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Basis of Presentation - Warranty (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Movement in Standard Product Warranty Accrual [Roll Forward]    
Beginning balance $ 2,687 $ 2,265
Warranty expenditures (791) (658)
Warranty expense 169 1,079
Ending balance $ 2,065 $ 2,686
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