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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								12 Months Ended
	Aug. 31, 2016	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	May 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2014
Net Earnings Per Share [Abstract]
Net earnings	$ 7,808	$ 9,644	$ (4,129)	$ 6,944	$ (3,181)	$ 12,927	$ 8,995	$ 7,568	$ 20,267	$ 26,309	$ 51,512
Weighted average shares outstanding									10,906	11,818	12,832
Diluted effect of stock equivalents									24	37	50
Weighted average shares outstanding assuming dilution									10,930	11,855	12,882
Basic net earnings per share									$ 1.86	$ 2.23	$ 4.01
Diluted net earnings per share	$ 0.73	$ 0.90	$ (0.37)	$ 0.62	$ (0.28)	$ 1.10	$ 0.75	$ 0.62	$ 1.85	$ 2.22	$ 4.00

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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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