Financial Instruments and Fair Value Measurements (Financial Assets that are Measured at Fair Value on a Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Equity securities	$ 8,285	$ 7,316
Total financial assets	56,841	69,145
Fair Value, Inputs, Level 1 [Member]
Equity securities	8,285	7,316
Total financial assets	56,841	69,145
Fair Value, Inputs, Level 2 [Member]
Equity securities	0	0
Total financial assets	0	0
Fair Value, Inputs, Level 3 [Member]
Equity securities	0	0
Total financial assets	0	0
Cash [Member]
Cash and cash equivalents	35,839	32,688
Cash [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	35,839	32,688
Cash [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0	0
Cash [Member] | Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	0	0
Investments in Money Market Funds [Member]
Cash and cash equivalents	2,950	14,791
Investments in Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	2,950	14,791
Investments in Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0	0
Investments in Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	0	0
Investments in Reverse Repurchase Agreements [Member]
Cash and cash equivalents	9,767	14,350
Investments in Reverse Repurchase Agreements [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	9,767	14,350
Investments in Reverse Repurchase Agreements [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0	0
Investments in Reverse Repurchase Agreements [Member] | Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	$ 0	$ 0