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Acquisitions (Details 5) (USD $)
0 Months Ended
Jan. 07, 2014
project
Apr. 30, 2015
Jul. 31, 2014
Jul. 31, 2013
Net Assets        
Goodwill   $ 242,501,000us-gaap_Goodwill $ 231,647,000us-gaap_Goodwill $ 211,618,000us-gaap_Goodwill
Sterilator Company, Inc.        
Acquisitions        
Total consideration for the transaction, excluding transaction costs 3,349,000cmn_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceExcludingTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= cmn_SterilatorCompanyIncMember
     
Net Assets        
Current assets 1,058,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= cmn_SterilatorCompanyIncMember
     
Property, plant and equipment 521,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= cmn_SterilatorCompanyIncMember
     
Current liabilities (321,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= cmn_SterilatorCompanyIncMember
     
Deferred income tax liabilities (276,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= cmn_SterilatorCompanyIncMember
     
Net assets acquired 1,622,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= cmn_SterilatorCompanyIncMember
     
Amortizable intangible assets, useful life 9 years      
Number of in-process research and development projects acquired 0cmn_NumberOfInProcessResearchAndDevelopmentProjectsAcquired
/ us-gaap_BusinessAcquisitionAxis
= cmn_SterilatorCompanyIncMember
     
Goodwill 1,727,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= cmn_SterilatorCompanyIncMember
     
Goodwill deductible for income tax purposes 0us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
/ us-gaap_BusinessAcquisitionAxis
= cmn_SterilatorCompanyIncMember
     
Sterilator Company, Inc. | Customer relationships        
Net Assets        
Amortizable intangible assets 130,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= cmn_SterilatorCompanyIncMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
     
Amortizable intangible assets, useful life 11 years      
Sterilator Company, Inc. | Technology        
Net Assets        
Amortizable intangible assets $ 510,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= cmn_SterilatorCompanyIncMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember
     
Amortizable intangible assets, useful life 8 years