Fair Value Measurements Available-For-Sale Securities (Detials) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Sep. 30, 2011
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	$ 56,681	$ 48,558
Available-for-sale Securities Gross Unrealized Gain	8,753	4,351
Available-for-sale Securities Gross Unrealized Losses 1	15	276
Available For Sale Securities Fair Value Disclosure	65,419	52,633
Money Market Funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	3,358	1,823
Available-for-sale Securities Gross Unrealized Gain	0	0
Available-for-sale Securities Gross Unrealized Losses 1	0	0
Available For Sale Securities Fair Value Disclosure	3,358	1,823
Equity Funds Domestic [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	24,471	27,748
Available-for-sale Securities Gross Unrealized Gain	7,821	4,074
Available-for-sale Securities Gross Unrealized Losses 1	0	0
Available For Sale Securities Fair Value Disclosure	32,292	31,822
Equity Funds Foreign [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	5,327	4,597
Available-for-sale Securities Gross Unrealized Gain	805	267
Available-for-sale Securities Gross Unrealized Losses 1	0	242
Available For Sale Securities Fair Value Disclosure	6,132	4,622
Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	23,525	14,390
Available-for-sale Securities Gross Unrealized Gain	127	10
Available-for-sale Securities Gross Unrealized Losses 1	15	34
Available For Sale Securities Fair Value Disclosure	$ 23,637	$ 14,366

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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