Recent Accounting Pronouncements (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Recent Accounting Pronouncements
Rent expense for all operating leases	$ 7,359	$ 7,299	$ 10,897
Future minimum rental payments required under operating leases	15,612
Balance of unamortized debt issuance costs	$ 2,091	$ 1,512