Property, Plant, and Equipment - Net (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Dec. 31, 2011 sqft	Sep. 30, 2011
Size of system test facility, in square feet	48,000
Construction in progress	$ 38,616	$ 44,975
System Test Facility [Member]
Contruction in progress placed into service	16,738
Construction in progress	4,503
Enterprise Resource Planning system [Member]
Construction in progress	14,111	11,827
Capitalized interest	$ 627	$ 432

Gross amount, at the balance sheet date, of long-lived assets under construction that include construction costs to date on capital projects that have not been completed and assets being constructed that are not ready to be placed into service.

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 5

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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