Significant Accounting Policies (Fair Value Measurements) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Level 1
Assets:
Money market funds	$ 51,983	$ 41,937
Total	51,983	41,937
Liabilities:
Long-term debt	0	0
Total	0	0
Level 2
Assets:
Money market funds	0	0
Total	0	0
Liabilities:
Long-term debt	31,450	33,300
Total	31,450	33,300
Level 3
Assets:
Money market funds	0	0
Total	0	0
Liabilities:
Long-term debt	0	0
Total	0	0
Total
Assets:
Money market funds	51,983	41,937
Total	51,983	41,937
Liabilities:
Long-term debt	31,450	33,300
Total	$ 31,450	$ 33,300