Retirement Plan (Schedule of Net Periodic Benefit Cost) (Details) (Pension Plans, Defined Benefit, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 195	$ 165	$ 94
Interest cost	108	83	46
Expected return on plan assets	(44)	(40)	(38)
Amortization of deferred amount	36	2	(58)
Net periodic benefit cost	$ 295	$ 210	$ 44