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Other Assets - Schedule of Goodwill (Details) - USD ($)			12 Months Ended
Other Assets - Schedule of Goodwill (Details) - USD ($)	Mar. 01, 2019	Jul. 31, 2018	Aug. 31, 2019	Aug. 31, 2017
Goodwill [Line Items]
Goodwill, Foreign Currency Translation Gain (Loss)				$ 10,000
Goodwill, Acquired During Period			$ 61,358,000
Goodwill [Roll Forward]
Balances, beginning of period			138,464,000
Impairment		$ 0	(27,418,000)
Balances, end of period			172,404,000	138,454,000
Energy
Goodwill [Line Items]
Goodwill, Foreign Currency Translation Gain (Loss)			0
Goodwill [Roll Forward]
Balances, beginning of period			552,000
Balances, end of period			552,000	552,000
Ag
Goodwill [Line Items]
Goodwill, Foreign Currency Translation Gain (Loss)			10,000
Goodwill, Acquired During Period			61,358,000
Goodwill [Roll Forward]
Balances, beginning of period			127,338,000
Impairment			(27,418,000)
Balances, end of period			161,278,000	127,328,000
Corporate and Other
Goodwill [Line Items]
Goodwill, Foreign Currency Translation Gain (Loss)			0
Goodwill [Roll Forward]
Balances, beginning of period			10,574,000
Balances, end of period			$ 10,574,000	$ 10,574,000
West Central [Member]
Goodwill [Line Items]
Goodwill, Acquired During Period	$ 61,400,000