Fair Value Measurements (Assets Held For Sale Measured At Fair Value) (Details) - Nonrecurring - USD ($) $ in Thousands	May 31, 2021	Aug. 31, 2020
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	30,500
Carrying Amount | Level 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets held for sale	$ 60,580	$ 67,380