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Stock Plans (Details 2) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Compensation expense      
Excess tax benefit from share-based payment $ 1,754,000 $ 1,254,000 $ 61,248,000
Stock options
     
Options Outstanding      
Number outstanding as of end of period (in shares) 1.6    
Weighted Average Remaining Contractual Life 2 years 6 months 11 days    
Weighted Average Exercise Price (in dollars per share) $ 24.73    
Aggregate Intrinsic Value (in millions) 10,100,000    
Options Exercisable      
Number Exercisable at the end of the period (in shares) 1.4    
Weighted Average Remaining Contractual Life 2 years 4 months 24 days    
Weighted Average Exercise Price (in dollars per share) $ 24.51    
Stock Incentive Plans, additional disclosures      
Remaining contractual life of options outstanding, low end of range 1 month 6 days    
Remaining contractual life of options outstanding, high end of range 4 years 6 months 4 days    
Aggregate intrinsic value of stock options exercised 7,900,000 3,900,000 7,800,000
Compensation expense      
Recognized compensation expense 300,000 2,400,000 4,600,000
Unrecognized compensation expense 200,000    
Period of recognition of unrecognized compensation expense 3 years    
Excess tax benefit from share-based payment 1,800,000 1,300,000 61,200,000
Performance Earnings Program
     
Compensation expense      
Unrecognized compensation expense 52,400,000    
Period of recognition of unrecognized compensation expense 3 years    
Performance period over which objectives must be met to qualify for an award grant 3 years    
Restricted stock units
     
Compensation expense      
Recognized compensation expense 31,100,000 24,100,000 20,400,000
Unrecognized compensation expense 52,400,000    
Period of recognition of unrecognized compensation expense 3 years    
Range of Exercise Prices from $14.20 to $23.94
     
Information concerning outstanding and exercisable options      
Exercise price, low end of range (in dollars per share) $ 14.20    
Exercise price, high end of range (in dollars per share) $ 23.94    
Range of Exercise Prices from $14.20 to $23.94 | Stock options
     
Options Outstanding      
Number outstanding as of end of period (in shares) 0.6    
Weighted Average Remaining Contractual Life 1 year 10 months 24 days    
Weighted Average Exercise Price (in dollars per share) $ 22.20    
Aggregate Intrinsic Value (in millions) 5,800,000    
Options Exercisable      
Number Exercisable at the end of the period (in shares) 0.6    
Weighted Average Remaining Contractual Life 1 year 10 months 24 days    
Weighted Average Exercise Price (in dollars per share) $ 22.20    
Range of Exercise Prices from $24.45 to $26.47
     
Information concerning outstanding and exercisable options      
Exercise price, low end of range (in dollars per share) $ 24.45    
Exercise price, high end of range (in dollars per share) $ 26.47    
Range of Exercise Prices from $24.45 to $26.47 | Stock options
     
Options Outstanding      
Number outstanding as of end of period (in shares) 0.4    
Weighted Average Remaining Contractual Life 2 years 11 months 16 days    
Weighted Average Exercise Price (in dollars per share) $ 24.56    
Aggregate Intrinsic Value (in millions) 2,400,000    
Options Exercisable      
Number Exercisable at the end of the period (in shares) 0.4    
Weighted Average Remaining Contractual Life 2 years 11 months 16 days    
Weighted Average Exercise Price (in dollars per share) $ 24.56    
Range of Exercise Prices from $27.00 to $34.00
     
Information concerning outstanding and exercisable options      
Exercise price, low end of range (in dollars per share) $ 27.00    
Exercise price, high end of range (in dollars per share) $ 34.00    
Range of Exercise Prices from $27.00 to $34.00 | Stock options
     
Options Outstanding      
Number outstanding as of end of period (in shares) 0.6    
Weighted Average Remaining Contractual Life 2 years 11 months 26 days    
Weighted Average Exercise Price (in dollars per share) $ 27.84    
Aggregate Intrinsic Value (in millions) $ 1,900,000    
Options Exercisable      
Number Exercisable at the end of the period (in shares) 0.4    
Weighted Average Remaining Contractual Life 2 years 8 months 5 days    
Weighted Average Exercise Price (in dollars per share) $ 27.91    
Range of Exercise Prices from $14.20 to $34.00
     
Information concerning outstanding and exercisable options      
Exercise price, low end of range (in dollars per share) $ 14.20    
Exercise price, high end of range (in dollars per share) $ 34.00