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Fair Value Measurements (Assets Held For Sale Measured At Fair Value) (Details) - Fair Value, Nonrecurring - USD ($)
$ in Thousands
Aug. 31, 2020
Aug. 31, 2019
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Assets held for sale, assets with fair value exceeding carrying value $ 30,100  
Level 2    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Assets held for sale, assets with carrying value approximating fair value 37,300  
Carrying Amount    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Assets held-for-sale $ 67,380 $ 0