021	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	0	USD
CY2020	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	0	USD
CY2019	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	148000	USD
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	39104000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-30278000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	45576000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-21271000	USD
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-17017000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	2302000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	2092000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	47878000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	43484000	USD
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	30861000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	47878000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	45576000	USD
CY2021	us-gaap	Interest Paid Net InterestPaidNet	5987000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	5549000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	7669000	USD
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-1373000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2875000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2005000	USD
CY2021	cmtl	Reclass Of Finance Lease Right Of Use Assets To Property Plant And Equipment ReclassOfFinanceLeaseRightOfUseAssetsToPropertyPlantAndEquipment	0	USD
CY2020	cmtl	Reclass Of Finance Lease Right Of Use Assets To Property Plant And Equipment ReclassOfFinanceLeaseRightOfUseAssetsToPropertyPlantAndEquipment	698000	USD
CY2019	cmtl	Reclass Of Finance Lease Right Of Use Assets To Property Plant And Equipment ReclassOfFinanceLeaseRightOfUseAssetsToPropertyPlantAndEquipment	0	USD
CY2021	cmtl	Accrual Related To Tax Withholding For Sharebased Compensation AccrualRelatedToTaxWithholdingForSharebasedCompensation	2596000	USD
CY2020	cmtl	Accrual Related To Tax Withholding For Sharebased Compensation AccrualRelatedToTaxWithholdingForSharebasedCompensation	1399000	USD
CY2019	cmtl	Accrual Related To Tax Withholding For Sharebased Compensation AccrualRelatedToTaxWithholdingForSharebasedCompensation	1787000	USD
CY2021	cmtl	Cash Dividend Declared Including Accrual Of Dividend Equivalents CashDividendDeclaredIncludingAccrualOfDividendEquivalents	2981000	USD
CY2020	cmtl	Cash Dividend Declared Including Accrual Of Dividend Equivalents CashDividendDeclaredIncludingAccrualOfDividendEquivalents	2762000	USD
CY2019	cmtl	Cash Dividend Declared Including Accrual Of Dividend Equivalents CashDividendDeclaredIncludingAccrualOfDividendEquivalents	2733000	USD
CY2021	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	2466000	USD
CY2020	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	1408000	USD
CY2019	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	902000	USD
CY2021	cmtl	Forfeiture Issuance Of Restricted Stock Awards ForfeitureIssuanceOfRestrictedStockAwards	4000	USD
CY2020	cmtl	Forfeiture Issuance Of Restricted Stock Awards ForfeitureIssuanceOfRestrictedStockAwards	0	USD
CY2019	cmtl	Forfeiture Issuance Of Restricted Stock Awards ForfeitureIssuanceOfRestrictedStockAwards	1000	USD
CY2021	us-gaap	Stock Issued1 StockIssued1	28892000	USD
CY2020	us-gaap	Stock Issued1 StockIssued1	11575000	USD
CY2019	us-gaap	Stock Issued1 StockIssued1	5606000	USD
CY2021	cmtl	Accrual Of Deferred Financing Costs AccrualOfDeferredFinancingCosts	139000	USD
CY2020	cmtl	Accrual Of Deferred Financing Costs AccrualOfDeferredFinancingCosts	0	USD
CY2019	cmtl	Accrual Of Deferred Financing Costs AccrualOfDeferredFinancingCosts	0	USD
CY2021	cmtl	Noncash Or Part Noncash Acquisition Accruals NoncashOrPartNoncashAcquisitionAccruals	0	USD
CY2020	cmtl	Noncash Or Part Noncash Acquisition Accruals NoncashOrPartNoncashAcquisitionAccruals	1157000	USD
CY2019	cmtl	Noncash Or Part Noncash Acquisition Accruals NoncashOrPartNoncashAcquisitionAccruals	0	USD
CY2021	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	operating_segment
CY2021	us-gaap	Revenues Revenues	581695000	USD
CY2021	us-gaap	Revenues Revenues	581695000	USD
CY2021	us-gaap	Revenues Revenues	581695000	USD
CY2020	us-gaap	Revenues Revenues	616715000	USD
CY2020	us-gaap	Revenues Revenues	616715000	USD
CY2020	us-gaap	Revenues Revenues	616715000	USD
CY2019	us-gaap	Revenues Revenues	671797000	USD
CY2019	us-gaap	Revenues Revenues	671797000	USD
CY2019	us-gaap	Revenues Revenues	671797000	USD
CY2020	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	34545000	USD
CY2019	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	34225000	USD
CY2021	us-gaap	Contract With Customer Liability Increase Decrease For Contract Acquired In Business Combination ContractWithCustomerLiabilityIncreaseDecreaseForContractAcquiredInBusinessCombination	648000	USD
CY2020	us-gaap	Contract With Customer Liability Increase Decrease For Contract Acquired In Business Combination ContractWithCustomerLiabilityIncreaseDecreaseForContractAcquiredInBusinessCombination	6890000	USD
CY2021Q3	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	658896000	USD
CY2021Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	30861000	USD
CY2020Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	47878000	USD
CY2021	us-gaap	Research And Development Arrangement Contract To Perform For Others Compensation Earned ResearchAndDevelopmentArrangementContractToPerformForOthersCompensationEarned	13635000	USD
CY2020	us-gaap	Research And Development Arrangement Contract To Perform For Others Compensation Earned ResearchAndDevelopmentArrangementContractToPerformForOthersCompensationEarned	11923000	USD
CY2019	us-gaap	Research And Development Arrangement Contract To Perform For Others Compensation Earned ResearchAndDevelopmentArrangementContractToPerformForOthersCompensationEarned	14679000	USD
CY2021	us-gaap	Weighted Average Number Of Shares Treasury Stock WeightedAverageNumberOfSharesTreasuryStock	0	shares
CY2020	us-gaap	Weighted Average Number Of Shares Treasury Stock WeightedAverageNumberOfSharesTreasuryStock	0	shares
CY2019	us-gaap	Weighted Average Number Of Shares Treasury Stock WeightedAverageNumberOfSharesTreasuryStock	0	shares
