Other Assets (Schedule of Other Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Sep. 30, 2013		Mar. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Restricted assets	$ 498	$ 811
Other investments	1,545	1,684		2,000
Nanya private placement shares	10,619	10,920
Other	1,146	1,162
Other Assets	23,191	16,579	[1]
Technology licenses, net
Finite-Lived Intangible Assets [Line Items]
Technology licenses, net	$ 9,383	$ 2,002

[1] Derived from audited financial statements.