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Condensed Consolidated Statements of Stockholders' Equity (USD $) | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | ---
Beginning balance at Jul. 31, 2013 | $ 404,062,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 2,907,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 363,888,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 403,398,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (366,131,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Treasury stock shares outstanding, beginning of period (in shares) at Jul. 31, 2013 |  |  |  |  | 12,608,501 us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Common stock shares issued, beginning of period (in shares) at Jul. 31, 2013 |  | 29,066,792 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Equity-classified stock award compensation | 3,051,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 3,051,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Equity-classified stock awards issued | 139,000 cmtl_Equityclassifiedstockawardsissued |  | 139,000 cmtl_Equityclassifiedstockawardsissued / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Proceeds from exercise of options | 3,444,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 13,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 3,431,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Proceeds from exercise of options (in shares) |  | 131,175 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Proceeds from issuance of employee stock purchase plan shares | 670,000 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan | 3,000 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 667,000 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Proceeds from issuance of employee stock purchase plan shares (in shares) |  | 29,735 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Common stock issued for net settlement of stock-based awards | (122,000)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation | 1,000 us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (123,000)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Common stock issued for net settlement of stock-based awards (in shares) |  | 8,984 cmtl_StockIssuedDuringThePeriodSharesNetSettlementOfStockBasedAwards / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Debt converted to shares of common stock | 8,518,000 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments | 26,000 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 8,492,000 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Debt converted to shares of common stock (in shares) |  | 266,884 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Cash dividends declared | (13,768,000)us-gaap_DividendsCommonStockCash |  |  | (13,768,000)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Accrual of dividend equivalents | (80,000)us-gaap_DividendsShareBasedCompensationCash |  |  | (80,000)us-gaap_DividendsShareBasedCompensationCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Net income tax shortfall from settlement of stock-based awards | (373,000)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet |  | (373,000)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Reversal of deferred tax assets associated with expired and unexercised stock-based awards | (1,933,000)cmtl_ReversalOfDeferredTaxAssetsAssociatedWithExpiredEquityClassifiedStockBasedAwards |  | (1,933,000)cmtl_ReversalOfDeferredTaxAssetsAssociatedWithExpiredEquityClassifiedStockBasedAwards / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Repurchases of common stock | (58,122,000)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  | (58,122,000)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Repurchases of common stock (in shares) | 1,851,303 us-gaap_TreasuryStockSharesAcquired |  |  |  | 1,851,303 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Net income | 17,163,000 us-gaap_NetIncomeLoss |  |  | 17,163,000 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Ending balance at Apr. 30, 2014 | 362,649,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 2,950,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 377,239,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 406,713,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (424,253,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Treasury stock shares outstanding, end of period (in shares) at Apr. 30, 2014 |  |  |  |  | 14,459,804 us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Common stock shares issued, end of period (in shares) at Apr. 30, 2014 |  | 29,503,570 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Beginning balance at Jul. 31, 2014 | 396,925,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 3,102,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 421,240,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 409,443,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (436,860,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Treasury stock shares outstanding, beginning of period (in shares) at Jul. 31, 2014 | 14,857,582 us-gaap_TreasuryStockShares |  |  |  | 14,857,582 us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Common stock shares issued, beginning of period (in shares) at Jul. 31, 2014 | 31,016,469 us-gaap_CommonStockSharesIssued | 31,016,469 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Equity-classified stock award compensation | 3,642,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 3,642,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Equity-classified stock awards issued | 0 cmtl_Equityclassifiedstockawardsissued |  |  |  |
Proceeds from exercise of options | 1,417,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 5,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,412,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Proceeds from exercise of options (in shares) |  | 49,200 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Proceeds from issuance of employee stock purchase plan shares | 707,000 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan | 2,000 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 705,000 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Proceeds from issuance of employee stock purchase plan shares (in shares) |  | 25,768 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Common stock issued for net settlement of stock-based awards | (420,000)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation | 6,000 us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (426,000)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Common stock issued for net settlement of stock-based awards (in shares) |  | 60,120 cmtl_StockIssuedDuringThePeriodSharesNetSettlementOfStockBasedAwards / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Cash dividends declared | (14,567,000)us-gaap_DividendsCommonStockCash |  |  | (14,567,000)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Accrual of dividend equivalents | (169,000)us-gaap_DividendsShareBasedCompensationCash |  |  | (169,000)us-gaap_DividendsShareBasedCompensationCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Net income tax shortfall from settlement of stock-based awards | (248,000)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet |  | (248,000)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Reversal of deferred tax asset associated with debt converted to shares of common stock | (58,000)us-gaap_AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature |  | (58,000)us-gaap_AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Reversal of deferred tax assets associated with expired and unexercised stock-based awards | (12,000)cmtl_ReversalOfDeferredTaxAssetsAssociatedWithExpiredEquityClassifiedStockBasedAwards |  | (12,000)cmtl_ReversalOfDeferredTaxAssetsAssociatedWithExpiredEquityClassifiedStockBasedAwards / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Repurchases of common stock | (4,989,000)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  | (4,989,000)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Repurchases of common stock (in shares) | 175,735 us-gaap_TreasuryStockSharesAcquired |  |  |  | 175,735 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Net income | 17,770,000 us-gaap_NetIncomeLoss |  |  | 17,770,000 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Ending balance at Apr. 30, 2015 | $ 399,998,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 3,115,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 426,255,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 412,477,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (441,849,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Treasury stock shares outstanding, end of period (in shares) at Apr. 30, 2015 | 15,033,317 us-gaap_TreasuryStockShares |  |  |  | 15,033,317 us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Common stock shares issued, end of period (in shares) at Apr. 30, 2015 | 31,151,557 us-gaap_CommonStockSharesIssued | 31,151,557 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |

X
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- Definition This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415241&loc=d3e4534-113899 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11149-113907 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11178-113907 + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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