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GOODWILL AND INTANGIBLE ASSETS - Intangible assets (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
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Intangible Assets |  |
Gross Carrying Amount, Finite-lived | $ 79,700 | $ 51,000
Accumulated Amortization | 6,493 | 1,134
Net, Finite-lived | 73,207 | 49,866
Trademark |  |
Intangible Assets |  |
Indefinite-lived intangible asset |  | 919
Developed technology |  |
Intangible Assets |  |
Gross Carrying Amount, Finite-lived | 70,000 | 51,000
Accumulated Amortization | 5,589 | 1,134
Net, Finite-lived | 64,411 | $ 49,866
Trade name |  |
Intangible Assets |  |
Gross Carrying Amount, Finite-lived | 5,700 |
Accumulated Amortization | 237 |
Net, Finite-lived | 5,463 |
Customer relationships |  |
Intangible Assets |  |
Gross Carrying Amount, Finite-lived | 4,000 |
Accumulated Amortization | 667 |
Net, Finite-lived | $ 3,333 |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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