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EMPLOYEE BENEFIT PLANS - Recognized in balance sheet and accumulated other comprehensive income (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
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Amounts Recognized in the Consolidated Balance Sheets |  |
Accrued liabilities | $ (58) | $ (45)
Noncurrent liabilities-other | (11,250) | (17,115)
Net amount recognized | (11,308) | (17,160)
Amounts recognized in accumulated other comprehensive income and not yet reflected in net periodic benefit cost |  |
Net actuarial loss | (21,693) | $ (28,873)
Net actuarial loss, which is expected to be amortized in next year's periodic benefit cost | $ 1,200 |

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- Definition Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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