Goodwill and Other Intangible Assets (Tables)

9 Months Ended

May 31, 2018

Finite-Lived Intangible Assets [Line Items]

Schedule of Goodwill [Table Text Block]

	Energy		Ag			Corporate and Other		Total
	(Dollars in thousands)
Balances, August 31, 2017	$	552	$	142,929		$	10,574	$	154,055
Effect of foreign currency translation adjustments	—		(1,709		)	—		(1,709		)
Balances, May 31, 2018	$	552	$	141,220		$	10,574	$	152,346

Schedule of Intangible Assets and Goodwill [Table Text Block]

	May 31, 2018							August 31, 2017
	Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
	(Dollars in thousands)
Customer lists	$	41,077	$	(12,328	)	$	28,749	$	46,180	$	(14,695	)	$	31,485
Trademarks and other intangible assets	6,536		(4,871		)	1,665		23,623		(21,778		)	1,845
Total intangible assets	$	47,613	$	(17,199	)	$	30,414	$	69,803	$	(36,473	)	$	33,330

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

	(Dollars in thousands)
Year 1	$	3,290
Year 2	3,125
Year 3	2,981
Year 4	2,856
Year 5	2,671