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INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Operating Loss Carryforwards [Line Items] |  |  |
Federal statutory tax rate | 24.50% | 35.00% | 35.00%
Provisional net tax benefit | $ 29,150 |  |
Tax benefit recognized during the year | 38,010 |  |
One-time transition tax expense | 8,860 |  |
Income tax expense (benefit) | (9,118) | $ 22,354 | $ 29,073
Foreign subsidiaries income before income taxes | 56,424 | 24,118 | $ 48,864
Undistributed earnings of foreign subsidiaries | 289,702 |  |
Valuation allowances | (14,137) | (20,866) |
Unrecognized tax benefits | 10,718 |  |
Change in unrecognized tax benefits | 2,786 |  |
Total penalties and interest accrued | 2,229 | $ 1,779 |
Capital Loss Carryforward |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Amount of tax credit carryforward | 20,370 |  |
Foreign Tax Authority |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Amount of operating loss carryforwards | 60,705 |  |
Amount of tax credit carryforward | 2,934 |  |
Domestic Tax Authority |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Amount of operating loss carryforwards | $ 4,684 |  |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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