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Acquisitions Business Combination, Preliminary Purchase Price Allocation (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Business Combinations [Abstract]    
Current Assets $ 60,577  
Property, plant and equipment 312,288  
Goodwill, Acquired During Period 423 $ 72,913
Other assets 16,118  
Current liabilities (60,127)  
Other liabilities (8,261)  
Total net assets acquired $ 321,018