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Accrued Expenses and Other Current Liabilities (Details) (USD $)
Apr. 30, 2015
Jul. 31, 2014
Apr. 30, 2014
Jul. 31, 2013
Accrued Liabilities, Current [Abstract]        
Accrued wages and benefits $ 10,126,000us-gaap_EmployeeRelatedLiabilitiesCurrent $ 12,410,000us-gaap_EmployeeRelatedLiabilitiesCurrent    
Accrued warranty obligations 8,293,000us-gaap_ProductWarrantyAccrualClassifiedCurrent 8,618,000us-gaap_ProductWarrantyAccrualClassifiedCurrent 8,985,000us-gaap_ProductWarrantyAccrualClassifiedCurrent 7,797,000us-gaap_ProductWarrantyAccrualClassifiedCurrent
Accrued commissions and royalties 2,768,000cmtl_AccruedCommissionsAndRoyaltiesCurrent 3,215,000cmtl_AccruedCommissionsAndRoyaltiesCurrent    
Other 5,888,000us-gaap_OtherAccruedLiabilitiesCurrent 5,560,000us-gaap_OtherAccruedLiabilitiesCurrent    
Accrued expenses and other current liabilities $ 27,075,000us-gaap_AccruedLiabilitiesCurrent $ 29,803,000us-gaap_AccruedLiabilitiesCurrent