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Basis of Presentation - Warranty (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning balance	$ 2,687	$ 2,265
Warranty expenditures	(362)	(330)
Warranty expense	103	378
Ending balance	$ 2,428	$ 2,313
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

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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