CY2021	cmtl	Weighted Average Performance Shares Outstanding During The Period That Are Excludedfrom Eps Calculation WeightedAveragePerformanceSharesOutstandingDuringThePeriodThatAreExcludedfromEPSCalculation	232000	shares
CY2020	cmtl	Weighted Average Performance Shares Outstanding During The Period That Are Excludedfrom Eps Calculation WeightedAveragePerformanceSharesOutstandingDuringThePeriodThatAreExcludedfromEPSCalculation	201000	shares
CY2019	cmtl	Weighted Average Performance Shares Outstanding During The Period That Are Excludedfrom Eps Calculation WeightedAveragePerformanceSharesOutstandingDuringThePeriodThatAreExcludedfromEPSCalculation	243000	shares
CY2021	us-gaap	Net Income Loss NetIncomeLoss	-73480000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	7020000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	25041000	USD
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-73480000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	7020000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	25041000	USD
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	25685000	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	24798000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	24124000	shares
CY2021	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	101000	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	178000	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	25685000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	24899000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	24302000	shares
CY2021	us-gaap	Use Of Estimates UseOfEstimates	Use of EstimatesThe preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amount of assets and liabilities, and disclosure of contingent assets and liabilities, at the date of the consolidated financial statements and the reported amounts of net sales and expenses during the reported period. We make significant estimates in many areas of our accounting, including but not limited to the following: long-term contracts, stock-based compensation, intangible assets and liabilities including goodwill, provision for excess and obsolete inventory, allowance for doubtful accounts, warranty obligations and income taxes. Actual results may differ from those estimates.
CY2021	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	ReclassificationsCertain reclassifications have been made to previously reported consolidated financial statements to conform to the fiscal 2021 presentation.
CY2021	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	100292000	USD
CY2020	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	20754000	USD
CY2019	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	5871000	USD
CY2021	us-gaap	Debt Related Commitment Fees And Debt Issuance Costs DebtRelatedCommitmentFeesAndDebtIssuanceCosts	1178000	USD
CY2021Q3	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	159758000	USD
CY2020Q3	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	128585000	USD
CY2021Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1648000	USD
CY2020Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1769000	USD
CY2021Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	158110000	USD
CY2020Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	126816000	USD
CY2021Q3	us-gaap	Inventory Raw Materials InventoryRawMaterials	62249000	USD
CY2020Q3	us-gaap	Inventory Raw Materials InventoryRawMaterials	59175000	USD
CY2021Q3	us-gaap	Inventory Finished Goods And Work In Process InventoryFinishedGoodsAndWorkInProcess	38338000	USD
CY2020Q3	us-gaap	Inventory Finished Goods And Work In Process InventoryFinishedGoodsAndWorkInProcess	42203000	USD
CY2021Q3	us-gaap	Inventory Gross InventoryGross	100587000	USD
CY2020Q3	us-gaap	Inventory Gross InventoryGross	101378000	USD
CY2021Q3	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	20229000	USD
CY2020Q3	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	19076000	USD
CY2021Q3	us-gaap	Inventory Net InventoryNet	80358000	USD
CY2020Q3	us-gaap	Inventory Net InventoryNet	82302000	USD
CY2021Q3	cmtl	Inventory Directly Related To Long Term Contracts InventoryDirectlyRelatedToLongTermContracts	7028000	USD
CY2020Q3	cmtl	Inventory Directly Related To Long Term Contracts InventoryDirectlyRelatedToLongTermContracts	7215000	USD
CY2021Q3	cmtl	Inventory Related To Contracts From Third Party Commercial Customers Who Outsource Their Manufacturing To Company InventoryRelatedToContractsFromThirdPartyCommercialCustomersWhoOutsourceTheirManufacturingToCompany	1509000	USD
CY2020Q3	cmtl	Inventory Related To Contracts From Third Party Commercial Customers Who Outsource Their Manufacturing To Company InventoryRelatedToContractsFromThirdPartyCommercialCustomersWhoOutsourceTheirManufacturingToCompany	1387000	USD
CY2021Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	186326000	USD
CY2020Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	171910000	USD
CY2021Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	151040000	USD
CY2020Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	144873000	USD
CY2021Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	35286000	USD
CY2020Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	27037000	USD
CY2021	us-gaap	Depreciation Depreciation	9343000	USD
CY2020	us-gaap	Depreciation Depreciation	10386000	USD
CY2019	us-gaap	Depreciation Depreciation	11927000	USD
CY2021Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	26367000	USD
CY2020Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	20857000	USD
CY2021Q3	us-gaap	Product Warranty Accrual Classified Current ProductWarrantyAccrualClassifiedCurrent	17600000	USD
CY2020Q3	us-gaap	Product Warranty Accrual Classified Current ProductWarrantyAccrualClassifiedCurrent	15200000	USD
CY2021Q3	cmtl	Accrued Contract Costs AccruedContractCosts	12750000	USD
CY2020Q3	cmtl	Accrued Contract Costs AccruedContractCosts	15306000	USD
CY2021Q3	cmtl	Accrued Acquisition Related Costs AccruedAcquisitionRelatedCosts	9222000	USD
CY2020Q3	cmtl	Accrued Acquisition Related Costs AccruedAcquisitionRelatedCosts	7014000	USD
CY2021Q3	cmtl	Accrued Commissions And Royalties Current AccruedCommissionsAndRoyaltiesCurrent	5342000	USD
CY2020Q3	cmtl	Accrued Commissions And Royalties Current AccruedCommissionsAndRoyaltiesCurrent	4621000	USD
