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Stock Plans (Details 2) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Compensation expense      
Excess tax benefit from share-based payment $ 748 $ 1,754 $ 1,254
Employee Stock Option      
Options Outstanding      
Number outstanding as of end of period (in shares) 1.6    
Weighted Average Remaining Contractual Life 4 years 8 months 9 days    
Weighted Average Exercise Price (in dollars per share) $ 27.69    
Aggregate Intrinsic Value (in millions) $ 8,500    
Options Exercisable      
Number Exercisable at the end of the period (in shares) 0.9    
Weighted Average Remaining Contractual Life 1 year 7 months 24 days    
Weighted Average Exercise Price (in dollars per share) $ 25.16    
Stock Incentive Plans, additional disclosures      
Remaining contractual life of options outstanding, low end of range 11 days    
Remaining contractual life of options outstanding, high end of range 9 years 5 months 5 days    
Aggregate intrinsic value of stock options exercised $ 4,300 7,900 3,900
Compensation expense      
Weighted average grant-date fair value of stock options granted (in dollars per share) $ 7.83    
Excess tax benefit from share-based payment $ 700 $ 1,800 $ 1,300
Performance Earnings Program      
Compensation expense      
Unrecognized compensation expense $ 62,400    
Vesting period 3 years    
Weighted average grant-date fair value of stock options granted (in dollars per share) $ 29.32 $ 22.27 $ 20.58
Performance period over which objectives must be met to qualify for an award grant 3 years    
Restricted Stock Units (RSUs)      
Compensation expense      
Recognized compensation expense $ 34,400 $ 32,600 $ 26,600
Weighted average grant-date fair value of stock options granted (in dollars per share) $ 29.60 $ 22.83 $ 20.62
Parent      
Compensation expense      
Excess tax benefit from share-based payment $ 700 $ 1,700 $ 1,300
Exercise Price Range from Dollars 21.01 to Dollars 23.94 [Member]      
Information concerning outstanding and exercisable options      
Exercise price, low end of range (in dollars per share) $ 21.01    
Exercise price, high end of range (in dollars per share) $ 23.94    
Exercise Price Range from Dollars 21.01 to Dollars 23.94 [Member] | Employee Stock Option      
Options Outstanding      
Number outstanding as of end of period (in shares) 0.4    
Weighted Average Remaining Contractual Life 1 year 2 months 5 days    
Weighted Average Exercise Price (in dollars per share) $ 23.46    
Aggregate Intrinsic Value (in millions) $ 4,100    
Options Exercisable      
Number Exercisable at the end of the period (in shares) 0.4    
Weighted Average Remaining Contractual Life 1 year 2 months 5 days    
Weighted Average Exercise Price (in dollars per share) $ 23.46    
Exercise Price Range from Dollars 24.45 to Dollars 26.47 [Member]      
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) $ 28.67    
Exercise Price Range from Dollars 24.45 to Dollars 26.47 [Member] | Employee Stock Option      
Options Outstanding      
Number outstanding as of end of period (in shares) 0.5    
Weighted Average Remaining Contractual Life 2 years 22 days    
Weighted Average Exercise Price (in dollars per share) $ 26.24    
Aggregate Intrinsic Value (in millions) $ 3,600    
Options Exercisable      
Number Exercisable at the end of the period (in shares) 0.5    
Weighted Average Remaining Contractual Life 2 years 22 days    
Weighted Average Exercise Price (in dollars per share) $ 26.24    
Exercise Price Range from Dollars 30.96 to Dollars 34.00 [Member]      
Information concerning outstanding and exercisable options      
Exercise price, low end of range (in dollars per share) 30.96    
Exercise price, high end of range (in dollars per share) $ 34.00    
Exercise Price Range from Dollars 30.96 to Dollars 34.00 [Member] | Employee Stock Option      
Options Outstanding      
Number outstanding as of end of period (in shares) 0.7    
Weighted Average Remaining Contractual Life 9 years 2 months 1 day    
Weighted Average Exercise Price (in dollars per share) $ 31.65    
Aggregate Intrinsic Value (in millions) $ 800    
Options Exercisable      
Weighted Average Remaining Contractual Life 7 months 28 days    
Weighted Average Exercise Price (in dollars per share) $ 32.53