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Income Taxes - Additional information (Detail) - USD ($)
 12 Months Ended
Aug. 31, 2021
Aug. 31, 2020
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Operating Loss Carryforwards [Line Items]          
Income tax and earnings from unconsolidated affiliates,Domestic u.s. operations $ 30,700,000 $ 71,200,000 $ 75,000,000.0    
Income tax and earnings from unconsolidated affiliates,Foreign operations $ 22,100,000 $ 53,600,000 $ 78,200,000    
Statutory federal corporate tax rate 21.00% 21.00% 21.00% 25.70% 35.00%
Federal income tax expense (benefit), CARES Act $ 36,600,000        
Deferred tax assets, valuation allowance 10,356,000 $ 9,195,000      
Net increase (decrease) in the valuation allowance 1,100,000        
Unrecognized tax benefits, excluding interest 1,600,000 5,500,000      
Accrued interest related to uncertain tax provisions 400,000 1,100,000      
Increase (reduction) in interest expense relating to reserves for uncertain tax provisions (600,000) $ 400,000      
Accrued penalties related to uncertain tax reserves 0        
State          
Operating Loss Carryforwards [Line Items]          
Operating loss carryforwards $ 68,200,000        
Operating loss carryforwards expiration year 2026        
Credit carryforwards $ 1,200,000        
Credit carryforwards expiration year 2022        
Foreign          
Operating Loss Carryforwards [Line Items]          
Operating loss carryforwards $ 34,500,000        
Operating loss carryforwards expiration year 2022        
Operating loss carryforwards that do not expire $ 26,000,000.0