CY2021Q3	us-gaap	Accrued Professional Fees Current AccruedProfessionalFeesCurrent	2854000	USD
CY2020Q3	us-gaap	Accrued Professional Fees Current AccruedProfessionalFeesCurrent	2539000	USD
CY2021Q3	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	15466000	USD
CY2020Q3	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	19624000	USD
CY2021Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	89601000	USD
CY2020Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	85161000	USD
CY2021	cmtl	Minimum Coverage Period Of Product Warranty From Date Of Shipment MinimumCoveragePeriodOfProductWarrantyFromDateOfShipment	P1Y
CY2020Q3	us-gaap	Product Warranty Accrual Classified Current ProductWarrantyAccrualClassifiedCurrent	15200000	USD
CY2019Q3	us-gaap	Product Warranty Accrual Classified Current ProductWarrantyAccrualClassifiedCurrent	15968000	USD
CY2021	us-gaap	Product Warranty Accrual Warranties Issued ProductWarrantyAccrualWarrantiesIssued	4360000	USD
CY2020	us-gaap	Product Warranty Accrual Warranties Issued ProductWarrantyAccrualWarrantiesIssued	2277000	USD
CY2021	us-gaap	Product Warranty Accrual Additions From Business Acquisition ProductWarrantyAccrualAdditionsFromBusinessAcquisition	750000	USD
CY2020	us-gaap	Product Warranty Accrual Additions From Business Acquisition ProductWarrantyAccrualAdditionsFromBusinessAcquisition	1000000	USD
CY2021	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	2710000	USD
CY2020	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	4347000	USD
CY2021	us-gaap	Product Warranty Accrual Preexisting Increase Decrease ProductWarrantyAccrualPreexistingIncreaseDecrease	0	USD
CY2020	us-gaap	Product Warranty Accrual Preexisting Increase Decrease ProductWarrantyAccrualPreexistingIncreaseDecrease	302000	USD
CY2021Q3	us-gaap	Product Warranty Accrual Classified Current ProductWarrantyAccrualClassifiedCurrent	17600000	USD
CY2020Q3	us-gaap	Product Warranty Accrual Classified Current ProductWarrantyAccrualClassifiedCurrent	15200000	USD
CY2019	us-gaap	Write Off Of Deferred Debt Issuance Cost WriteOffOfDeferredDebtIssuanceCost	3217000	USD
CY2021	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	36000	USD
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	175000	USD
CY2021	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	3000	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	4000	USD
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	12152000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	10728000	USD
CY2021	us-gaap	Short Term Lease Cost ShortTermLeaseCost	819000	USD
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	3045000	USD
CY2021	us-gaap	Variable Lease Cost VariableLeaseCost	4523000	USD
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	4033000	USD
CY2021	us-gaap	Sublease Income SubleaseIncome	67000	USD
CY2020	us-gaap	Sublease Income SubleaseIncome	22000	USD
CY2021	us-gaap	Lease Cost LeaseCost	17466000	USD
CY2020	us-gaap	Lease Cost LeaseCost	17963000	USD
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	10868000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	11437000	USD
CY2021	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	3000	USD
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	4000	USD
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	38000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	322000	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	24987000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	3561000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	10376000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	32000	USD
CY2021Q3	cmtl	Lease Liability To Be Paid Year One LeaseLiabilityToBePaidYearOne	10408000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	8029000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	3000	USD
CY2021Q3	cmtl	Lease Liability To Be Paid Year Two LeaseLiabilityToBePaidYearTwo	8032000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	6657000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	0	USD
CY2021Q3	cmtl	Lease Liability To Be Paid Year Three LeaseLiabilityToBePaidYearThree	6657000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	6123000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	0	USD
CY2021Q3	cmtl	Lease Liability To Be Paid Year Four LeaseLiabilityToBePaidYearFour	6123000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	4675000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	0	USD
CY2021Q3	cmtl	Lease Liability To Be Paid Year Five LeaseLiabilityToBePaidYearFive	4675000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	20810000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	0	USD
CY2021Q3	cmtl	Lease Liability To Be Paid After Year Five LeaseLiabilityToBePaidAfterYearFive	20810000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	56670000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	35000	USD
CY2021Q3	cmtl	Lease Liability Payment Due LeaseLiabilityPaymentDue	56705000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	8260000	USD
CY2021Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0352
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	7226000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	28813000	USD
CY2021Q3	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	1000	USD
CY2021Q3	cmtl	Lease Liability Undiscounted Excess Amount LeaseLiabilityUndiscountedExcessAmount	8261000	USD
CY2021Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	48410000	USD
CY2021Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	34000	USD
CY2021Q3	cmtl	Lease Liability LeaseLiability	48444000	USD
CY2021Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y10M20D
CY2021Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P1Y5M26D
CY2021Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0737
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-73153000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-1827000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	2084000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	97000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-74980000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	9310000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	28910000	USD
