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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
May 31, 2017
Finite-Lived Intangible Assets [Line Items]  
Schedule of Goodwill [Table Text Block]
 
Energy
 
Ag
 
Corporate
and Other
 
Total
 
(Dollars in thousands)
Balances, August 31, 2016
$
552

 
$
148,916

 
$
10,946

 
$
160,414

Effect of foreign currency translation adjustments
—

 
(868
)
 
—

 
(868
)
Impairment
—

 
(5,542
)
 
—

 
(5,542
)
Other
—

 
(298
)
 
(372
)
 
(670
)
Balances, May 31, 2017
$
552

 
$
142,208

 
$
10,574

 
$
153,334
Schedule of Intangible Assets and Goodwill [Table Text Block]
 
May 31,
2017
 
August 31,
2016
 
Carrying Amount
 
Accumulated Amortization
 
Net
 
Carrying Amount
 
Accumulated Amortization
 
Net
 
(Dollars in thousands)
Customer lists
$
48,975

 
$
(14,568
)
 
$
34,407

 
$
51,554

 
$
(15,550
)
 
$
36,004

Trademarks and other intangible assets
23,618

 
(21,713
)
 
1,905

 
35,015

 
(26,253
)
 
8,762

Total intangible assets
$
72,593

 
$
(36,281
)
 
$
36,312

 
$
86,569

 
$
(41,803
)
 
$
44,766
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
 
(Dollars in thousands)
Year 1
$
3,654

Year 2
3,653

Year 3
3,487

Year 4
3,344

Year 5
3,170