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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Current assets: |  |  |
Accounts receivable | $ 8,779 | $ (790) | $ (7,045)
Inventories | 830 | (2,869) | (2,289)
Other current assets | 10,317 | (16,293) | 4,447
Total change in current assets | 19,926 | (19,952) | (4,887)
Current liabilities: |  |  |
Trade accounts payable | 3,715 | 2,516 | 5,672
Accrued compensation | (8,832) | (10,940) | (2,469)
Accrued income taxes | (5,416) | (9,973) | 5,054
Other current liabilities | (21,875) | 28,415 | 2,414
Total change in current liabilities | (32,408) | 10,018 | 10,671
Net change | $ (12,482) | $ (9,934) | $ 5,784

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