Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2016
Feb. 29, 2016
May 31, 2015
May 31, 2016
May 31, 2015
Aug. 31, 2015
Impaired Assets [Line Items]            
Goodwill impairment charge   $ 118,122   $ 118,462 $ 77,992  
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)   16,653        
Impairment of Intangible Assets, Finite-lived   27,952        
Tangible Asset Impairment Charges   23,784        
Impairment charges $ 0 186,511 $ 0 186,511 84,353  
Goodwill 529,421     529,421   $ 608,256
Future Amortization Expense, Remainder of 2016 5,600     5,600    
Future Amortization Expense, 2017 21,300     21,300    
Future Amortization Expense, 2018 21,000     21,000    
Future Amortization Expense, 2019 20,700     20,700    
Future Amortization Expense, 2020 19,900     19,900    
Future Amortization Expense, 2021 18,800     18,800    
Future Amortization Expense, Thereafter $ 53,400     $ 53,400    
Tradenames            
Impaired Assets [Line Items]            
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)         $ 6,362  
Viking            
Impaired Assets [Line Items]            
Goodwill impairment charge   39,099        
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)   13,289        
Impairment of Intangible Assets, Finite-lived   27,952        
Tangible Asset Impairment Charges   23,784        
Impairment charges   104,124        
Cortland            
Impaired Assets [Line Items]            
Goodwill impairment charge   34,502        
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)   2,211        
Impairment of Intangible Assets, Finite-lived   0        
Tangible Asset Impairment Charges   0        
Impairment charges   36,713        
maximatecc            
Impaired Assets [Line Items]            
Goodwill impairment charge   44,521        
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)   1,153        
Impairment of Intangible Assets, Finite-lived   0        
Tangible Asset Impairment Charges          
Impairment charges   $ 45,674