Marketable Securities (Tables)

12 Months Ended

Sep. 30, 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 September 30, 2011 and 2010 (in thousands):

			Gross		Gross
	Amortized		Unrealized		Unrealized
	Cost		Gains		Losses			Fair Value
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)		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
September 30, 2010:
U.S. Treasury securities and obligations of U.S. government agencies	$	38,319	$	62	$	(8	)	$	38,373
Corporate securities		38,617		185		(4	)		38,798
Mortgage-backed securities(2)		1,771		23		(4	)		1,790
Other debt securities		186		—		—			186
Municipal securities		2,405		1		(2	)		2,404
Bank certificate of deposits		1,053		—		—			1,053
	$	82,351	$	271	$	(18	)	$	82,604

(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 $0.8 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 September 30, 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	$	65,695
Due after one year through five years		78,280
Due after ten years		3,010
	$	146,985