Other Assets (Narrative) (Details) (USD $)	1 Months Ended	12 Months Ended				1 Months Ended		3 Months Ended		0 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2012 Pledged Nanya private placement shares	Aug. 31, 2011 Giantec Semiconductor, Inc	Aug. 31, 2011 Giantec Semiconductor, Inc	Dec. 31, 2010 Giantec Semiconductor, Inc	Dec. 30, 2010 Giantec Semiconductor, Inc	Dec. 30, 2010 Giantec Semiconductor, Inc	Sep. 30, 2012 Hong Kong
Entity Information [Line Items]
Purchases of available-for-sale securities	$ 27,109,000	$ 27,109,000	$ 0	$ 0
Termination period	1 year
Deposited private placement shares as collateral for accounts payable	11,042,000	11,042,000	0		7,100,000
Equity Method Investments	2,000,000	2,000,000	0
Ownership interest									44.00%		31.00%
Investment received from outside investors										4,000,000
Loss in equity method investment, Giantec								30,000
Ownership percentage sold in Giantec							37.00%
Proceeds from sale of equity method investments							$ 2,200,000
Sale of Giantec, percentage of ownership after transaction						19.85%