Share-Based Payments (Details) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Share-Based Payments
Common stock approved for issuance under share-based compensation plan (in shares)		29,800,000
Share-based compensation expense	$ 22,107,000	$ 19,201,000	$ 16,852,000
Total income tax benefit recognized (in dollars)	8,200,000	7,100,000	6,200,000
Share-Based Payments
Accelerated expense related to certain retirement eligible employees (in dollars)	8,800,000	5,900,000	5,300,000
Executive management transition plan
Share-Based Payments
Accelerated expense related to certain retirement eligible employees (in dollars)	3,500,000
Stock Options
Share-Based Payments
Vesting period	4 years
Stock Options, Number of Outstanding Options
Outstanding at the beginning of the period (in shares)	10,408,000
Granted (in shares)	1,596,000	1,600,000	2,000,000
Exercised (in shares)	(2,727,000)
Forfeited or expired (in shares)	(294,000)
Outstanding at the end of the period (in shares)	8,983,000	10,408,000
Exercisable at the end of the period (in shares)	5,235,000
Stock Options, Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 12.89
Granted (in dollars per share)	$ 26.22
Exercised (in dollars per share)	$ 9.78
Forfeited or expired (in dollars per share)	$ 21.15
Outstanding at the end of the period (in dollars per share)	$ 15.93	$ 12.89
Exercisable at the end of the period (in dollars per share)	$ 12.10
Stock Options, Weighted Average Remaining Contractual Term
Outstanding at the beginning of the period	6 years 2 months 12 days	6 years 2 months 12 days
Outstanding at the end of the period	6 years 2 months 12 days	6 years 2 months 12 days
Exercisable at the end of the period	5 years 1 month 6 days
Stock Options, Aggregate Intrinsic Value
Outstanding at the beginning of the period (in dollars)	138,139,000
Outstanding at the end of the period (in dollars)	102,751,000	138,139,000
Exercisable at the end of the period (in dollars)	$ 79,950,000
Stock Options | Executive management transition plan
Stock Options, Number of Outstanding Options
Granted (in shares)	130,952,000
Stock Options | Maximum
Share-Based Payments
Term of stock options	10 years
Restricted Stock Awards | Executive management transition plan
Stock Options, Number of Outstanding Options
Granted (in shares)	210,820,000
Restricted Stock Awards | Maximum
Share-Based Payments
Vesting period	5 years
Restricted Stock Awards | Maximum | Executive management transition plan
Share-Based Payments
Vesting period	4 years