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Employee Benefit Plans (Fair Value Of Assets Held By U.S. Pension Plans By Asset Category) (Details) (U.S. Assets [Member], USD $)
In Thousands
Jul. 31, 2011
Jul. 31, 2010
Jul. 31, 2009
Defined benefit plan, fair value of plan assets $ 265,300 $ 232,500  
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
     
Defined benefit plan, fair value of plan assets 101,700 66,700  
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Cash [Member]
     
Defined benefit plan, fair value of plan assets 300 900  
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Global Equity Securities [Member]
     
Defined benefit plan, fair value of plan assets 64,800 48,700  
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Private Equity [Member]
     
Defined benefit plan, fair value of plan assets      
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Absolute Return [Member]
     
Defined benefit plan, fair value of plan assets      
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Real Assets [Member]
     
Defined benefit plan, fair value of plan assets      
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fixed Income Securities [Member]
     
Defined benefit plan, fair value of plan assets 36,600 17,100  
Significant Observable Inputs (Level 2) [Member]
     
Defined benefit plan, fair value of plan assets 76,300 99,200  
Significant Observable Inputs (Level 2) [Member] | Cash [Member]
     
Defined benefit plan, fair value of plan assets      
Significant Observable Inputs (Level 2) [Member] | Global Equity Securities [Member]
     
Defined benefit plan, fair value of plan assets 56,200 50,200  
Significant Observable Inputs (Level 2) [Member] | Private Equity [Member]
     
Defined benefit plan, fair value of plan assets      
Significant Observable Inputs (Level 2) [Member] | Absolute Return [Member]
     
Defined benefit plan, fair value of plan assets 20,100 39,400  
Significant Observable Inputs (Level 2) [Member] | Real Assets [Member]
     
Defined benefit plan, fair value of plan assets   9,600  
Significant Observable Inputs (Level 2) [Member] | Fixed Income Securities [Member]
     
Defined benefit plan, fair value of plan assets      
Significant Unobservable Inputs (Level 3) [Member]
     
Defined benefit plan, fair value of plan assets 87,300 66,600 71,000
Significant Unobservable Inputs (Level 3) [Member] | Cash [Member]
     
Defined benefit plan, fair value of plan assets      
Significant Unobservable Inputs (Level 3) [Member] | Global Equity Securities [Member]
     
Defined benefit plan, fair value of plan assets 300 2,400 2,700
Significant Unobservable Inputs (Level 3) [Member] | Private Equity [Member]
     
Defined benefit plan, fair value of plan assets 17,600 14,800 11,400
Significant Unobservable Inputs (Level 3) [Member] | Absolute Return [Member]
     
Defined benefit plan, fair value of plan assets 31,400 33,100 41,400
Significant Unobservable Inputs (Level 3) [Member] | Real Assets [Member]
     
Defined benefit plan, fair value of plan assets 38,000 16,300 15,500
Significant Unobservable Inputs (Level 3) [Member] | Fixed Income Securities [Member]
     
Defined benefit plan, fair value of plan assets      
Cash [Member]
     
Defined benefit plan, fair value of plan assets 300 900  
Global Equity Securities [Member]
     
Defined benefit plan, fair value of plan assets 121,300 101,300  
Private Equity [Member]
     
Defined benefit plan, fair value of plan assets 17,600 14,800  
Absolute Return [Member]
     
Defined benefit plan, fair value of plan assets 51,500 72,500  
Real Assets [Member]
     
Defined benefit plan, fair value of plan assets 38,000 25,900  
Fixed Income Securities [Member]
     
Defined benefit plan, fair value of plan assets $ 36,600 $ 17,100