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, unless otherwise specified
Aug. 31, 2014
Aug. 31, 2013
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets $ 44,642 $ 34,054
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 0 348
Percentage of fair value of pension plan assets 0.00% 1.00%
Fixed Income Securities | Level 2 Valuation
   
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets 14,223 12,205
Percentage of fair value of pension plan assets 31.80% 35.90%
Fixed Income Securities | Corporate Bond | Level 2 Valuation
   
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets 9,749 8,741
Percentage of fair value of pension plan assets 21.80% 25.70%
Fixed Income Securities | Mutual Funds | Level 2 Valuation
   
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets 4,474 3,464
Percentage of fair value of pension plan assets 10.00% 10.20%
Equity Securities | Mutual Funds | Level 1 Valuation
   
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets $ 30,419 $ 21,501
Percentage of fair value of pension plan assets 68.20% 63.10%