Marketable Securities (Tables)

3 Months Ended

Dec. 31, 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 December 31, 2012 and September 30, 2012 (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
December 31, 2012:
U.S. Treasury securities and obligations of U.S. government agencies	$	30,303	$	14	$	—		$	30,317
Corporate securities		37,058		32		(19	)		37,071
Mortgage-backed securities		1,227		37		(1	)		1,263
Other debt securities		19		—		—			19
Municipal securities		15,047		9		—			15,056
Bank certificate of deposits		3,340		—		—			3,340
	$	86,994	$	92	$	(20	)	$	87,066
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 December 31, 2012 by contractual maturity, are shown below. 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	$	48,070
Due after one year through five years		35,276
Due after ten years		3,720
	$	87,066