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Acquisitions (Schedule Of Identifiable Assets Acquired And Liabilities Assumed At Fair Value) (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2015
Jul. 31, 2014
Sep. 30, 2014
Business Acquisition [Line Items]      
Goodwill $ 218,255us-gaap_Goodwill $ 166,406us-gaap_Goodwill  
Northern Technical [Member]      
Business Acquisition [Line Items]      
Cash and cash equivalents     431us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= dci_NorthernTechnicalMember
Accounts receivable     1,083us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= dci_NorthernTechnicalMember
Inventories     7,775us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= dci_NorthernTechnicalMember
Other current assets     934us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
/ us-gaap_BusinessAcquisitionAxis
= dci_NorthernTechnicalMember
Property, plant, and equipment, net     21,829us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= dci_NorthernTechnicalMember
Goodwill     60,266us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= dci_NorthernTechnicalMember
Intangible assets, net     6,200us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= dci_NorthernTechnicalMember
Other assets and deferred taxes     221dci_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssetsAndDeferredTaxes
/ us-gaap_BusinessAcquisitionAxis
= dci_NorthernTechnicalMember
Total assets acquired     98,739us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= dci_NorthernTechnicalMember
Trade accounts payable     149us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= dci_NorthernTechnicalMember
Other current liabilities     1,508us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= dci_NorthernTechnicalMember
Total liabilities assumed     1,657us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= dci_NorthernTechnicalMember
Net assets acquired     $ 97,082us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= dci_NorthernTechnicalMember