Accumulated Other Comprehensive Income (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated foreign currency translation adjustments	$ 3,565	$ 4,787
Accumulated net retirement plan transition asset (net of tax of $148 and $148, respectively)	32	47
Accumulated net retirement plan actuarial losses (net of tax of $470 and $470, respectively)	(2,064)	(2,091)
Total accumulated other comprehensive income	5,266	9,121	[1]
Accumulated net retirement plan transition asset, tax	148	148
Accumulated net retirement plan actuarial losses, tax	470	470
Semiconductor Manufacturing International Corp.
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated net unrealized gain	756	419
Accumulated unrealized gain, tax	496	275
Nanya Technology Corporation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated net unrealized gain	2,977	5,959
Accumulated unrealized gain, tax	$ 1,720	$ 3,565

[1] Derived from audited financial statements.