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	Jun. 30, 2013	Sep. 30, 2012
Cash and cash equivalents	$ 60,972	$ 61,829
Total financial assets	69,416	69,145
Treasury lock agreement	546	0
Fair Value, Inputs, Level 1 [Member]
Total financial assets	68,870	69,145
Fair Value, Inputs, Level 2 [Member]
Total financial assets	546	0
Cash [Member]
Cash and cash equivalents	30,306	32,688
Cash [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	30,306	32,688
Investments in Money Market Funds [Member]
Cash and cash equivalents	15,753	14,791
Investments in Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	15,753	14,791
Investments in Reverse Repurchase Agreements [Member]
Cash and cash equivalents	14,913	14,350
Investments in Reverse Repurchase Agreements [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	14,913	14,350
Equity Securities [Member]
Equity securities	7,898	7,316
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Equity securities	7,898	7,316
Treasury Lock [Member]
Treasury lock agreement	546	0
Treasury Lock [Member] | Fair Value, Inputs, Level 2 [Member]
Treasury lock agreement	$ 546	$ 0