Amortized Cost, Unrealized Holding Gains (Losses) and Fair Value of Available-for-Sale Securities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 42,462	$ 42,186
Unrealized Gains	221	405
Unrealized Losses	(30)	(41)
Fair Value	42,653	42,550
U.S. government and government agency obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	34,318	28,641
Unrealized Gains	59	213
Unrealized Losses
Fair Value	34,377	28,854
Mortgage-backed Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,513	2,896
Unrealized Gains	112	129
Unrealized Losses	(24)	(26)
Fair Value	2,601	2,999
Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,421	3,178
Unrealized Gains	27	35
Unrealized Losses	(1)
Fair Value	3,447	3,213
Asset-backed Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	537	613
Unrealized Gains
Unrealized Losses	(5)	(15)
Fair Value	532	598
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,673	6,858
Unrealized Gains	23	28
Unrealized Losses
Fair Value	$ 1,696	$ 6,886

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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