Cash Flows, Supplemental and Noncash Disclosures (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Supplemental Disclosures [Abstract]
Cash Paid For Interest	$ 382	$ 368
Cash Paid for Income Taxes	16,829	14,110
Noncash Activities [Abstract]
Issuance Of Restricted Common Stock For Asset Acquisition	0	7,158
Capital lease asset additions and related obligations	0	140
Equipment Acquisitions Financed With Accounts Payable	$ 391	$ 201