Marketable Securities (Tables)

12 Months Ended

Sep. 30, 2013

Investments, Debt and Equity Securities [Abstract]

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, 2013 and 2012 (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
September 30, 2013:
U.S. Treasury securities and obligations of U.S. government agencies	$	19,528	$	6	$	(13	)	$	19,521
Corporate securities	35,045		11		(47		)	35,009
Mortgage-backed securities	1,093		25		(1		)	1,117
Other debt securities	88		—		—			88
Municipal securities	25,199		15		(7		)	25,207
Bank certificate of deposits	9,451		—		(2		)	9,449
	$	90,404	$	57	$	(70	)	$	90,391
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 September 30, 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	$	45,900
Due after one year through five years	41,194
Due after ten years	3,297
	$	90,391