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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		6 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2013	Feb. 29, 2012
Net Earnings Per Share [Abstract]
Net earnings	$ 19,351	$ 12,774	$ 34,079	$ 15,695
Weighted average shares outstanding	12,842	12,703	12,799	12,692
Diluted effect of stock equivalents	40	118	68	100
Weighted average shares outstanding assuming dilution	12,882	12,821	12,867	12,792
Basic net earnings per share	$ 1.51	$ 1.01	$ 2.66	$ 1.24
Diluted net earnings per share	$ 1.50	$ 1.00	$ 2.65	$ 1.23

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