Fair Value Measurements Available-For-Sale Securities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 55,339	$ 48,558
Gross Unrealized Gain	9,061	4,351
Gross Unrealized Loss	2	276
Fair value	64,398	52,633
Equity Funds, Domestic [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	25,779	27,748
Gross Unrealized Gain	8,183	4,074
Gross Unrealized Loss	0	0
Fair value	33,962	31,822
Equity Funds, Foreign [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	5,568	4,597
Gross Unrealized Gain	682	267
Gross Unrealized Loss	0	242
Fair value	6,250	4,622
Money Market Funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,634	1,823
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Fair value	1,634	1,823
Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	22,358	14,390
Gross Unrealized Gain	196	10
Gross Unrealized Loss	2	34
Fair value	$ 22,552	$ 14,366

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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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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