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Other Assets - Rollforward of Capitalized Maintenance Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2013
Capitalized Maintenance Expense [Roll Forward]
Cost Deferred	$ 949	$ 219,898	$ 3,305
Amortization	(73,483)	(45,953)	(45,070)
Capitalized major maintenance	$ 169,054	$ 241,588	$ 67,643	$ 109,408
Minimum \| Major Maintenance Activities Requiring Shutdown
Finite-Lived Intangible Asset, Useful Life	2 years