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	608000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	1053000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-2190000	USD
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-877000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	721000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	4782000	USD
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	466000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1137000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1715000	USD
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-598000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-1312000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-321000	USD
CY2021	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	688000	USD
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	298000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	62000	USD
CY2021	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-1787000	USD
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	393000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-179000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-1500000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2290000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3869000	USD
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-15746000	USD
CY2021	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	1955000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	6071000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2021	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-1371000	USD
CY2021	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.018
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-278000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	-0.030
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	967000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.033
CY2021	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-20000	USD
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	308000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.033
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-44000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.001
CY2021	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	1018000	USD
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	-0.014
CY2020	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	1210000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.130
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	1129000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.039
CY2021	cmtl	Effective Income Tax Rate Reconciliation Deduction Foreign Derived Intangible Income Amount EffectiveIncomeTaxRateReconciliationDeductionForeignDerivedIntangibleIncomeAmount	-164000	USD
CY2021	cmtl	Effective Income Tax Rate Reconciliation Deduction Foreign Derived Intangible Income EffectiveIncomeTaxRateReconciliationDeductionForeignDerivedIntangibleIncome	0.002
CY2020	cmtl	Effective Income Tax Rate Reconciliation Deduction Foreign Derived Intangible Income Amount EffectiveIncomeTaxRateReconciliationDeductionForeignDerivedIntangibleIncomeAmount	162000	USD
CY2020	cmtl	Effective Income Tax Rate Reconciliation Deduction Foreign Derived Intangible Income EffectiveIncomeTaxRateReconciliationDeductionForeignDerivedIntangibleIncome	0.017
CY2019	cmtl	Effective Income Tax Rate Reconciliation Deduction Foreign Derived Intangible Income Amount EffectiveIncomeTaxRateReconciliationDeductionForeignDerivedIntangibleIncomeAmount	632000	USD
CY2019	cmtl	Effective Income Tax Rate Reconciliation Deduction Foreign Derived Intangible Income EffectiveIncomeTaxRateReconciliationDeductionForeignDerivedIntangibleIncome	0.022
CY2021	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	402000	USD
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Other EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther	-0.005
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	301000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Other EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther	0.032
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	394000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Other EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther	0.014
CY2021	cmtl	Effective Income Tax Rate Reconciliation Nondeductible Expense Executive Compensation Amount EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationAmount	628000	USD
CY2021	cmtl	Effective Income Tax Rate Reconciliation Nondeductible Expense Executive Compensation Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationPercent	-0.008
CY2020	cmtl	Effective Income Tax Rate Reconciliation Nondeductible Expense Executive Compensation Amount EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationAmount	595000	USD
CY2020	cmtl	Effective Income Tax Rate Reconciliation Nondeductible Expense Executive Compensation Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationPercent	0.064
CY2019	cmtl	Effective Income Tax Rate Reconciliation Nondeductible Expense Executive Compensation Amount EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationAmount	330000	USD
CY2019	cmtl	Effective Income Tax Rate Reconciliation Nondeductible Expense Executive Compensation Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationPercent	0.011
CY2021	cmtl	Effective Income Tax Rate Reconciliation Fines And Penalties EffectiveIncomeTaxRateReconciliationFinesAndPenalties	0	USD
CY2021	cmtl	Effective Income Tax Rate Reconciliation Fines And Penalties Percent EffectiveIncomeTaxRateReconciliationFinesAndPenaltiesPercent	0
CY2020	cmtl	Effective Income Tax Rate Reconciliation Fines And Penalties EffectiveIncomeTaxRateReconciliationFinesAndPenalties	189000	USD
CY2020	cmtl	Effective Income Tax Rate Reconciliation Fines And Penalties Percent EffectiveIncomeTaxRateReconciliationFinesAndPenaltiesPercent	0.020
CY2019	cmtl	Effective Income Tax Rate Reconciliation Fines And Penalties EffectiveIncomeTaxRateReconciliationFinesAndPenalties	2000	USD
CY2019	cmtl	Effective Income Tax Rate Reconciliation Fines And Penalties Percent EffectiveIncomeTaxRateReconciliationFinesAndPenaltiesPercent	0
CY2021	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	6000	USD
