Statements of Cash Flows - Supplemental and Noncash Disclosures (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Statements of Cash Flows — Supplemental and Noncash Disclosures [Abstract]
Cash Paid For Interest	$ 620	$ 788	$ 505
Cash Paid for Income Taxes	34,045	31,025	21,302
Issuance of restricted common stock for asset acquisition		7,158
Capital lease asset additions and related obligations		165	455
Equipment acquisitions financed with accounts payable	$ 265	$ 192	$ 124