Cash Flows, Supplemental and Noncash Disclosures (Details) (USD $) In Thousands	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Supplemental Disclosures [Abstract]
Cash Paid For Interest	$ 505	$ 340	$ 173
Cash Paid for Income Taxes	21,302	19,850	15,251
Noncash Activities [Abstract]
Capital lease asset additions and related obligations	455	0	0
Equipment Acquisitions Financed With Accounts Payable	$ 124	$ 23	$ 119