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Acquisitions (Narrative) (Details) (USD $)
0 Months Ended 9 Months Ended
Sep. 30, 2014
Apr. 30, 2015
Jul. 31, 2014
Business Acquisition [Line Items]      
Goodwill acquired   218,255,000us-gaap_Goodwill $ 166,406,000us-gaap_Goodwill
Northern Technical [Member]      
Business Acquisition [Line Items]      
Percentage of voting interest acquired 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= dci_NorthernTechnicalMember
   
Total consideration of transaction 97,100,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= dci_NorthernTechnicalMember
   
Amount of intangible assets acquired 6,200,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= dci_NorthernTechnicalMember
   
Net tangible assets 32,200,000dci_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetTangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= dci_NorthernTechnicalMember
   
Goodwill acquired $ 60,266,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= dci_NorthernTechnicalMember
   
Period from purchase date the purchase price allocation is expected to be finalized   1 year  
Northern Technical [Member] | Minimum [Member]      
Business Acquisition [Line Items]      
Estimated useful life, years   6 months  
Northern Technical [Member] | Maximum [Member]      
Business Acquisition [Line Items]      
Estimated useful life, years   7 years