BUSINESS COMBINATIONS - Narrative (Details) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Mar. 23, 2022	Jul. 31, 2022	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Business Acquisition [Line Items]
Amortization and acquisition-related costs			$ 15,291	$ 19,046	$ 15,172
Consideration paid for acquisition, net of cash acquired			$ 0	$ 267	$ 122,672
HooYu Ltd
Business Acquisition [Line Items]
Percentage of voting interests acquired (as a percent)	100.00%
Initial cash payment paid for acquisition	$ 129,100	$ 400
Fair value of earnout consideration	1,600
Amortization and acquisition-related costs	3,200
Payments to sellers and third-party legal and investment advisors	127,500
Consideration paid for acquisition, net of cash acquired	500
Goodwill expected to be deductible for income tax purposes	$ 0