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Common Stock (Narrative) (Details) (USD $)
1 Months Ended12 Months Ended
Feb. 28, 2009
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Common stock repurchased, shares 3,000,0001,000,000 
Amount of repurchase of common stock $ 110,000,000$ 34,500,000 
Number of shares approved for the repurchase of common stock 3,000,000  
Treasury shares acquired, shares 26,700,000  
Shares remaining for purchase under the Board's authorization 2,000,000  
Stock-based compensation, additional shares reserved for issuance5,500,000   
Stock-based compensation, number of shares authorized15,300,000   
Stock-based compensation, shares available for future grants 6,200,000  
Treasury stock, shares 18,637,54017,537,029 
Maximum contractual term for shares to vest, years ten  
Total intrinsic value 23,300,0003,900,00015,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 628,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 551,000  
Total vest date fair value of shares 15,900,0007,300,0001,900,000
Maximum [Member]
    
Period during which shares vest, in years four  
Maximum [Member] | Restricted Stock Units (RSUs) [Member]
    
Period during which shares vest, in years five  
Minimum [Member]
    
Period during which shares vest, in years three  
Minimum [Member] | Restricted Stock Units (RSUs) [Member]
    
Period during which shares vest, in years one  
Minimum [Member] | Performance-Based Stock Option [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 500,000  
Stock Options [Member]
    
Closing stock price 30.02  
Unrecognized compensation expenses 8,200,000  
Weighted average period, years 2.8  
Restricted Stock Units (RSUs) [Member]
    
Unrecognized compensation expenses 7,200,000  
Weighted average period, years 2.2  
Stock-Based Awards [Member]
    
Treasury stock, shares 18,600,000  
Performance-Based Stock Option [Member]
    
Closing stock price 30.02  
Unrecognized compensation expenses 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 00 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 0  
Performance Share Units [Member]
    
Unrecognized compensation expenses $ 4,800,000