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Accrued Liabilities (Warranties) (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Accrued Liabilities    
Warranties, beginning of period $ 16,916us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 15,224us-gaap_ProductWarrantyAccrualClassifiedCurrent
Warranty Expense 3,922us-gaap_ProductWarrantyExpense 5,333us-gaap_ProductWarrantyExpense
Reductions for settling warranties (5,965)us-gaap_ProductWarrantyAccrualPayments (4,317)us-gaap_ProductWarrantyAccrualPayments
Foreign currency exchange rate changes (866)us-gaap_ProductWarrantyAccrualCurrencyTranslationIncreaseDecrease 178us-gaap_ProductWarrantyAccrualCurrencyTranslationIncreaseDecrease
Warranties, end of period $ 14,007us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 16,418us-gaap_ProductWarrantyAccrualClassifiedCurrent