Cash Flows, Supplemental and Noncash Disclosures (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Supplemental Disclosures [Abstract]
Cash Paid For Interest	$ 788	$ 505	$ 340
Cash Paid for Income Taxes	31,025	21,302	19,850
Noncash Activities [Abstract]
Issuance Of Restricted Common Stock For Asset Acquisition	7,158	0	0
Capital lease asset additions and related obligations	165	455	0
Equipment Acquisitions Financed With Accounts Payable	$ 192	$ 124	$ 23