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Tax Settlements EffectiveIncomeTaxRateReconciliationTaxSettlements	0
CY2020	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	1000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Tax Settlements EffectiveIncomeTaxRateReconciliationTaxSettlements	0
CY2019	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	-2081000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Settlements EffectiveIncomeTaxRateReconciliationTaxSettlements	-0.072
CY2021	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-805000	USD
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.011
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	0	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	0	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0
CY2021	cmtl	Effective Income Tax Rate Reconciliation Change In Valuation Allowance Amount EffectiveIncomeTaxRateReconciliationChangeInValuationAllowanceAmount	15582000	USD
CY2021	cmtl	Effective Income Tax Rate Reconciliation Change In Valuation Allowance Percent EffectiveIncomeTaxRateReconciliationChangeInValuationAllowancePercent	-0.208
CY2020	cmtl	Effective Income Tax Rate Reconciliation Change In Valuation Allowance Amount EffectiveIncomeTaxRateReconciliationChangeInValuationAllowanceAmount	0	USD
CY2020	cmtl	Effective Income Tax Rate Reconciliation Change In Valuation Allowance Percent EffectiveIncomeTaxRateReconciliationChangeInValuationAllowancePercent	0
CY2019	cmtl	Effective Income Tax Rate Reconciliation Change In Valuation Allowance Amount EffectiveIncomeTaxRateReconciliationChangeInValuationAllowanceAmount	0	USD
CY2019	cmtl	Effective Income Tax Rate Reconciliation Change In Valuation Allowance Percent EffectiveIncomeTaxRateReconciliationChangeInValuationAllowancePercent	0
CY2021	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-224000	USD
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.003
CY2020	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-135000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	-0.015
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-1500000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0
CY2021	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	226000	USD
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.004
CY2021	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.020
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2290000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0
CY2021	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	676000	USD
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.009
CY2020	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	453000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.049
CY2019	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	5000	USD
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	273000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.030
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-14000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.246
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3869000	USD
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.134
CY2021Q3	cmtl	Deferred Tax Assets Inventory And Warranty Reserves DeferredTaxAssetsInventoryAndWarrantyReserves	6774000	USD
CY2020Q3	cmtl	Deferred Tax Assets Inventory And Warranty Reserves DeferredTaxAssetsInventoryAndWarrantyReserves	5786000	USD
CY2021Q3	cmtl	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation And Commissions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensationAndCommissions	4338000	USD
CY2020Q3	cmtl	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation And Commissions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensationAndCommissions	3210000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Research DeferredTaxAssetsTaxCreditCarryforwardsResearch	19324000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Research DeferredTaxAssetsTaxCreditCarryforwardsResearch	19656000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	4979000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	4955000	USD
CY2021Q3	cmtl	Deferred Tax Assets Foreign Scientific Research And Experimental Development Costs DeferredTaxAssetsForeignScientificResearchAndExperimentalDevelopmentCosts	1496000	USD
CY2020Q3	cmtl	Deferred Tax Assets Foreign Scientific Research And Experimental Development Costs DeferredTaxAssetsForeignScientificResearchAndExperimentalDevelopmentCosts	1765000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	5413000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	3942000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Capital Loss Carryforwards DeferredTaxAssetsCapitalLossCarryforwards	15582000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Capital Loss Carryforwards DeferredTaxAssetsCapitalLossCarryforwards	28000	USD
CY2021Q3	cmtl	Deferred Tax Assets Operating Lease Liabilities DeferredTaxAssetsOperatingLeaseLiabilities	10980000	USD
CY2020Q3	cmtl	Deferred Tax Assets Operating Lease Liabilities DeferredTaxAssetsOperatingLeaseLiabilities	7335000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	4550000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	6572000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	28384000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	11471000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	45052000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	41778000	USD
CY2021Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1146000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	801000	USD
CY2021Q3	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	10085000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	7080000	USD
CY2021Q3	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	54635000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	50368000	USD
CY2021Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	65866000	USD
CY2020Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	58249000	USD
CY2021Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	20814000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	16471000	USD
CY2021Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	20814000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	16471000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Capital Loss Carryforwards DeferredTaxAssetsCapitalLossCarryforwards	15582000	USD
