Summary of Significant Accounting Policies (Warranty) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning balance	$ 2,265	$ 1,843	$ 1,429
Warranty expenditures	(1,831)	(1,199)	622
Warranty expense	2,253	1,621	1,036
Ending balance	$ 2,687	$ 2,265	$ 1,843
Minimum
Product Warranty [Line Items]
Standard Product Warranty, Period	12 months
Maximum
Product Warranty [Line Items]
Standard Product Warranty, Period	24 months