Investments (Tables)

9 Months Ended

Jun. 30, 2013

Investments Debt And Equity Securities [Abstract]

Amortized Cost, Unrealized Holding Gains (Losses) and Fair Value of Available-for-Sale Securities

The amortized cost, unrealized holding gains and losses, and fair value of available-for-sale securities as of June 30, 2013 and September 30, 2012 were as follows (in thousands):

	June 30, 2013
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
U.S. government and government agency obligations	$	28,260	$	15	$	(90	)	$	28,185
Mortgage-backed securities		5,180		92		(50	)		5,222
Municipal bonds		3,288		17		(6	)		3,299
Asset-backed securities		1,622		—		(8	)		1,614
Corporate bonds		4,115		12		(30	)		4,097
Total	$	42,465	$	136	$	(184	)	$	42,417

	September 30, 2012
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
U.S. government and government agency obligations	$	28,641	$	213	$	—		$	28,854
Mortgage-backed securities		2,896		129		(26	)		2,999
Municipal bonds		3,178		35		—			3,213
Asset-backed securities		613		—		(15	)		598
Corporate bonds		6,858		28		—			6,886
Total	$	42,186	$	405	$	(41	)	$	42,550

Amortized Cost and Fair Value of Investments by Contractual Maturity

The amortized cost and fair value of investments by contractual maturity at June 30, 2013 were as follows (in thousands):

	Amortized Cost		Fair Value
Debt securities due within:
One year	$	10,712	$	10,723
One to five years		25,080		25,000
Five years or more		6,673		6,694
Total	$	42,465	$	42,417

Sales of Available-for-Sale Securities

The following table summarizes sales of available-for-sale securities (in thousands):

	Three months ended June 30,						Nine months ended June 30,
	2013			2012			2013			2012
Proceeds from sales	$	8,507		$	649		$	34,487		$	35,203
Gross realized gains	$	6		$	3		$	171		$	174
Gross realized losses	$	(4	)	$	(1	)	$	(4	)	$	(2	)