Share-Based Compensation - Narrative (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award
Weighted average recognition period	2 years 0 months 15 days
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Unrecognized compensation cost, stock options	$ 2.3
Outstanding options, maximum term	10 years
Stock Options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award
Employee, vesting period	1 year
Stock Options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Employee, vesting period	4 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award
Unrecognized compensation cost, restricted stock awards	$ 24.2
Restricted Stock | Minimum
Share-based Compensation Arrangement by Share-based Payment Award
Employee, vesting period	3 years
Employee, restriction period	3 years
Non-employee directors, award vesting period	13 months
Non-employee directors, award recognition period	13 months
Restricted Stock | Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Employee, vesting period	4 years
Employee, restriction period	4 years