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GOODWILL AND INTANGIBLE ASSETS - Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2022
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, cost | $ 320,854 |  |
Finite-lived intangible assets, accumulated amortization | (93,681) |  |
Finite-lived intangible assets, carrying value | 227,173 |  |
Total identifiable intangible assets, cost | 320,898 |  |
Total identifiable intangible assets, carrying value | 227,217 |  | $ 195,919
Amortization expense of intangible assets | 5,059 | $ 4,178 |
Trademarks |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets | 44 |  |
Merchant relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, cost | 303,581 |  |
Finite-lived intangible assets, accumulated amortization | (85,003) |  |
Finite-lived intangible assets, carrying value | $ 218,578 |  |
Merchant relationships | Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization life | 9 years |  |
Merchant relationships | Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization life | 25 years |  |
Non-compete agreements |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, cost | $ 1,390 |  |
Finite-lived intangible assets, accumulated amortization | (816) |  |
Finite-lived intangible assets, carrying value | $ 574 |  |
Non-compete agreements | Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization life | 3 years |  |
Non-compete agreements | Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization life | 6 years |  |
Website and brand development costs |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, cost | $ 267 |  |
Finite-lived intangible assets, accumulated amortization | (177) |  |
Finite-lived intangible assets, carrying value | $ 90 |  |
Website and brand development costs | Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization life | 3 years |  |
Website and brand development costs | Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization life | 4 years |  |
Trade names |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, cost | $ 8,371 |  |
Finite-lived intangible assets, accumulated amortization | (4,578) |  |
Finite-lived intangible assets, carrying value | $ 3,793 |  |
Trade names | Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization life | 3 years |  |
Trade names | Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization life | 7 years |  |
Residual buyouts |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, cost | $ 6,445 |  |
Finite-lived intangible assets, accumulated amortization | (2,334) |  |
Finite-lived intangible assets, carrying value | $ 4,111 |  |
Amortization life | 8 years |  |
Referral and exclusivity agreements |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, cost | $ 800 |  |
Finite-lived intangible assets, accumulated amortization | (773) |  |
Finite-lived intangible assets, carrying value | $ 27 |  |
Amortization life | 5 years |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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