Share-Based Payments (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended				12 Months Ended	9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Stock Options	Jun. 30, 2012 Stock Options	Sep. 30, 2012 Stock Options	Jun. 30, 2013 Stock Options Maximum
Share-Based Payments
Accelerated share-based compensation expense related to certain retirement eligible employees (in dollars)			$ 5,900,000	$ 5,300,000
Share-based compensation expense (in dollars)	3,190,000	2,825,000	15,503,000	13,801,000
Income tax benefit related to share-based compensation expense (in dollars)	1,161,000	674,000	5,731,000	4,933,000
Share-Based Payments
Term of stock options								10 years
Vesting period					4 years
Stock Options, Number of Outstanding Options
Outstanding at the beginning of the period (in shares)					11,861
Granted (in shares)					1,578	2,000
Exercised (in shares)					(2,224)
Forfeited or expired (in shares)					(72)
Outstanding at the end of the period (in shares)					11,143		11,861
Exercisable at the end of the period (in shares)					6,137
Stock Options, Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)					$ 10.45
Granted (in dollars per share)					$ 23.49
Exercised (in dollars per share)					$ 8.42
Forfeited or expired (in dollars per share)					$ 17.97
Outstanding at the end of the period (in dollars per share)					$ 12.66		$ 10.45
Exercisable at the end of the period (in dollars per share)					$ 9.24
Stock Options, Weighted Average Remaining Contractual Term
Outstanding at the beginning of the period					6 years 4 months 24 days		6 years 6 months
Outstanding at the end of the period					6 years 4 months 24 days		6 years 6 months
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)					173,601,000
Outstanding at the end of the period (in dollars)					205,514,000		173,601,000
Exercisable at the end of the period (in dollars)					$ 134,131,000