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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, 2012	Nov. 30, 2011
Net Earnings Per Share [Abstract]
Net earnings	$ 14,728	$ 2,921
Weighted average shares outstanding	12,756	12,682
Diluted effect of stock equivalents	97	82
Weighted average shares outstanding assuming dilution	12,853	12,764
Basic net earnings per share	$ 1.15	$ 0.23
Diluted net earnings per share	$ 1.15	$ 0.23

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