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Restructuring (Narrative) (Details)	Apr. 30, 2013 employee
Restructuring [Abstract]
Number of employees terminated	500

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- Definition

Number Of Employees Terminated.

+ References

No definition available.

+ Details

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Namespace Prefix:	dci_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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- Details

Name:	us-gaap_RestructuringChargesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration