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Stockholders' Equity (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2015 | Apr. 30, 2015 | Apr. 30, 2014 | Jun. 03, 2015 | Oct. 09, 2014 | Dec. 10, 2014 | Mar. 11, 2015 | Jun. 04, 2015
Stock Repurchase Program |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  | 175,735 us-gaap_TreasuryStockSharesAcquired | 1,851,303 us-gaap_TreasuryStockSharesAcquired |  |  |  |  |
Average price per share of shares repurchased on the open market (in dollars per share) |  | $ 28.39 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 31.40 us-gaap_TreasuryStockAcquiredAverageCostPerShare |  |  |  |  |
Aggregate cost including transaction costs |  | $ 4,989,000 us-gaap_TreasuryStockValueAcquiredCostMethod | $ 58,122,000 us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |  |
Stock repurchase program, remaining authorized repurchase amount | 8,664,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 | 8,664,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  |  |  |  |  |
Maximum amount authorized by the Board of Directors for repurchases of the Company's common stock | 100,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 | 100,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |
Targeted annual dividend per share (in dollars per share) | $ 1.20 cmtl_TargetedAnnualDividendPerShareAmount | $ 1.20 cmtl_TargetedAnnualDividendPerShareAmount |  |  |  |  |  |
Subsequent |  |  |  |  |  |  |  |
Stock Repurchase Program |  |  |  |  |  |  |  |
Stock repurchase program, remaining authorized repurchase amount |  |  |  | $ 8,664,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |
Quarterly Dividend - First |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |
Quarterly dividend payment amount per share (in dollars per share) |  |  |  |  | $ 0.30 us-gaap_DividendsPayableAmountPerShare / us-gaap_DividendsAxis = cmtl_DividendDeclaredFirstMember |  |  |
Quarterly Dividend - Second |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |
Quarterly dividend payment amount per share (in dollars per share) |  |  |  |  |  | $ 0.30 us-gaap_DividendsPayableAmountPerShare / us-gaap_DividendsAxis = cmtl_DividendDeclaredSecondMember |  |
Dividend Declared - Third |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |
Quarterly dividend payment amount per share (in dollars per share) |  |  |  |  |  |  | $ 0.30 us-gaap_DividendsPayableAmountPerShare / us-gaap_DividendsAxis = cmtl_DividendDeclaredThirdMember |
Dividend Declared - Fourth | Subsequent |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |
Quarterly dividend payment amount per share (in dollars per share) |  |  |  |  |  |  |  | $ 0.30 us-gaap_DividendsPayableAmountPerShare / us-gaap_DividendsAxis = cmtl_DividendDeclaredFourthMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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