Marketable Securities (Tables)

12 Months Ended

Sep. 30, 2014

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, 2014 and 2013 (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
September 30, 2014:
U.S. Treasury securities and obligations of U.S. government agencies	$	26,052	$	1	$	(39	)	$	26,014
Corporate securities	74,614		23		(174		)	74,463
Mortgage-backed securities	964		36		—			1,000
Other debt securities	7,358		—		(10		)	7,348
Municipal securities	15,888		1		(16		)	15,873
Bank certificate of deposits	26,645		2		(3		)	26,644
	$	151,521	$	63	$	(242	)	$	151,342
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

Fair Value of Marketable Securities by Contractual Maturity

The fair value of the marketable securities at September 30, 2014 by contractual maturity, are shown below (in thousands). Expected maturities could 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	$	68,130
Due after one year through five years	79,885
Due after ten years	3,327
	$	151,342