Marketable Securities (Tables)

3 Months Ended

Dec. 31, 2011

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, 2011 and September 30, 2011 (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
December 31, 2011:
U.S. Treasury securities and obligations of U.S. government agencies	$	46,055	$	25	$	(5	)	$	46,075
Corporate securities		70,567		60		(152	)		70,475
Mortgage-backed securities(1)		1,522		21		(52	)		1,491
Other debt securities		262		—		—			262
Municipal securities		24,028		13		(10	)		24,031
Bank certificate of deposits		2,956		1		—			2,957
	$	145,390	$	120	$	(219	)	$	145,291
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(2)		786		26		(3	)		809
Other debt securities		434		—		—			434
Municipal securities		24,915		9		(67	)		24,857
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.

(2) 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 December 31, 2011 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	$	79,465
Due after one year through five years		62,035
Due after ten years		3,791
	$	145,291