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Business Segments and Foreign Operations - Summarized Information about Reportable Segments (Parenthetical) (Detail) (Americas [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2013	Feb. 29, 2012
Americas [Member]
Segment Reporting Information [Line Items]
Corporate expenses	$ 4.9	$ 5.0	$ 9.8	$ 9.6

X

- Details

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

X

- Definition

Corporate expenses.

+ References

No definition available.

+ Details

Name:	wdfc_CorporateExpenses
Namespace Prefix:	wdfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration