Detail of Selected Balance Sheet Accounts (Activity in Product Warranty Accrual) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Balance Sheet Related Disclosures [Abstract]
Balance at beginning of period	$ 5,105	$ 4,480	$ 4,930	$ 4,557
Increase to warranty expense	832	530	2,158	1,067
Deduction for warranty charges	(1,175)	(504)	(2,275)	(1,028)
Change in foreign currency translation	25	(131)	(26)	(221)
Balance at end of period	$ 4,787	$ 4,375	$ 4,787	$ 4,375