CY2021Q3	cmtl	Future Minimum Taxable Income To Fully Utilize Net Deferred Tax Asset FutureMinimumTaxableIncomeToFullyUtilizeNetDeferredTaxAsset	193800000	USD
CY2021Q3	cmtl	Unrecognized Tax Benefits Including Interest UnrecognizedTaxBenefitsIncludingInterest	9172000	USD
CY2020Q3	cmtl	Unrecognized Tax Benefits Including Interest UnrecognizedTaxBenefitsIncludingInterest	8345000	USD
CY2021Q3	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	163000	USD
CY2020Q3	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	75000	USD
CY2021Q3	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	8408000	USD
CY2020Q3	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	7700000	USD
CY2020Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	8270000	USD
CY2019Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	7203000	USD
CY2018Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	9137000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	528000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	684000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	893000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	338000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	464000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	17000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	48000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	73000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	394000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	79000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	8000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	2450000	USD
CY2021Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	9009000	USD
CY2020Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	8270000	USD
CY2019Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	7203000	USD
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	9983000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	9275000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	11427000	USD
CY2021	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2164000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2042000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2553000	USD
CY2021	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	7819000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	7233000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	8874000	USD
CY2021Q3	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	9625000	USD
CY2021Q3	cmtl	Estimated Forfeitures Related To Total Unrecognized Stock Based Compensation Cost EstimatedForfeituresRelatedToTotalUnrecognizedStockBasedCompensationCost	1040000	USD
CY2021	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P3Y
CY2021Q3	cmtl	Stock Based Compensation Cost Capitalized In Ending Inventory StockBasedCompensationCostCapitalizedInEndingInventory	48000	USD
CY2020Q3	cmtl	Stock Based Compensation Cost Capitalized In Ending Inventory StockBasedCompensationCostCapitalizedInEndingInventory	48000	USD
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	9983000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	9275000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	11427000	USD
CY2021	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2164000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2042000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2553000	USD
CY2021	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	7819000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	7233000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	8874000	USD
CY2018Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1668975	shares
CY2018Q3	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price Beginning Balance1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1	28.72
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	32490	shares
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	30.11
CY2019	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	80930	shares
CY2019	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	28.18
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1555555	shares
CY2019Q3	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price Beginning Balance1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1	28.72
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	327100	shares
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	17.88
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	174840	shares
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	29.06
CY2020	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	285790	shares
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	28.82
CY2020Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1422025	shares
CY2020Q3	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price Beginning Balance1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1	26.17
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	348590	shares
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	27.44
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1073435	shares
CY2021Q3	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price Beginning Balance1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1	25.76
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P4Y3M21D
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	2178000	USD
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	835755	shares
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	28.00
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P3Y10D
CY2021Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	492000	USD
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber	1060830	shares
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice	25.85
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1	P4Y3M3D
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Aggregate Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue	2088000	USD
CY2021	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Lower Range Limit ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit	17.88
