Employee Benefits (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
401(k) Retirement Plan [Member]
Employee Benefits (Textual) [Abstract]
Company's share of discretionary matching contributions	$ 0.7	$ 0.6	$ 0.5
Bonus Plan [Member]
Employee Benefits (Textual) [Abstract]
Consolidated pretax profits rate	14.50%
Recorded bonus expense	$ 5.7	$ 4.2	$ 3.3