Annual report pursuant to Section 13 and 15(d)

U.S. Pension Plan Investment Allocations by Asset Category (Detail)

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U.S. Pension Plan Investment Allocations by Asset Category (Detail) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2021
Aug. 31, 2020
Aug. 31, 2019
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 39,696 $ 39,935  
Percentage of fair value of pension plan assets 100.00% 100.00%  
Foreign Plan Member      
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 9,396 $ 8,980 $ 8,118
Defined Benefit Plan, Plan Assets, Benefits Paid 293 300  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment $ 0 $ (1,687)  
Fixed Income Securities      
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Percentage of fair value of pension plan assets 71.50% 70.90%  
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount $ 28,389 $ 28,297  
Fixed Income Securities | Corporate Bond Securities | Fair Value, Inputs, Level 2      
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 0 $ 0  
Percentage of fair value of pension plan assets 0.00% 0.00%  
Fixed Income Securities | Mutual Funds | Fair Value, Inputs, Level 1      
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 23,564 $ 23,091  
Percentage of fair value of pension plan assets 59.30% 57.90%  
Fixed Income Securities | US Treasury Securities | Fair Value, Inputs, Level 2      
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 4,825 $ 5,206  
Percentage of fair value of pension plan assets 12.20% 13.00%  
Cash and cash equivalents | Fair Value, Inputs, Level 1      
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 0 $ 0  
Percentage of fair value of pension plan assets 0.00% 0.00%  
Equity Securities | Mutual Funds | Fair Value, Inputs, Level 1      
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 11,258 $ 11,583  
Percentage of fair value of pension plan assets 28.40% 29.00%  
Income Receivable      
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount   $ 55  
Percentage of fair value of pension plan assets 0.10% 0.10%  
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount $ 49