CY2021	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Upper Range Limit ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit	33.94
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0	shares
CY2021	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	100292000	USD
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0	shares
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-1500000	USD
CY2021	cmtl	Income Tax Benefit From Settlementof Stock Based Awards IncomeTaxBenefitFromSettlementofStockBasedAwards	142000	USD
CY2020	cmtl	Income Tax Benefit From Settlementof Stock Based Awards IncomeTaxBenefitFromSettlementofStockBasedAwards	-224000	USD
CY2019	cmtl	Income Tax Benefit From Settlementof Stock Based Awards IncomeTaxBenefitFromSettlementofStockBasedAwards	479000	USD
CY2021	us-gaap	Revenues Revenues	581695000	USD
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	-68298000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	-73480000	USD
CY2021	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	139000	USD
CY2021	us-gaap	Interest Expense InterestExpense	6821000	USD
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	9983000	USD
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	9983000	USD
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	21020000	USD
CY2021	us-gaap	Depreciation And Amortization DepreciationAndAmortization	9379000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	21595000	USD
CY2020	us-gaap	Depreciation And Amortization DepreciationAndAmortization	10561000	USD
CY2020	us-gaap	Revenues Revenues	616715000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	15174000	USD
CY2020	cmtl	Contract Settlement Costs ContractSettlementCosts	444000	USD
CY2021	us-gaap	Business Exit Costs1 BusinessExitCosts1	2782000	USD
CY2021	cmtl	Covid19 Related Costs COVID19RelatedCosts	1046000	USD
CY2021	cmtl	Strategic Emerging Technology Costs StrategicEmergingTechnologyCosts	315000	USD
CY2021	cmtl	Adjusted Earnings Losses Before Interest Taxes Depreciation And Amortization AdjustedEarningsLossesBeforeInterestTaxesDepreciationAndAmortization	76519000	USD
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	16037000	USD
CY2021	cmtl	Long Lived Assets Acquired Including Property Plant And Equipment Intangible Assets And Goodwill LongLivedAssetsAcquiredIncludingPropertyPlantAndEquipmentIntangibleAssetsAndGoodwill	47958000	USD
CY2021Q3	us-gaap	Assets Assets	993111000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	7020000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2290000	USD
CY2020	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	190000	USD
CY2020	us-gaap	Interest Expense InterestExpense	6054000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	9275000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	11427000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	18320000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	11927000	USD
CY2019	cmtl	Contract Settlement Costs ContractSettlementCosts	6351000	USD
CY2020	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	20754000	USD
CY2020	cmtl	Adjusted Earnings Losses Before Interest Taxes Depreciation And Amortization AdjustedEarningsLossesBeforeInterestTaxesDepreciationAndAmortization	77803000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	7225000	USD
CY2020	cmtl	Long Lived Assets Acquired Including Property Plant And Equipment Intangible Assets And Goodwill LongLivedAssetsAcquiredIncludingPropertyPlantAndEquipmentIntangibleAssetsAndGoodwill	38451000	USD
CY2020Q3	us-gaap	Assets Assets	929647000	USD
CY2019	us-gaap	Revenues Revenues	671797000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	41407000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	25041000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3869000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-35000	USD
CY2019	us-gaap	Write Off Of Deferred Debt Issuance Cost WriteOffOfDeferredDebtIssuanceCost	3217000	USD
CY2019	us-gaap	Interest Expense InterestExpense	9245000	USD
CY2020Q4	us-gaap	Revenues Revenues	135218000	USD
CY2019	cmtl	Settlement Of Intellectual Property Litigation SettlementOfIntellectualPropertyLitigation	3204000	USD
CY2019	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	5871000	USD
CY2019	us-gaap	Business Exit Costs1 BusinessExitCosts1	1373000	USD
CY2019	cmtl	Adjusted Earnings Losses Before Interest Taxes Depreciation And Amortization AdjustedEarningsLossesBeforeInterestTaxesDepreciationAndAmortization	93472000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	8785000	USD
CY2019	cmtl	Long Lived Assets Acquired Including Property Plant And Equipment Intangible Assets And Goodwill LongLivedAssetsAcquiredIncludingPropertyPlantAndEquipmentIntangibleAssetsAndGoodwill	60693000	USD
CY2019Q3	us-gaap	Assets Assets	887711000	USD
CY2021	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	100292000	USD
CY2020	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	20754000	USD
CY2019	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	5871000	USD
CY2019	cmtl	Settlement Of Intellectual Property Litigation SettlementOfIntellectualPropertyLitigation	3204000	USD
CY2021	cmtl	Covid19 Related Costs COVID19RelatedCosts	1046000	USD
CY2019	cmtl	Covid19 Related Costs COVID19RelatedCosts	0	USD
CY2020	cmtl	Covid19 Related Costs COVID19RelatedCosts	0	USD
CY2021	us-gaap	Debt Related Commitment Fees And Debt Issuance Costs DebtRelatedCommitmentFeesAndDebtIssuanceCosts	1178000	USD
CY2019	us-gaap	Write Off Of Deferred Debt Issuance Cost WriteOffOfDeferredDebtIssuanceCost	3217000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	449933000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	258019000	USD
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	21020000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	21595000	USD
CY2020Q3	us-gaap	Goodwill Goodwill	330519000	USD
CY2021Q3	us-gaap	Goodwill Goodwill	347698000	USD
CY2021	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	operating_segment
CY2021Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	181234000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	268699000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	418233000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	160214000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	18320000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	21781000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	21781000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	21154000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	21041000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	19888000	USD
