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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Current assets:      
Accounts receivable $ (7,045) $ (10,632) $ 7,566
Inventories (2,289) 10,453 17,001
Other current assets 4,447 12,434 (14,567)
Total change in current assets (4,887) 12,255 10,000
Current liabilities:      
Trade accounts payable 5,672 (11,083) (9,103)
Accrued compensation (2,469) 147 (183)
Accrued income taxes 5,054 4,079 3,389
Other current liabilities 2,414 8,317 (6,854)
Total change in current liabilities 10,671 1,460 (12,751)
Net change $ 5,784 $ 13,715 $ (2,751)