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	Mar. 31, 2014	Sep. 30, 2013
Equity securities	$ 9,502	$ 8,285
Total financial assets	66,167	56,841
Fair Value, Inputs, Level 1 [Member]
Equity securities	9,502	8,285
Total financial assets	66,167	56,841
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	36,512	35,839
Cash [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	36,512	35,839
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	10,078	2,950
Investments in Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	10,078	2,950
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	10,075	9,767
Investments in Reverse Repurchase Agreements [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	10,075	9,767
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