Fair Value Measurements (Tables)

6 Months Ended

Mar. 31, 2013

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, 2013		September 30, 2012
	(Level 1)		(Level 1)
	(In thousands)
Money market instruments (1)	$	19,313	$	34,317
Semiconductor Manufacturing International Corp.
(SMIC) common stock (2)	1,771		1,099
Nanya Technology Corporation (Nanya) common stock (3)	27,324		14,752
	$	48,408	$	50,168

(1) Included in cash and cash equivalents

(2) Included in short-term investments

(3) Included in short-term investments at March 31, 2013 and other assets at September 30, 2012.

Available-for-sale Securities

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

March 31, 2013	Amortized Cost			Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Fair Value
				(In thousands)
Money market instruments	$	19,313		$	—	$	—		$	19,313
Certificates of deposit	15,288			—		—			15,288
SMIC common stock	1,099			672		—			1,771
Nanya common stock	13,676			13,648		—			27,324
Total	49,376			14,320		—			63,696
Less: Amounts included in cash, cash equivalents
and restricted cash	(29,333		)	—		—			(29,333		)
	$	20,043		$	14,320	$	—		$	34,363
September 30, 2012	Amortized Cost			Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Fair Value
				(In thousands)
Money market instruments	$	34,317		$	—	$	—		$	34,317
Certificates of deposit	18,302			—		—			18,302
SMIC common stock	1,099			—		—			1,099
Nanya common stock	16,587			—		(1,835		)	14,752
Total	70,305			—		(1,835		)	68,470
Less: Amounts included in cash, cash equivalents
and restricted cash	(47,177		)	—		—			(47,177		)
	$	23,128		$	—	$	(1,835	)	$	21,293