Marketable Securities (Tables)

9 Months Ended

Jun. 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 June 30, 2012 and September 30, 2011 (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
June 30, 2012:
U.S. Treasury securities and obligations of U.S. government agencies	$	46,046	$	11	$	(29	)	$	46,028
Corporate securities		61,967		95		(17	)		62,045
Mortgage-backed securities(1)		1,441		33		(5	)		1,469
Other debt securities		84		—		—			84
Municipal securities		29,724		16		(3	)		29,737
Bank certificate of deposits		2,740		1		—			2,741
	$	142,002	$	156	$	(54	)	$	142,104
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)		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

(1) Fair value amounts include approximately $0.7 million of investments in the Federal Home Loan Mortgage and Federal National Mortgage Association.

Fair Value of Marketable Securities by Contractual Maturity

The fair value of the marketable securities at June 30, 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	$	87,606
Due after one year through five years		50,650
Due after ten years		3,848
	$	142,104