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Quarterly Results Of Operations (Schedule of Of Quarterly Results) (Details) - USD ($) $ / shares in Units, $ 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
Operating revenues	$ 132,897	$ 141,319	$ 120,573	$ 121,622	$ 123,540	$ 160,707	$ 141,089	$ 134,845	$ 516,411	$ 560,181	$ 617,933
Cost of operating revenues	92,951	99,511	88,128	87,208	90,075	114,321	101,533	97,931	367,798	403,860	446,938
Earnings (loss) before income taxes	11,020	14,065	(6,193)	10,396	529	20,423	14,138	11,661	29,288	46,751	78,655
Net earnings (loss)	$ 7,808	$ 9,644	$ (4,129)	$ 6,944	$ (3,181)	$ 12,927	$ 8,995	$ 7,568	$ 20,267	$ 26,309	$ 51,512
Diluted net earnings (loss) per share	$ 0.73	$ 0.90	$ (0.37)	$ 0.62	$ (0.28)	$ 1.10	$ 0.75	$ 0.62	$ 1.85	$ 2.22	$ 4.00
Bad debt reserve on accounts receivable					$ 5,000
Reserve against foreign tax assets					$ 2,900					$ 2,900
Environmental Change Reducing Net Earnings [Member]
Environmental expense, net of tax			$ 8,500

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