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Net Earnings Per Share (Schedule Of Computation Of Basic And Diluted Net Earnings Per Share)(Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 29, 2016	Feb. 28, 2015
Net Earnings Per Share [Abstract]
Net earnings (loss)	$ (4,129)	$ 8,995	$ 2,815	$ 16,563
Weighted average shares outstanding	11,024	11,982	11,142	12,103
Diluted effect of stock awards		26	21	38
Weighted average shares outstanding assuming	11,024	12,008	11,163	12,141
Basic net earnings (loss) per share	$ (0.37)	$ 0.75	$ 0.25	$ 1.37
Diluted net earnings (loss) per share	$ (0.37)	$ 0.75	$ 0.25	$ 1.36

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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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