Other Assets - Schedule of Goodwill (Details) - USD ($)			12 Months Ended
	Mar. 01, 2019	Jul. 31, 2018	Aug. 31, 2019
Goodwill [Roll Forward]
Impairment		$ 0
Balances, end of period			$ 172,404,000
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
Operating Segments
Goodwill [Line Items]
Goodwill, Acquired During Period			61,358,000
Goodwill [Roll Forward]
Balances, beginning of period			138,464,000
Impairment			(27,418,000)
Balances, end of period			172,404,000
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
Ag
Goodwill [Line Items]
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
West Central [Member]
Goodwill [Line Items]
Goodwill, Acquired During Period	$ 61,358,000