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INCOME TAXES - Changes in Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Balance, beginning of year | $ 14,827 | $ 7,968 | $ 13,820
Increases for tax positions of prior years | 0 | 7,886 | 839
Decreases for tax positions of prior years | 0 | 0 | (5,890)
Increases based on tax positions related to the current year | 1,420 | 882 | 378
Decreases due to lapse of statute of limitation | (721) | (1,909) | (1,179)
Balance, end of year | $ 15,526 | $ 14,827 | $ 7,968

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=116821951&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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