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Net Earnings Per Share (Schedule Of Computation Of Basic And Diluted Net Earnings Per Share)(Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Nov. 30, 2014	Nov. 30, 2013
Net Earnings Per Share [Abstract]
Net earnings	$ 7,568us-gaap_NetIncomeLoss	$ 10,234us-gaap_NetIncomeLoss
Weighted average shares outstanding	12,224us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	12,889us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted effect of stock awards	50us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	62us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted average shares outstanding assuming dilution	12,274us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	12,951us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic net earnings per share	$ 0.62us-gaap_EarningsPerShareBasic	$ 0.79us-gaap_EarningsPerShareBasic
Diluted net earnings per share	$ 0.62us-gaap_EarningsPerShareDiluted	$ 0.79us-gaap_EarningsPerShareDiluted

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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