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Property, Plant and Equipment (Depreciation and Maintenance and Repair Expenses) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2016
Property, Plant and Equipment [Abstract]      
Depreciation expense $ 735,213 $ 724,856 $ 659,542
Maintenance and repair expense $ 266,691 $ 234,332 $ 197,373