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Employee Benefit Plans (Fair Value Of Assets Held By International Pension Plans) (Details) (International Assets [Member], USD $)
In Thousands, unless otherwise specified
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2010
Jul. 31, 2009
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, fair value of plan assets $ 113,300 $ 108,200 $ 87,200  
Global Equity Securities [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, fair value of plan assets 37,100 33,500 26,800  
Fixed Income Securities [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, fair value of plan assets 34,300 26,500 20,700  
Equity/Fixed Income [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, fair value of plan assets 35,100 41,700 34,200  
Real Assets [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, fair value of plan assets 6,800 6,500 5,500  
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, fair value of plan assets 56,300 48,900 39,300  
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Global Equity Securities [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, fair value of plan assets 37,100 33,500 26,800  
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fixed Income Securities [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, fair value of plan assets 5,900      
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Equity/Fixed Income [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, fair value of plan assets 13,300 15,400 12,500  
Significant Other Observable Inputs (Level 2) [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, fair value of plan assets 35,200 33,000 26,200  
Significant Other Observable Inputs (Level 2) [Member] | Fixed Income Securities [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, fair value of plan assets 28,400 26,500 20,700  
Significant Other Observable Inputs (Level 2) [Member] | Real Assets [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, fair value of plan assets 6,800 6,500 5,500  
Significant Unobservable Inputs (Level 3) [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, fair value of plan assets 21,800 26,300 21,700  
Significant Unobservable Inputs (Level 3) [Member] | Equity/Fixed Income [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, fair value of plan assets $ 21,800 $ 26,300 $ 21,700 $ 23,100