Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets - Additional Information (Details)

v3.2.0.727
Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May. 31, 2015
Feb. 28, 2015
May. 31, 2014
May. 31, 2015
May. 31, 2014
Aug. 31, 2014
Goodwill [Line Items]            
Impairment charge $ 0 $ 84,353 $ 0 $ 84,353 $ 0  
Goodwill Impairment charge   77,992   78,530    
Goodwill 612,232     612,232   $ 742,770
Future Amortization Expense, Remainder of 2015 5,900     5,900    
Future Amortization Expense, 2016 23,600     23,600    
Future Amortization Expense, 2017 22,700     22,700    
Future Amortization Expense, 2018 22,300     22,300    
Future Amortization Expense, 2019 22,100     22,100    
Future Amortization Expense, 2020 21,500     21,500    
Future Amortization Expense, Thereafter 86,000     86,000    
Energy            
Goodwill [Line Items]            
Goodwill Impairment charge       78,530    
Goodwill $ 240,715     $ 240,715   $ 350,628
Tradenames            
Goodwill [Line Items]            
Impairment of Intangible Assets (Excluding Goodwill)   $ 6,362