Annual report pursuant to Section 13 and 15(d)

Goodwill and Other Intangible Assets - Additional Information(Detail)

v3.5.0.2
Goodwill and Other Intangible Assets - Additional Information(Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Aug. 31, 2016
Aug. 31, 2015
Aug. 31, 2014
Goodwill [Line Items]            
Impairment charge     $ 186,511 $ 186,511 $ 84,353 $ 0
Goodwill, Impairment Charge $ 118,462 $ 78,530 118,122      
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)     16,653      
Impairment of Intangible Assets, Finite-lived     27,952      
Tangible Asset Impairment Charges       23,784    
Future amortization expense, 2017       20,200    
Future amortization expense, 2018       19,900    
Future amortization expense, 2019       19,700    
Future amortization expense, 2020       19,000    
Future amortization expense, 2021       17,900    
Future amortization expense, thereafter       51,900    
maximatecc            
Goodwill [Line Items]            
Impairment charge     45,674      
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       0    
Viking            
Goodwill [Line Items]            
Impairment charge     104,124      
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    
Cortland            
Goodwill [Line Items]            
Impairment charge     36,713      
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    
Energy            
Goodwill [Line Items]            
Impairment charge       $ 140,938 84,353  
Goodwill, Impairment Charge $ 73,919 $ 78,530     78,530  
Energy | Trade Names            
Goodwill [Line Items]            
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)         $ 6,400