Schedule II (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Currency translation adjustments	$ 77	$ (934)	$ (704)
Allowance for Trade Receivables [Member]
Balance at Beginning of Year	3,841	7,078	8,872
Additions: Charged to Costs and Expenses	255	364	1,283
Additions: Charged to Other Accounts	233	487	916
Deductions	(1,789)	(4,088)	(3,993)
Balance at End of Year	2,540	3,841	7,078
Valuation Allowance of Deferred Tax Assets [Member]
Balance at Beginning of Year	6,804	9,486	11,783
Additions: Charged to Costs and Expenses	53	209	271
Additions: Charged to Other Accounts	0	0	0
Deductions	(3,540)	(2,891)	(2,568)
Balance at End of Year	$ 3,317	$ 6,804	$ 9,486