Summary of Significant Accounting Policies (Supplemental Disclosures of Cash Flow Information) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Supplemental Cash Flow Information [Abstract]
Interest, net of interest income	$ 149	$ 164	$ 141
Income taxes, net of refunds	18,889	14,783	12,104
Non-cash capital expenditures	$ 13,527	$ 2,807