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Detail of Selected Balance Sheet Accounts (Activity in Product Warranty Accrual) (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Balance Sheet Related Disclosures [Abstract]    
Balance at beginning of period $ 4,930 $ 4,557
Increase to warranty expense 1,326 537
Deduction for warranty charges (1,100) (524)
Change in foreign currency translation (51) (90)
Balance at end of period $ 5,105 $ 4,480