Income Taxes (Current and Noncurrent Net Deferred Tax Assets) (Details 6) - USD ($) $ in Thousands	Aug. 31, 2015	Aug. 31, 2014
Income Taxes [Abstract]
Current deferred tax assets	$ 79,045	$ 64,944
Current deferred tax liabilities	(2,455)	(5,094)
Noncurrent deferred tax assets	85,169	92,702
Noncurrent deferred tax liabilities	(82,167)	(61,670)
Net deferred tax assets	$ 79,592	$ 90,882