Fair Value Measurements (Tables)

12 Months Ended

Sep. 30, 2012

Fair Value Measurements [Abstract]

Schedule of assets and liabilities measured at fair value on a recurring basis

	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value as of September 30, 2012
Assets:
Cash equivalents	$	—	$	5,101	$	—	$	5,101
Available-for-sale debt securities:
U.S. government and government agency obligations		—		28,854		—		28,854
Mortgage-backed securities		—		2,999		—		2,999
Municipal bonds		—		3,213		—		3,213
Asset-backed securities		—		598		—		598
Corporate bonds		—		6,886		—		6,886
Other assets		718		—		—		718
Total assets measured at fair value	$	718	$	47,651	$	—	$	48,369

	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value as of September 30, 2011
Assets:
Cash equivalents	$	—	$	8,419	$	—	$	8,419
Available-for-sale debt securities:
U.S. government and government agency obligations		—		30,603		—		30,603
Mortgage-backed securities		—		3,933		15		3,948
Municipal bonds		—		3,614		—		3,614
Asset-backed securities		—		1,279		9		1,288
Corporate bonds		—		2,497		—		2,497
Other assets		1,190		—		—		1,190
Total assets measured at fair value	$	1,190	$	50,345	$	24	$	51,559

Schedule of assets measured at fair value on a recurring basis using Significant unobservable inputs (Level 3)

	Fair Value Measurements Using Significant Unobservable Inputs (Level  3) For the Year Ended September 30, 2012 Available-for-Sale Debt Securities
	Mortgage- Backed  Securities			Asset- Backed  Securities			Total
Balance at September 30, 2011	$	15		$	9		$	24
Transfers into/out of Level 3		(15	)		(9	)		(24	)
Total realized and unrealized gains (losses):
Included in other comprehensive income (loss)		—			—			—
Purchases		—			—			—
Issuances		—			—			—
Sales		—			—			—
Settlements		—			—			—
Balance at September 30, 2012	$	—		$	—		$	—

	Fair Value Measurements Using Significant Unobservable Inputs (Level  3) For the Year Ended September 30, 2011 Available-for-Sale Debt Securities
	U.S.  Government Obligations			Mortgage- Backed  Securities			Asset- Backed  Securities			Total
Balance at September 30, 2010	$	704		$	69		$	—		$	773
Transfers into Level 3		—			17			14			31
Transfers out of Level 3		(695	)		(68	)		—			(763	)
Total realized and unrealized gains (losses):
Included in other comprehensive income (loss)		19			(3	)		(3	)		13
Purchases		—			620			—			620
Issuances		—			—			—			—
Sales		(28	)		(620	)		(2	)		(650	)
Settlements		—			—			—			—
Balance at September 30, 2011	$	—		$	15		$	9		$	24