Marketable Securities (Tables)

12 Months Ended

Sep. 30, 2012

Summary of Marketable Securities Including Accrued Interest Receivable

The following is a summary of marketable securities (included in short and long-term marketable securities in the consolidated balance sheets), including accrued interest receivable, as of September 30, 2012 and 2011 (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
September 30, 2012:
U.S. Treasury securities and obligations of U.S. government agencies	$	41,202	$	15	$	(2	)	$	41,215
Corporate securities		64,102		138		(16	)		64,224
Mortgage-backed securities		1,310		42		(1	)		1,351
Other debt securities		13		—		—			13
Municipal securities		34,777		25		(1	)		34,801
Bank certificate of deposits		3,987		1		—			3,988
	$	145,391	$	221	$	(20	)	$	145,592
September 30, 2011:
U.S. Treasury securities and obligations of U.S. government agencies	$	53,342	$	17	$	(21	)	$	53,338
Corporate securities		66,045		50		(203	)		65,892
Mortgage-backed securities		1,576		26		(53	)		1,549
Other debt securities		434		—		—			434
Municipal securities		24,125		9		(17	)		24,117
Bank certificate of deposits		1,655		—		—			1,655
	$	147,177	$	102	$	(294	)	$	146,985

Fair Value of Marketable Securities by Contractual Maturity

The fair value of the marketable securities at September 30, 2012 by contractual maturity, are shown below. The following expected maturities will differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties (in thousands):

	Fair Value
Due in one year or less	$	85,646
Due after one year through five years		56,148
Due after ten years		3,798
	$	145,592