Other Assets (Schedule of Other Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012		Mar. 31, 2012
Other Assets [Abstract]
Restricted assets	$ 340	$ 239
Deposits to foundry for capacity	657	3,500
Investment in Giantec	4,025	4,025
Other investments	1,840	2,000		2,000
Nanya common stock	0	14,752
Nanya private placement shares	10,845	11,042
Other	3,211	3,319
Other Assets	$ 20,918	$ 38,877	[1]

[1] Derived from audited financial statements.