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GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets Arising from Business Acquisitions (Details) - USD ($) $ in Thousands | Jun. 30, 2026 | Sep. 30, 2025
--- | --- | ---
Intangible Asset, Finite-Lived, Acquired [Line Items] |  |
Gross Carrying Amount | $ 561,495 | $ 561,441
Accumulated Amortization | (149,145) | (93,264)
Foreign Currency Translation Adjustment | 9,876 | 14,071
Net | $ 422,226 | $ 482,248
Developed technology |  |
Intangible Asset, Finite-Lived, Acquired [Line Items] |  |
Weighted Average Estimated Useful Lives | 14 years | 14 years
Gross Carrying Amount | $ 110,725 | $ 110,516
Accumulated Amortization | (53,232) | (47,278)
Foreign Currency Translation Adjustment | 455 | 649
Net | $ 57,948 | $ 63,887
Customer relationships |  |
Intangible Asset, Finite-Lived, Acquired [Line Items] |  |
Weighted Average Estimated Useful Lives | 9 years | 9 years
Gross Carrying Amount | $ 432,200 | $ 432,200
Accumulated Amortization | (91,002) | (42,077)
Foreign Currency Translation Adjustment | 9,190 | 13,093
Net | $ 350,388 | $ 403,216
Intellectual property |  |
Intangible Asset, Finite-Lived, Acquired [Line Items] |  |
Weighted Average Estimated Useful Lives | 13 years | 13 years
Gross Carrying Amount | $ 2,000 | $ 2,000
Accumulated Amortization | (941) | (821)
Foreign Currency Translation Adjustment | 0 | 0
Net | $ 1,059 | $ 1,179
Trade name |  |
Intangible Asset, Finite-Lived, Acquired [Line Items] |  |
Weighted Average Estimated Useful Lives | 13 years | 13 years
Gross Carrying Amount | $ 16,570 | $ 16,725
Accumulated Amortization | (3,970) | (3,088)
Foreign Currency Translation Adjustment | 231 | 329
Net | $ 12,831 | $ 13,966

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