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Fair Value Measurements (Details) (USD $)	12 Months Ended
	Aug. 31, 2012	Aug. 31, 2011
Fair value of assets measured on recurring basis
Total assets	$ 5,058,000	$ 533,000
Fair Value Measurements (Textual) [Abstract]
Fair value of long-term debt	0	10,900,000
Fair value measurement transfer	0	0
Level 1 [Member]
Fair value of assets measured on recurring basis
Total assets	0	0
Level 2 [Member]
Fair value of assets measured on recurring basis
Total assets	5,058,000	533,000
Level 3 [Member]
Fair value of assets measured on recurring basis
Total assets	0	0
Money Market Funds [Member]
Fair value of assets measured on recurring basis
Total assets	4,025,000	0
Money Market Funds [Member] | Level 1 [Member]
Fair value of assets measured on recurring basis
Total assets	0	0
Money Market Funds [Member] | Level 2 [Member]
Fair value of assets measured on recurring basis
Total assets	4,025,000	0
Money Market Funds [Member] | Level 3 [Member]
Fair value of assets measured on recurring basis
Total assets	0	0
Term Deposits [Member]
Fair value of assets measured on recurring basis
Total assets	1,033,000	533,000
Term Deposits [Member] | Level 1 [Member]
Fair value of assets measured on recurring basis
Total assets	0	0
Term Deposits [Member] | Level 2 [Member]
Fair value of assets measured on recurring basis
Total assets	1,033,000	533,000
Term Deposits [Member] | Level 3 [Member]
Fair value of assets measured on recurring basis
Total assets	$ 0	$ 0

X

- Details

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

X

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	wdfc_FairValueMeasurementsTextualAbstract
Namespace Prefix:	wdfc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value measurements transfers between level one and level two.

+ References

No definition available.

+ Details

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