Employee Benefits - Stock Options Outstanding (Details) (USD $)	6 Months Ended
	Mar. 31, 2015
Options granted and outstanding (in shares)	1,622,116
Exercise Price $8.82
Options granted and outstanding (in shares)	387,922
Weighted average remaining contractual life in years	4 years
Exercise price per share (in Dollars per share)	$ 8.82
Exercise Price $8.18
Options granted and outstanding (in shares)	174,594
Weighted average remaining contractual life in years	5 years
Exercise price per share (in Dollars per share)	$ 8.18
Exercise Price $7.22
Options granted and outstanding (in shares)	66,720
Weighted average remaining contractual life in years	6 years
Exercise price per share (in Dollars per share)	$ 7.22
Exercise Price $7.34
Options granted and outstanding (in shares)	16,212
Weighted average remaining contractual life in years	7 years
Exercise price per share (in Dollars per share)	$ 7.34
Exercise Price $7.79
Options granted and outstanding (in shares)	4,988
Weighted average remaining contractual life in years	7 years
Exercise price per share (in Dollars per share)	$ 7.79
Exercise Price $10.89
Options granted and outstanding (in shares)	971,680
Weighted average remaining contractual life in years	9 years
Exercise price per share (in Dollars per share)	$ 10.89