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LEASES - Lease Cost (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Lease, Cost [Abstract] |  |  |
Amortization of ROU assets | $ 5,104 | $ 2,791 | $ 3,816
Interest on lease liabilities | 808 | 248 | 205
Operating lease cost | 21,463 | 21,546 | 21,675
Variable lease cost | 10,960 | 10,601 | 10,486
Sublease income | (273) | (89) | (279)
Total lease cost | 38,062 | 35,097 | 35,903
Cash paid for finance and operating lease liabilities: |  |  |
Operating cash flows from finance leases | 824 | 259 | 211
Operating cash flows from operating leases | 28,121 | 27,194 | 27,648
Financing cash flows from finance leases | 5,055 | 2,642 | 3,691
ROU assets obtained in exchange for new finance lease liabilities | 17,720 | 4,745 | 1,516
ROU assets obtained in exchange for new operating lease liabilities | $ 7,577 | $ 8,294 | $ 10,365
Weighted Average Remaining Lease Term [Abstract] |  |  |
Weighted-average remaining lease term - finance leases (years) | 3 years 9 months | 4 years 5 months 19 days | 4 years 3 months 10 days
Weighted-average remaining lease term - operating leases (years) | 3 years 1 month 13 days | 3 years 6 months 7 days | 3 years 7 months 13 days
Weighted Average Discount Rate [Abstract] |  |  |
Weighted-discount rate - finance leases | 5.33% | 4.48% | 3.08%
Weighted-discount rate - operating leases | 4.19% | 3.47% | 2.45%

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- Definition Amount of interest expense on finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-4 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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- Definition Amount of cash outflow for principal payment on finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-5 + Details
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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