Fair Value Measurements Recurring Fair Value Measurements by Level (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	May 31, 2016	Aug. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	$ 11,288	$ 10,905
Assets, Fair Value Disclosure	672,575	596,917
Liabilities, Fair Value Disclosure	511,292	546,751
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	11,288	10,905
Assets, Fair Value Disclosure	131,266	130,452
Liabilities, Fair Value Disclosure	54,705	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	541,309	466,465
Liabilities, Fair Value Disclosure	431,926	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	$ 24,661	$ 75,982