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Revenue Recognition (Summary of Impacts of ASU on Condensed Consolidated Statement of Earnings) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2019	May 31, 2018
Statement of Earnings
Operating revenues	$ 121,054	$ 169,571	$ 342,187	$ 424,436
Operating income	4,475	$ 18,814	2,055	$ 32,306
ASC Topic 606 Adjustments [Member] | ASC Topic 606 [Member]
Statement of Earnings
Operating revenues	43		(6,303)
Operating income	(38)		(3,429)
Balance Without Adoption of ASC Topic 606 [Member] | ASC Topic 606 [Member]
Statement of Earnings
Operating revenues	121,097		335,884
Operating income	$ 4,437		$ (1,374)

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Topic 280
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