Basis of Presentation Warranty (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning balance	$ 2,265	$ 1,843
Warranty expenditures	(1,260)	(847)
Warranty expense	2,266	2,061
Ending balance	$ 3,271	$ 3,057
Minimum [Member]
Product Warranty [Line Items]
Standard product warranty, period (in months)	12 months
Maximum [Member]
Product Warranty [Line Items]
Standard product warranty, period (in months)	24 months