Detail of Selected Balance Sheet Accounts (Activity in Allowance for Doubtful Accounts) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Balance Sheet Related Disclosures [Abstract]
Balance at beginning of period	$ 746	$ 1,577
Bad debt expense (recovery)	187	(29)	$ 1,074
Uncollectible accounts written off, net of recoveries	(120)	(749)
Change due to foreign currency translation	(2)	(53)
Balance at end of period	$ 811	$ 746	$ 1,577