Marketable Securities (Tables)

6 Months Ended

Mar. 31, 2015

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 March 31, 2015 and September 30, 2014 (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
March 31, 2015:
U.S. Treasury securities and obligations of U.S. government agencies	$	27,402	$	17	$	(2	)	$	27,417
Corporate securities	61,377		26		(38		)	61,365
Mortgage-backed securities	911		30		—			941
Other debt securities	6,270		2		—			6,272
Municipal securities	19,936		2		(14		)	19,924
Bank certificate of deposits	16,946		1,063		—			18,009
	$	132,842	$	1,140	$	(54	)	$	133,928
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

Fair Value of Marketable Securities by Contractual Maturity

The fair value of the marketable securities at March 31, 2015 by contractual maturity, are shown below (in thousands):

	Fair Value
Due in one year or less	$	69,327
Due after one year through five years	61,247
Due after ten years	3,354
	$	133,928