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Benefit Plans - Schedule of Pension Plans' Fair Value Measurements (Details) (Pension Plans, Defined Benefit, USD $)
In Thousands, unless otherwise specified
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Defined Benefit Plan Disclosure [Line Items]      
Pension plans assets, fair value $ 688,196 $ 540,822 $ 478,361
Level 1
     
Defined Benefit Plan Disclosure [Line Items]      
Pension plans assets, fair value 194,898 169,705  
Level 1 | Cash and cash equivalents
     
Defined Benefit Plan Disclosure [Line Items]      
Pension plans assets, fair value 2,588 3,073  
Level 1 | Mutual funds
     
Defined Benefit Plan Disclosure [Line Items]      
Pension plans assets, fair value 115,515 100,508  
Level 1 | Mutual funds
     
Defined Benefit Plan Disclosure [Line Items]      
Pension plans assets, fair value 76,795 66,124  
Level 1 | Real estate funds
     
Defined Benefit Plan Disclosure [Line Items]      
Pension plans assets, fair value        
Level 1 | Hedge funds
     
Defined Benefit Plan Disclosure [Line Items]      
Pension plans assets, fair value        
Level 2
     
Defined Benefit Plan Disclosure [Line Items]      
Pension plans assets, fair value 475,046 356,404  
Level 2 | Cash and cash equivalents
     
Defined Benefit Plan Disclosure [Line Items]      
Pension plans assets, fair value 21,380 22,325  
Level 2 | Mutual funds
     
Defined Benefit Plan Disclosure [Line Items]      
Pension plans assets, fair value 289,286 198,828  
Level 2 | Mutual funds
     
Defined Benefit Plan Disclosure [Line Items]      
Pension plans assets, fair value 164,380 135,251  
Level 2 | Real estate funds
     
Defined Benefit Plan Disclosure [Line Items]      
Pension plans assets, fair value        
Level 2 | Hedge funds
     
Defined Benefit Plan Disclosure [Line Items]      
Pension plans assets, fair value        
Level 3
     
Defined Benefit Plan Disclosure [Line Items]      
Pension plans assets, fair value 18,252 14,713  
Level 3 | Cash and cash equivalents
     
Defined Benefit Plan Disclosure [Line Items]      
Pension plans assets, fair value        
Level 3 | Mutual funds
     
Defined Benefit Plan Disclosure [Line Items]      
Pension plans assets, fair value        
Level 3 | Mutual funds
     
Defined Benefit Plan Disclosure [Line Items]      
Pension plans assets, fair value 1,868     
Level 3 | Real estate funds
     
Defined Benefit Plan Disclosure [Line Items]      
Pension plans assets, fair value 16,257 14,522  
Level 3 | Hedge funds
     
Defined Benefit Plan Disclosure [Line Items]      
Pension plans assets, fair value 127 191  
Estimate of Fair Value, Fair Value Disclosure [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Pension plans assets, fair value 688,196 540,822  
Estimate of Fair Value, Fair Value Disclosure [Member] | Cash and cash equivalents
     
Defined Benefit Plan Disclosure [Line Items]      
Pension plans assets, fair value 23,968 25,398  
Estimate of Fair Value, Fair Value Disclosure [Member] | Mutual funds
     
Defined Benefit Plan Disclosure [Line Items]      
Pension plans assets, fair value 404,801 299,336  
Estimate of Fair Value, Fair Value Disclosure [Member] | Mutual funds
     
Defined Benefit Plan Disclosure [Line Items]      
Pension plans assets, fair value 243,043 201,375  
Estimate of Fair Value, Fair Value Disclosure [Member] | Real estate funds
     
Defined Benefit Plan Disclosure [Line Items]      
Pension plans assets, fair value 16,257 14,522  
Estimate of Fair Value, Fair Value Disclosure [Member] | Hedge funds
     
Defined Benefit Plan Disclosure [Line Items]      
Pension plans assets, fair value $ 127 $ 191