Detail of Selected Balance Sheet Accounts (Activity in Product Warranty Accrual) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Detail of Selected Balance Sheet Accounts [Abstract]
Balance at beginning of period	$ 5,010	$ 5,610	$ 5,282	$ 5,548
Increase to warranty expense	1,042	810	1,505	1,495
Deduction for warranty charges	(1,196)	(1,230)	(1,926)	(1,851)
Increase (decrease) due to foreign currency translations	(23)	(81)	(28)	(83)
Balance at end of period	$ 4,833	$ 5,109	$ 4,833	$ 5,109