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
Aug. 31, 2015
Aug. 31, 2014
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets $ 39,181 $ 44,642
Percentage of fair value of pension plan assets 100.00% 100.00%
Cash and cash equivalents | Level 1 Valuation    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets $ 314 $ 0
Percentage of fair value of pension plan assets 0.80% 0.00%
Fixed Income Securities | Level 2 Valuation    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets $ 12,581 $ 14,223
Percentage of fair value of pension plan assets 32.10% 31.80%
Fixed Income Securities | Corporate Bond | Level 2 Valuation    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets $ 9,481 $ 9,749
Percentage of fair value of pension plan assets 24.20% 21.80%
Fixed Income Securities | Mutual Funds | Level 2 Valuation    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets $ 3,100 $ 4,474
Percentage of fair value of pension plan assets 7.90% 10.00%
Equity Securities | Mutual Funds | Level 1 Valuation    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets $ 26,286 $ 30,419
Percentage of fair value of pension plan assets 67.10% 68.20%