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Stock-Based Compensation - Expenses (Details) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2015 | Apr. 30, 2014 | Jul. 31, 2014
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense before income tax benefit | $ 1,244,000 us-gaap_AllocatedShareBasedCompensationExpense | $ 1,070,000 us-gaap_AllocatedShareBasedCompensationExpense | $ 3,642,000 us-gaap_AllocatedShareBasedCompensationExpense | $ 3,086,000 us-gaap_AllocatedShareBasedCompensationExpense |
Estimated income tax benefit | (432,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | (394,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | (1,283,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | (1,143,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense |
Net stock-based compensation expense | 812,000 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax | 676,000 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax | 2,359,000 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax | 1,943,000 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax |
Total remaining unrecognized compensation cost related to the unvested stock-based awards | 8,786,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  | 8,786,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |
Estimated forfeitures related to unvested stock-based awards | 608,000 cmtl_EstimatedForfeituresRelatedToTotalUnrecognizedStockBasedCompensationCost |  | 608,000 cmtl_EstimatedForfeituresRelatedToTotalUnrecognizedStockBasedCompensationCost |  |
Weighted average number of years net compensation cost is expected to be recognized over |  |  | 3 years 0 months 0 days |  |
Stock-based compensation capitalized and included in ending inventory | 68,000 cmtl_StockBasedCompensationCostCapitalizedInEndingInventory |  | 68,000 cmtl_StockBasedCompensationCostCapitalizedInEndingInventory |  | 68,000 cmtl_StockBasedCompensationCostCapitalizedInEndingInventory
Stock Options |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense before income tax benefit | 778,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 668,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 2,267,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 2,035,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Performance Shares |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense before income tax benefit | 308,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | 264,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | 883,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | 671,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |
Employee Stock Purchase Plan - ESPP |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense before income tax benefit | 52,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = cmtl_EmployeeStockPurchasePlanEsppMember | 47,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = cmtl_EmployeeStockPurchasePlanEsppMember | 158,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = cmtl_EmployeeStockPurchasePlanEsppMember | 135,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = cmtl_EmployeeStockPurchasePlanEsppMember |
Discount offered to employees participating in the ESPP as a percentage of market price |  |  | 15.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPricePurchaseDate / us-gaap_AwardTypeAxis = cmtl_EmployeeStockPurchasePlanEsppMember | 15.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPricePurchaseDate / us-gaap_AwardTypeAxis = cmtl_EmployeeStockPurchasePlanEsppMember |
RSUs and restricted stock |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense before income tax benefit | 106,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 67,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 306,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 203,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
Share units |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense before income tax benefit | 0 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = cmtl_ShareunitsMember | 15,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = cmtl_ShareunitsMember | 28,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = cmtl_ShareunitsMember | 27,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = cmtl_ShareunitsMember |
Total equity-classified stock-based awards |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense before income tax benefit | 1,244,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = cmtl_EquityclassifiedstockbasedawardsMember | 1,061,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = cmtl_EquityclassifiedstockbasedawardsMember | 3,642,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = cmtl_EquityclassifiedstockbasedawardsMember | 3,071,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = cmtl_EquityclassifiedstockbasedawardsMember |
SARs |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense before income tax benefit | 0 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | 9,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | 0 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | 15,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |
Cost of sales |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense before income tax benefit | 71,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 57,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 204,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 194,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember |
Selling, general and administrative expenses |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense before income tax benefit | 1,005,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember | 860,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember | 2,963,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember | 2,463,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember |
Research and development expenses |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense before income tax benefit | $ 168,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember | $ 153,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember | $ 475,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember | $ 429,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Discount rate from fair value on purchase date that participants pay for shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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