Financial Instruments and Fair Value Measurements (Financial Assets that are Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014
Total financial assets	$ 92,085	$ 124,932
Fair Value, Inputs, Level 1 [Member]
Total financial assets	92,085	124,932
Fair Value, Inputs, Level 2 [Member]
Total financial assets	0	0
Fair Value, Inputs, Level 3 [Member]
Total financial assets	0	0
Cash [Member]
Cash and cash equivalents	79,517	92,590
Cash [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	79,517	92,590
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	20	11,210
Investments in Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	20	11,210
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	2,665	11,487
Investments in Reverse Repurchase Agreements [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	2,665	11,487
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
Equity Securities [Member]
Equity securities	9,883	9,645
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Equity securities	9,883	9,645
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Equity securities	0	0
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Equity securities	$ 0	$ 0