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Earnings Per Share (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2015 | Apr. 30, 2014
Earnings Per Share [Abstract] |  |  |  |
Net income for basic calculation | $ 4,960,000 us-gaap_NetIncomeLoss | $ 5,875,000 us-gaap_NetIncomeLoss | $ 17,770,000 us-gaap_NetIncomeLoss | $ 17,163,000 us-gaap_NetIncomeLoss
Interest expense (net of tax) on 3.0% convertible senior notes | 0 us-gaap_InterestOnConvertibleDebtNetOfTax | 1,117,000 us-gaap_InterestOnConvertibleDebtNetOfTax | 0 us-gaap_InterestOnConvertibleDebtNetOfTax | 3,351,000 us-gaap_InterestOnConvertibleDebtNetOfTax
Numerator for diluted calculation | 4,960,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | 6,992,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | 17,770,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | 20,514,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Denominator for basic calculation (in shares) | 16,202,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 15,200,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 16,220,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 15,882,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect on shares of stock-based awards (in shares) | 180,000 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 290,000 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 248,000 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 218,000 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Dilutive effect on shares of conversion of 3.0% convertible senior notes (in shares) | 0 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities | 6,274,000 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities | 0 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities | 6,224,000 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
Denominator for diluted calculation (in shares) | 16,382,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 21,764,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 16,468,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 22,324,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Amount of convertible senior notes outstanding |  | $ 191,499,000 us-gaap_ConvertibleNotesPayableCurrent |  | $ 191,499,000 us-gaap_ConvertibleNotesPayableCurrent
Debt Instrument, Interest Rate, Stated Percentage |  | 3.00%us-gaap_DebtInstrumentInterestRateStatedPercentage |  | 3.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
Reduction in weighted average number of shares as a result of the repurchase of common shares | 83,000 us-gaap_WeightedAverageNumberOfSharesTreasuryStock | 482,000 us-gaap_WeightedAverageNumberOfSharesTreasuryStock | 27,000 us-gaap_WeightedAverageNumberOfSharesTreasuryStock | 657,000 us-gaap_WeightedAverageNumberOfSharesTreasuryStock
Weighted average performance shares outstanding during the period that are excluded from EPS calculation | 124,000 cmtl_WeightedAveragePerformanceSharesOutstandingDuringThePeriodThatAreExcludedfromEPSCalculation | 92,000 cmtl_WeightedAveragePerformanceSharesOutstandingDuringThePeriodThatAreExcludedfromEPSCalculation | 118,000 cmtl_WeightedAveragePerformanceSharesOutstandingDuringThePeriodThatAreExcludedfromEPSCalculation | 78,000 cmtl_WeightedAveragePerformanceSharesOutstandingDuringThePeriodThatAreExcludedfromEPSCalculation
Stock-Based Awards |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive equity-classified stock-based awards not included in calculation of diluted earnings per share (in shares) | 685,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = cmtl_StockBasedAwardsMember | 566,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = cmtl_StockBasedAwardsMember | 477,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = cmtl_StockBasedAwardsMember | 898,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = cmtl_StockBasedAwardsMember

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- Definition Carrying value as of the balance sheet date of the portion of long-term debt due within one year or the operating cycle if longer identified as Convertible Notes Payable. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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