Other Assets (Schedule of Other Assets) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Restricted assets	$ 499	$ 811
Other investment	1,436	1,684	2,000
Nanya private placement shares	10,645	10,920
Other	1,145	1,162
Other assets	24,369	16,579
Technology licenses, net
Finite-Lived Intangible Assets [Line Items]
Technology licenses, net	$ 10,644	$ 2,002