Segment Data and Related Information (Schedule of Long-lived Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Long-lived assets	$ 69,247	$ 72,287
Fiber Optics
Segment Reporting Information [Line Items]
Long-lived assets	21,490	23,804
Photovoltaics
Segment Reporting Information [Line Items]
Long-lived assets	39,408	40,048
Unallocated Corporate
Segment Reporting Information [Line Items]
Long-lived assets	$ 8,349	$ 8,435

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 41

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599

Name:	us-gaap_NoncurrentAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant