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Basis of Presentation - Warranty (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Movement in Standard Product Warranty Accrual [Roll Forward]    
Beginning balance $ 628us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 1,454us-gaap_ProductWarrantyAccrualClassifiedCurrent
Warranty expenditures (228)us-gaap_StandardProductWarrantyAccrualPayments (277)us-gaap_StandardProductWarrantyAccrualPayments
Warranty provisions/(adjustment) 307us-gaap_StandardProductWarrantyAccrualPreexistingIncreaseDecrease (112)us-gaap_StandardProductWarrantyAccrualPreexistingIncreaseDecrease
Ending balance $ 707us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 1,065us-gaap_ProductWarrantyAccrualClassifiedCurrent
Minimum    
Product Warranty [Line Items]    
Standard product warranty, period (in months) 12 months  
Maximum    
Product Warranty [Line Items]    
Standard product warranty, period (in months) 24 months