Share-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended					6 Months Ended
	Mar. 31, 2013 plan	Mar. 31, 2013 Stock Options [Member]	Mar. 31, 2013 Restricted Stock [Member]	Dec. 07, 2012 2013 Long-Term Incentive Plan [Member]	Dec. 07, 2012 2007 Long-Term Incentive Plan [Member]	Mar. 31, 2013 2007 Long-Term Incentive Plan [Member] Restricted Stock [Member]	Mar. 31, 2013 2007 Long-Term Incentive Plan [Member] Restricted Stock [Member] Minimum [Member]	Mar. 31, 2013 2007 Long-Term Incentive Plan [Member] Restricted Stock [Member] Maximum [Member]	Dec. 07, 2012 2001 Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost		$ 5.0	$ 22.5
Weighted average recognition period (in years)	2 years 2 months 12 days
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized				2,200,000	4,000,000				4,000,000
Number of other stock incentive plans	2
Outstanding options, maximum term (in years)	10 years
Vesting and restriction period							3 years	4 years
Award vesting and restricted period minimum						13 months