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Employee Benefit Plans (Narrative) (Details) (USD $)
12 Months Ended
Jul. 31, 2011
Jul. 31, 2010
Jul. 31, 2009
Curtailment gain (loss)     $ (910,000)
Net underfunded status 30,500,000    
Overfunded plan, other assets included in balance sheet 6,400,000    
Underfunded plan, other long-term liabilities included in balance sheet 36,900,000    
Amount not yet recognized and expected to be recognized in net periodic pension expense, actuarial loss 134,700,000    
Amount not yet recognized and expected to be recognized in net periodic pension expense, prior service cost 5,100,000    
Amount not yet recognized and expected to be recognized in net periodic pension expense, unrecognized transition obligations 3,000,000    
Accumulated benefit obligation for all defined benefit pension plans 365,200,000 332,400,000  
Accumulated benefit obligations in excess of plan assets, projected benefit obligation 294,200,000 282,700,000  
Accumulated benefit obligations in excess of plan assets, accumulated benefit obligation 282,300,000 266,000,000  
Accumulated benefit obligations in excess of plan assets, fair value of plan assets 262,400,000 230,300,000  
Percentage of U.S. pension plans to entity's total plan assets 71.00% 73.00%  
Percentage of U.S. pension plans to entity's total projected benefit obligation 72.00% 74.00%  
Deferred compensation arrangement with individual, maximum future deferred receipts allowed 75.00%    
Deferred compensation arrangement, recorded liability 9,200,000 8,800,000  
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fixed Income Securities [Member]
     
Component of equity/fixed income securities in international pension plan, in percentage 40.00%    
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | International Equity [Member]
     
Component of equity/fixed income securities in international pension plan, in percentage 60.00%    
Significant Unobservable Inputs (Level 3) [Member] | International Equity [Member]
     
Strategic asset allocation, equity securities, minimum 10.00%    
Strategic asset allocation, equity securities, maximum 20.00%    
Strategic asset allocation, fixed income securities, minimum 80.00%    
Strategic asset allocation, fixed income securities, maximum 90.00%    
Fiscal 2012 [Member]
     
Amount not yet recognized and expected to be recognized in net periodic pension expense, actuarial loss 5,800,000    
Amount not yet recognized and expected to be recognized in net periodic pension expense, prior service cost 500,000    
Amount not yet recognized and expected to be recognized in net periodic pension expense, unrecognized transition obligations 200,000    
Contributory Employee Saving Plan [Member]
     
Company's contributions to retirement 9,100,000 4,500,000 5,100,000
Contributory employee saving plan, employee contribution threshold limit from compensation, maximum 25.00%    
Contributory Employee Saving Plan [Member] | U.S. Employees [Member]
     
Contributory employee saving plan, percentage match of participants, first contributions 100.00%    
Contributory employee saving plan, percentage match of participants, second contributions 50.00%    
Contributory employee saving plan, percentage of participants, first eligible compensation 3.00%    
Contributory employee saving plan, percentage of participants, second eligible compensation 2.00%    
Global Equity Securities [Member] | International Equity [Member]
     
Distribution between UK and overseas 50/50    
Equity Securities [Member]
     
Strategic asset allocation, equity securities 45.00%    
Equity Securities [Member] | International Equity [Member]
     
Strategic asset allocation, other assets 15.00%    
Equity Securities [Member] | Long/Short Equity [Member]
     
Strategic asset allocation, other assets 15.00%    
Equity Securities [Member] | Small Cap Equity [Member]
     
Strategic asset allocation, other assets 10.00%    
Equity Securities [Member] | Large Cap Equity [Member]
     
Strategic asset allocation, other assets 5.00%    
Private Equity [Member]
     
Strategic asset allocation, other assets 5.00%    
Hedge Funds [Member]
     
Strategic asset allocation, other assets 30.00%    
Real Assets [Member]
     
Strategic asset allocation, real estates 10.00%    
Fixed Income Securities [Member]
     
Strategic asset allocation, other assets 10.00%    
High Yield Securities [Member] | All U.S. Plans [Member]
     
Component of fixed income securities, in percentage 10.00%    
Foreign Currencies [Member] | All U.S. Plans [Member]
     
Component of fixed income securities, in percentage 20.00%    
All U.S. Plans [Member]
     
Long-term rate of return on plan assets 7.75% 8.00%  
Company's contributions to retirement 20,600,000    
Estimated future contributions to pension plans   0  
Non - U.S. Plans [Member]
     
Company's contributions to retirement 7,100,000    
Estimated future contributions to pension plans 4,700,000    
U.S. Employees [Member]
     
Liability recorded for postretirement benefit plan 1,500,000 1,600,000  
Health care cost rate assumed for Fiscal 2011 7.40%    
Ultimate annual rate 4.50%    
Effect of one-percentage point increase in health care cost trend rate impact on increase liability $ 100,000 $ 100,000