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Compensation Plans (Details Textual) (USD $)
3 Months Ended 12 Months Ended
Feb. 29, 2012
Y
Feb. 28, 2011
Nov. 30, 2011
Nov. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total compensation cost related to share-based compensation plans $ 50,600,000 $ 58,200,000    
Aggregate fair value of restricted stock and restricted stock units upon the awards vesting 11,500,000 14,000,000    
Compensation Plans (Textual) [Abstract]        
Net tax benefit (deficiency) related to share-based compensation plans recognized 19,700,000 32,400,000    
Net tax benefit recognized related to share based compensation awards 21,300,000 19,700,000    
Net tax deficiency related to share based compensation awards 12,400,000      
Cash flows resulting from tax deductions in excess of the grant-date fair value of share-based awards 29,316,000 33,763,000    
Total unrecognized compensation cost related to nonvested share based awards 184,900,000      
Employee service share-based compensation, unrecognized compensation costs on Nonvested awards, weighted average period of recognition 3.2      
Limit on number of shares of common stock that may be subject to awards 0.30      
Accrued compensation expense, related to restricted stock and restricted stock units expected to be granted 26,100,000 42,600,000    
Number of years in which Restricted Stock Awards amortized as compensation expense 4 years      
Dividend equivalents declared on restricted stock units 110,000      
Dividend yield 0.90%      
Expected Volatility Rate 32.60%      
Risk Free Interest Rate 3.00%      
Expected Life 4.8      
Tax Benefit Realized from Exercise of Stock Options 61,000 181,000    
Tax benefit to be recognized from exercise of vested Options 28,000,000      
Value of shares available for grant to each non employee director 100,000,000      
Grants vesting period 3 years      
Compensation cost related to plan   133,000,000 174,000,000  
Annual employee contributions 21,250      
Employee service share based compensation plan stock price 95.00%      
Deferred Compensation Arrangement With Individual Terms For Eligibility     200,000,000 200,000,000
Compensation cost related to deferred compensation plan 40,000,000 42,000,000    
Shares issuable under deferred compensation plan 1,765,000      
Contribution related to employee stock ownership plan 0 0    
Compensation cost related to employee stock ownership plan 0 0    
Compensation cost related to profit sharing plan 3,000,000 3,200,000    
Unamortized portion of compensation expense 288,900,000   211,400,000  
No Future Service Required [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Aggregate fair value of restricted stock and restricted stock units upon the awards vesting 7,700,000 4,200,000    
Weighted average grant date fair value $ 14.47      
Restricted Stock Awards [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total compensation cost related to share-based compensation plans $ 50,400,000 $ 58,000,000    
Restricted Stock Units [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average grant date fair value $ 10.73      
Restricted Stock Units [Member] | No Future Service Required [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average grant date fair value $ 10.85