Share-Based Compensation (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	9 Months Ended
	Jun. 30, 2012 Y M
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average recognition period (in years)	2.4
Outstanding options, maximum term (in years)	10
Vesting and restriction period, minimum (in months)	13
Per share weighted average fair value of stock options granted	$ 16.90
U.S. treasury security rate, number of years	5
Historical volatility figure, number of years	6
Number of years of historical data	10
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 7.1
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 14.8
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting and restriction period minimum (in years)	three
Vesting and restriction period maximum (in years)	four