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Property, Plant and Equipment - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2016
Property, Plant and Equipment [Line Items]      
Assets under capital leases $ 50,000 $ 58,200  
Accumulated amortization on assets under capital leases 18,900 27,400  
Impairment charge (10,352) 145,042 $ 27,247
Depreciation expense $ 475,800 475,900 $ 437,600
Reserve and impairment charges [Member] | Ag      
Property, Plant and Equipment [Line Items]      
Impairment charge   30,400  
Reserve and impairment charges [Member] | Energy      
Property, Plant and Equipment [Line Items]      
Impairment charge   $ 32,700