Marketable Securities (Tables)

6 Months Ended

Mar. 31, 2013

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 March 31, 2013 and September 30, 2012 (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
March 31, 2013:
U.S. Treasury securities and obligations of U.S. government agencies	$	22,786	$	9	$	(1	)	$	22,794
Corporate securities	37,581		26		(32		)	37,575
Mortgage-backed securities	1,171		39		—			1,210
Other debt securities	62		—		—			62
Municipal securities	19,755		10		(2		)	19,763
Bank certificate of deposits	4,049		—		—			4,049
	$	85,404	$	84	$	(35	)	$	85,453
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

Fair Value of Marketable Securities by Contractual Maturity

The fair value of the marketable securities at March 31, 2013 by contractual maturity, are shown below (in thousands). Expected maturities will differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.

	Fair Value
Due in one year or less	$	46,242
Due after one year through five years	35,906
Due after ten years	3,305
	$	85,453