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Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	May. 31, 2015	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2012
Loss Contingencies [Line Items]
Rent expense		$ 2.1	$ 2.1	$ 2.0
Liabilities related to indemnification agreement		0.0
Purchase Commitment [Member]
Loss Contingencies [Line Items]
Significant purchase commitment amount committed					$ 1.7
Decrease in inventory and accrued liability	$ 1.7
Commitment outstanding		$ 0.0

X

- Definition

The increase (decrease) during the reporting period in the aggregate amount of expenses incurred but not yet paid.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 230



-SubTopic 10



-Section 45



-Paragraph 28



-Subparagraph (a)



-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 840



-SubTopic 20



-Section 50



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

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- Definition

Liabilities related to indemnification agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	wdfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Purchase commitments amount outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	wdfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Significant purchase commitment amount committed

+ References

No definition available.

+ Details

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Namespace Prefix:	wdfc_
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- Details

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