Notes Payable and Long-Term Debt - Schedule of Notes Payable and Long-Term Debt (Details) - USD ($) $ in Thousands	May 31, 2019	Aug. 31, 2018
Debt Instrument [Line Items]
Notes payable	$ 2,763,225	$ 2,272,196
Notes payable [Member]
Debt Instrument [Line Items]
Notes payable	2,021,216	1,437,264
CHS Capital notes payable
Debt Instrument [Line Items]
Notes payable	$ 742,009	$ 834,932