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, 2012
Aug. 31, 2011
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets $ 33,695 $ 32,412
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 250 5,703
Percentage of fair value of pension plan assets 0.70% 17.60%
Fixed Income securities | Level 2 Valuation
   
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets 10,477 7,338
Percentage of fair value of pension plan assets 31.10% 22.60%
Fixed Income securities | Government Bonds | Level 2 Valuation
   
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets 310 554
Percentage of fair value of pension plan assets 0.90% 1.70%
Fixed Income securities | Corporate Bond | Level 2 Valuation
   
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets 7,489 6,677
Percentage of fair value of pension plan assets 22.20% 20.60%
Fixed Income securities | Mutual Funds | Level 2 Valuation
   
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets 2,678  
Percentage of fair value of pension plan assets 8.00%  
Fixed Income securities | Short Term Fund | Level 2 Valuation
   
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets   107
Percentage of fair value of pension plan assets 0.00% 0.30%
Equity Securities | Level 1 Valuation
   
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets 22,968 19,371
Percentage of fair value of pension plan assets 68.20% 59.80%
Equity Securities | Mutual Funds | Level 1 Valuation
   
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets 22,968  
Percentage of fair value of pension plan assets 68.20%  
Equity Securities | U.S. Companies | Level 1 Valuation
   
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets   14,560
Percentage of fair value of pension plan assets 0.00% 44.90%
Equity Securities | International Companies | Level 1 Valuation
   
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets   $ 4,811
Percentage of fair value of pension plan assets 0.00% 14.80%