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Acquisitions (Details) (USD $)
0 Months Ended
Feb. 20, 2015
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
DentaPure        
Acquisitions        
Pre-acquisition annual revenues 2,300,000us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod
/ us-gaap_BusinessAcquisitionAxis
= cmn_DentaPureMember
     
Total consideration for the transaction, excluding acquisition-related costs 9,980,000cmn_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceExcludingAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= cmn_DentaPureMember
     
Net Assets        
Current assets 554,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= cmn_DentaPureMember
     
Property, plant and equipment 50,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= cmn_DentaPureMember
     
Current liabilities (258,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= cmn_DentaPureMember
     
Deferred income tax liabilities (2,191,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= cmn_DentaPureMember
     
Net assets acquired 3,885,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= cmn_DentaPureMember
     
Amortizable intangible assets, useful life 10 years      
Number of in-process research and development projects acquired 0cmn_NumberOfInProcessResearchAndDevelopmentProjectsAcquired
/ us-gaap_BusinessAcquisitionAxis
= cmn_DentaPureMember
     
Goodwill 6,095,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= cmn_DentaPureMember
     
Goodwill deductible for income tax purposes 0us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
/ us-gaap_BusinessAcquisitionAxis
= cmn_DentaPureMember
     
DentaPure | Customer relationships        
Net Assets        
Amortizable intangible assets 4,640,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= cmn_DentaPureMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
     
Amortizable intangible assets, useful life 10 years      
DentaPure | Technology        
Net Assets        
Amortizable intangible assets 780,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= cmn_DentaPureMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember
     
Amortizable intangible assets, useful life 10 years      
DentaPure | Brand names        
Net Assets        
Amortizable intangible assets $ 310,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= cmn_DentaPureMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
     
Amortizable intangible assets, useful life 10 years