Detail of Selected Balance Sheet Accounts (Activity in Allowance for Doubtful Accounts) (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	$ 1,010	$ 1,844	$ 746	$ 1,577
Bad debt expense	92	186	339	469
Uncollectible accounts written off, net of recoveries	(141)	(120)	(114)	(122)
Change in foreign currency translation	15	(29)	5	(43)
Balance at end of period	$ 976	$ 1,881	$ 976	$ 1,881