Fair Value Measurements (Tables)

6 Months Ended

Mar. 31, 2014

Fair Value Disclosures [Abstract]

Assets Measured on Recurring Basis

The following table represents the Company’s fair value hierarchy for financial assets measured at fair value on a recurring basis:

	March 31, 2014		September 30, 2013
	(Level 1)		(Level 1)
	(In thousands)
Money market instruments (1)	$	19,320	$	19,318
Semiconductor Manufacturing International Corp.
(SMIC) common stock (2)	—		1,793
Nanya Technology Corporation (Nanya) common stock (2)	3,077		16,624
	$	22,397	$	37,735

(1) Included in cash and cash equivalents

(2) Included in short-term investments

Available-for-sale Securities

Available-for-sale marketable securities consisted of the following:

March 31, 2014	Amortized Cost			Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Fair Value
				(In thousands)
Money market instruments	$	19,320		$	—	$	—	$	19,320
Certificates of deposit	15,154			—		—		15,154
Nanya common stock	1,461			1,616		—		3,077
Total	35,935			1,616		—		37,551
Less: Amounts included in cash, cash
equivalents and restricted cash	(32,513		)	—		—		(32,513		)
	$	3,422		$	1,616	$	—	$	5,038
September 30, 2013	Amortized Cost			Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Fair Value
				(In thousands)
Money market instruments	$	19,318		$	—	$	—	$	19,318
Certificates of deposit	15,595			—		—		15,595
SMIC common stock	1,099			694		—		1,793
Nanya common stock	7,100			9,524		—		16,624
Total	43,112			10,218		—		53,330
Less: Amounts included in cash and cash
equivalents	(31,772		)	—		—		(31,772		)
	$	11,340		$	10,218	$	—	$	21,558