CY2018Q4	cmtl	Aggregate Registered Amount Available For Sale Of Securities Under Shelf Registration State Additional Amount AggregateRegisteredAmountAvailableForSaleOfSecuritiesUnderShelfRegistrationStateAdditionalAmount	400000000	USD
CY2018Q4	cmtl	Aggregate Registered Amount Available For Sale Of Securities Under Shelf Registration State Additional Amount AggregateRegisteredAmountAvailableForSaleOfSecuritiesUnderShelfRegistrationStateAdditionalAmount	400000000	USD
CY2021	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	0	shares
CY2020	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	0	shares
CY2020Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.10
CY2020Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.10
CY2021Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.10
CY2021Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.10
CY2020Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.10
CY2021Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.10
CY2021Q1	us-gaap	Revenues Revenues	161292000	USD
CY2021Q2	us-gaap	Revenues Revenues	139376000	USD
CY2021Q3	us-gaap	Revenues Revenues	145809000	USD
CY2021Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.10
CY2021Q3	us-gaap	Gross Profit GrossProfit	55054000	USD
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.28
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-2.86
CY2021	us-gaap	Gross Profit GrossProfit	213958000	USD
CY2020Q4	us-gaap	Net Income Loss NetIncomeLoss	-85840000	USD
CY2021Q2	us-gaap	Gross Profit GrossProfit	53016000	USD
CY2021Q3	us-gaap	Gross Profit GrossProfit	55054000	USD
CY2019Q4	us-gaap	Revenues Revenues	170267000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	4205000	USD
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	792000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	7363000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	7363000	USD
CY2021	us-gaap	Revenues Revenues	581695000	USD
CY2020Q4	us-gaap	Gross Profit GrossProfit	50208000	USD
CY2021Q1	us-gaap	Gross Profit GrossProfit	55680000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	-73480000	USD
CY2020Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-3.39
CY2021Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.17
CY2021Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.03
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	6135000	USD
CY2020Q2	us-gaap	Gross Profit GrossProfit	53001000	USD
CY2020Q3	us-gaap	Gross Profit GrossProfit	49663000	USD
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.26
CY2020	us-gaap	Gross Profit GrossProfit	226833000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	6388000	USD
CY2019Q4	us-gaap	Gross Profit GrossProfit	63567000	USD
CY2020Q1	us-gaap	Gross Profit GrossProfit	60602000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	3495000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	-3989000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	1126000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	7020000	USD
CY2020Q1	us-gaap	Revenues Revenues	161654000	USD
CY2020Q2	us-gaap	Revenues Revenues	135121000	USD
CY2020Q3	us-gaap	Revenues Revenues	149673000	USD
CY2020	us-gaap	Revenues Revenues	616715000	USD
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.14
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.16
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.04
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.28
CY2018Q4	us-gaap	Revenues Revenues	160844000	USD
CY2019Q1	us-gaap	Revenues Revenues	164133000	USD
CY2019Q2	us-gaap	Revenues Revenues	170448000	USD
CY2019Q3	us-gaap	Revenues Revenues	176372000	USD
CY2019	us-gaap	Revenues Revenues	671797000	USD
CY2018Q4	us-gaap	Gross Profit GrossProfit	57769000	USD
CY2019Q1	us-gaap	Gross Profit GrossProfit	61245000	USD
CY2019Q2	us-gaap	Gross Profit GrossProfit	64416000	USD
CY2019Q3	us-gaap	Gross Profit GrossProfit	64010000	USD
CY2019	us-gaap	Gross Profit GrossProfit	247440000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	3468000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	7826000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	7612000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	25041000	USD
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.14
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.32
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.31
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.25
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.03

Files In Submission

Name	View Source	Status
0000023197-21-000082-index-headers.html	Edgar Link	pending
0000023197-21-000082-index.html	Edgar Link	pending
0000023197-21-000082.txt	Edgar Link	pending
0000023197-21-000082-xbrl.zip	Edgar Link	pending
cmtl-20210731.htm	Edgar Link	pending
cmtl-20210731.xsd	Edgar Link	pending
cmtl-20210731_cal.xml	Edgar Link	unprocessable
cmtl-20210731_def.xml	Edgar Link	unprocessable
cmtl-20210731_g1.jpg	Edgar Link	pending
cmtl-20210731_g2.jpg	Edgar Link	pending
cmtl-20210731_htm.xml	Edgar Link	completed
cmtl-20210731_lab.xml	Edgar Link	unprocessable
cmtl-20210731_pre.xml	Edgar Link	unprocessable
exhibit10c-2000stockincent.htm	Edgar Link	pending
exhibit10l1-formofchangein.htm	Edgar Link	pending
exhibit10l2-formofchangein.htm	Edgar Link	pending
exhibit21fy21.htm	Edgar Link	pending
exhibit231fy21.htm	Edgar Link	pending
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exhibit4aivdescriptionofse.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
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$CMTL
COMTECH TELECOMMUNICATIONS CORP /DE/ Stock $cmtl

2021 Q3 Form 10-K Financial Statement

#000002319721000082 Filed on October 04, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CMTL COMTECH TELECOMMUNICATIONS CORP /DE/ Stock $cmtl

2021 Q3 Form 10-K Financial Statement

#000002319721000082 Filed on October 04, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CMTL
COMTECH TELECOMMUNICATIONS CORP /DE/ Stock $cmtl