Income Taxes (Details) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Income tax
Income tax expense	$ 3,574,000	$ 3,924,000	$ 661,000
Reported income tax rate (as a percent)	18.00%	32.00%	(3.00%)
Reversal of unrecognized tax benefits in discontinued operations resulting from IRS audit		2,700,000
Net operating and capital loss carryforwards	70,300,000
Tax credit carryforwards	$ 24,800,000
Minimum
Income tax
Carryover period for deferred tax attributes	20 years
Operating loss carryforwards expiration date	Sep. 30, 2015
Tax credit carryforwards, expiration date	Sep. 30, 2028
Maximum
Income tax
Operating loss carryforwards expiration date	Sep. 30, 2034
Tax credit carryforwards, expiration date	Sep. 30, 2034