Fair Value Measurements Recurring Fair Value Measurements by Level (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Feb. 29, 2016	Aug. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	$ 10,579	$ 10,905
Assets, Fair Value Disclosure	513,140	596,917
Liabilities, Fair Value Disclosure	311,643	546,751
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	10,579	10,905
Assets, Fair Value Disclosure	106,898	130,452
Liabilities, Fair Value Disclosure	43,705	58,873
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	406,242	466,465
Liabilities, Fair Value Disclosure	243,783	411,896
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	0	0
Liabilities, Fair Value Disclosure	$ 24,155	$ 75,982