Annual report pursuant to Section 13 and 15(d)

Goodwill and Other Intangible Assets - Additional Information(Detail)

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Goodwill and Other Intangible Assets - Additional Information(Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Feb. 29, 2016
Aug. 31, 2016
Aug. 31, 2015
Aug. 31, 2017
Goodwill [Line Items]        
Impairment charge $ 186,511 $ 186,511 $ 84,353  
Goodwill, Impairment Charge 118,122 118,462    
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, 2018       $ 20,400
Future amortization expense, 2019       19,800
Future amortization expense, 2020       19,200
Future amortization expense, 2021       18,300
Future amortization expense, 2022       16,300
Future amortization expense, thereafter       $ 35,400
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   140,900 84,400  
Goodwill, Impairment Charge   $ 73,919 78,500  
Energy | Trade Names        
Goodwill [Line Items]        
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)     $ 6,400