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Earnings Per Common Share (Schedule Of Reconciliation Of Net Income To Net Income Available To Common Shareholders) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014
Earnings Per Common Share [Abstract]
Net income	$ 11,333us-gaap_NetIncomeLoss	$ 10,317us-gaap_NetIncomeLoss	$ 22,119us-gaap_NetIncomeLoss	$ 21,799us-gaap_NetIncomeLoss
Less: Net income allocated to participating securities	(68)wdfc_NetIncomeAllocatedToParticipatingSecurities	(56)wdfc_NetIncomeAllocatedToParticipatingSecurities	(130)wdfc_NetIncomeAllocatedToParticipatingSecurities	(114)wdfc_NetIncomeAllocatedToParticipatingSecurities
Net income available to common shareholders	$ 11,265us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 10,261us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 21,989us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 21,685us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The portion of net income for the reporting period allocated to participating securities other than common shares for the purpose of computing earnings per common share using the two-class method. Net income allocated to participating securities for the period includes dividend equivalents paid to holders of participating securities plus a proportionate share of undistributed net income allocable to participating securities for the period.

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