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Condensed Consolidated Statements of Cash Flows (USD $)
 6 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Cash flows from operating activities:    
Net income $ 12,810,000us-gaap_NetIncomeLoss $ 11,288,000us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash (used in) provided by operating activities:    
Depreciation and amortization of property, plant and equipment 3,230,000us-gaap_Depreciation 3,383,000us-gaap_Depreciation
Amortization of intangible assets with finite lives 3,121,000us-gaap_AmortizationOfIntangibleAssets 3,164,000us-gaap_AmortizationOfIntangibleAssets
Amortization of stock-based compensation 2,398,000us-gaap_AllocatedShareBasedCompensationExpense 2,016,000us-gaap_AllocatedShareBasedCompensationExpense
Deferred financing costs 65,000us-gaap_AmortizationOfFinancingCosts 697,000us-gaap_AmortizationOfFinancingCosts
Change in fair value of contingent earn-out liability 0us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 (239,000)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
Loss on disposal of property, plant and equipment 3,000us-gaap_GainLossOnDispositionOfAssets 42,000us-gaap_GainLossOnDispositionOfAssets
Provision for allowance for doubtful accounts 74,000us-gaap_ProvisionForDoubtfulAccounts 92,000us-gaap_ProvisionForDoubtfulAccounts
Provision for excess and obsolete inventory 1,324,000us-gaap_InventoryWriteDown 1,485,000us-gaap_InventoryWriteDown
Excess income tax benefit from stock-based award exercises (138,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (16,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Deferred income tax benefit (548,000)us-gaap_DeferredIncomeTaxExpenseBenefit (1,689,000)us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in assets and liabilities:    
Accounts receivable (14,083,000)us-gaap_IncreaseDecreaseInAccountsReceivable (7,056,000)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (7,391,000)us-gaap_IncreaseDecreaseInInventories (5,939,000)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets 475,000us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (4,308,000)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Other assets (37,000)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets 6,000us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
Accounts payable (1,006,000)us-gaap_IncreaseDecreaseInAccountsPayable 210,000us-gaap_IncreaseDecreaseInAccountsPayable
Accrued expenses and other current liabilities (2,634,000)us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities (3,574,000)us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities
Customer advances and deposits (4,086,000)us-gaap_IncreaseDecreaseInCustomerAdvancesAndDeposits 409,000us-gaap_IncreaseDecreaseInCustomerAdvancesAndDeposits
Other liabilities (290,000)us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities 149,000us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities
Interest payable (29,000)us-gaap_IncreaseDecreaseInInterestPayableNet 0us-gaap_IncreaseDecreaseInInterestPayableNet
Income taxes payable (1,498,000)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable (66,000)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Net cash (used in) provided by operating activities (8,240,000)us-gaap_NetCashProvidedByUsedInOperatingActivities 54,000us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:    
Purchases of property, plant and equipment (2,145,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (3,424,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash used in investing activities (2,145,000)us-gaap_NetCashProvidedByUsedInInvestingActivities (3,424,000)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:    
Cash dividends paid (9,712,000)us-gaap_PaymentsOfDividendsCommonStock (9,053,000)us-gaap_PaymentsOfDividendsCommonStock
Proceeds from issuance of employee stock purchase plan shares 479,000us-gaap_ProceedsFromStockPlans 430,000us-gaap_ProceedsFromStockPlans
Excess income tax benefit from stock-based award exercises 138,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 16,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Proceeds from exercises of stock options 119,000us-gaap_ProceedsFromStockOptionsExercised 2,559,000us-gaap_ProceedsFromStockOptionsExercised
Repurchases of common stock 0us-gaap_PaymentsForRepurchaseOfCommonStock (29,107,000)us-gaap_PaymentsForRepurchaseOfCommonStock
Fees related to line of credit 0us-gaap_PaymentsOfFinancingCosts (75,000)us-gaap_PaymentsOfFinancingCosts
Payment of contingent consideration related to business acquisition 0cmtl_BusinessAcquisitionContingentConsiderationCashPayment (49,000)cmtl_BusinessAcquisitionContingentConsiderationCashPayment
Net cash used in financing activities (8,976,000)us-gaap_NetCashProvidedByUsedInFinancingActivities (35,279,000)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net decrease in cash and cash equivalents (19,361,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (38,649,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 154,500,000us-gaap_CashAndCashEquivalentsAtCarryingValue 356,642,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 135,139,000us-gaap_CashAndCashEquivalentsAtCarryingValue 317,993,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash paid during the period for:    
Interest 117,000us-gaap_InterestPaid 3,178,000us-gaap_InterestPaid
Income taxes 7,919,000us-gaap_IncomeTaxesPaidNet 8,224,000us-gaap_IncomeTaxesPaidNet
Non-cash investing and financing activities:    
Cash dividends declared but unpaid (including accrual of dividend equivalents) 5,093,000cmtl_CashDividendDeclaredIncludingAccrualOfDividendEquivalents 4,789,000cmtl_CashDividendDeclaredIncludingAccrualOfDividendEquivalents
Equity-classified stock awards issued $ 0cmtl_Equityclassifiedstockawardsissued $ 139,000cmtl_Equityclassifiedstockawardsissued