Stockholders' Equity - Additional Information (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Stockholders' Equity (Textual) [Abstract]
Common stock split conversion ratio	2
Stockholders' Equity Additional (Textual) [Abstract]
Nonqualified stock options vested	0	106,500	102,500
Fair values of nonqualified stock options vested	$ 0	$ 0.8	$ 0.7
Intrinsic value of nonqualified stock options exercised	0.7	10.4	4.0
Unvested nonqualified stock options	0
Restricted Stock
Stockholders' Equity (Textual) [Abstract]
Unrecognized compensation expense	$ 13.3
1997 Plan
Stockholders' Equity (Textual) [Abstract]
Common stock reserved for issuance	2,250,000
Expiration date	Nov. 14, 2017
Percent of outstanding common stock granted to employees	10.00%
Exercise price of stock option granted to employees	110.00%
Increments in option	25.00%
Vesting Period for Option from date of grant	4 years
Common stock available for issuance	0
1997 Plan | Restricted Stock
Stockholders' Equity (Textual) [Abstract]
Restriction period for continuing to hold restricted stock	10 years
1997 Plan | Maximum
Stockholders' Equity (Textual) [Abstract]
Options have a term	10 years
Outstanding shares of common stock granted to employees expiry term	5 years
2014 Plan
Stockholders' Equity (Textual) [Abstract]
Common stock reserved for issuance	1,500,000
Percent of outstanding common stock granted to employees	10.00%
Exercise price of stock option granted to employees	110.00%
Common stock available for issuance	1,487,000
2014 Plan | Maximum
Stockholders' Equity (Textual) [Abstract]
Options have a term	10 years
Outstanding shares of common stock granted to employees expiry term	5 years