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, 2014	Sep. 30, 2013
Equity securities	$ 9,645	$ 8,285
Total financial assets	124,932	56,841
Fair Value, Inputs, Level 1 [Member]
Equity securities	9,645	8,285
Total financial assets	124,932	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	92,590	35,839
Cash [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	92,590	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	11,210	2,950
Investments in Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	11,210	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	11,487	9,767
Investments in Reverse Repurchase Agreements [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	11,487	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