Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets - Additional Information (Details)

v3.7.0.1
Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2017
May 31, 2016
Feb. 29, 2016
May 31, 2017
May 31, 2016
Aug. 31, 2016
Impaired Assets [Line Items]            
Goodwill, Impairment Loss     $ 118,122      
Goodwill $ 519,793     $ 519,793   $ 519,276
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)     16,653      
Impairment of Intangible Assets, Finite-lived     27,952      
Tangible Asset Impairment Charges     23,784      
Asset Impairment Charges 0 $ 0 186,511 0 $ 186,511  
Future Amortization Expense, Remainder of 2017 5,100     5,100    
Future Amortization Expense, 2018 20,200     20,200    
Future Amortization Expense, 2019 19,600     19,600    
Future Amortization Expense, 2020 18,900     18,900    
Future Amortization Expense, 2021 18,000     18,000    
Future Amortization Expense, 2022 16,000     16,000    
Future Amortization Expense, Thereafter 34,800     34,800    
Energy            
Impaired Assets [Line Items]            
Goodwill 187,224     187,224   187,321
Asset Impairment Charges         140,900  
Engineered Solutions            
Impaired Assets [Line Items]            
Goodwill $ 230,670     $ 230,670   $ 230,216
Asset Impairment Charges         $ 45,700  
Cortland [Domain]            
Impaired Assets [Line Items]            
Goodwill, Impairment Loss     34,502      
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)     2,211      
Impairment of Intangible Assets, Finite-lived     0      
Tangible Asset Impairment Charges     0      
Asset Impairment Charges     36,713      
Viking [Domain]            
Impaired Assets [Line Items]            
Goodwill, Impairment Loss     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      
Asset Impairment Charges     104,124      
maximatecc [Domain]            
Impaired Assets [Line Items]            
Goodwill, Impairment Loss     44,521      
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)     1,153      
Impairment of Intangible Assets, Finite-lived     0      
Tangible Asset Impairment Charges     0      
Asset Impairment Charges     $ 45,674