ACQUISITIONS - Narrative (Details) $ in Thousands			6 Months Ended
	Feb. 07, 2025 USD ($) destination broker global_market	Nov. 05, 2024 USD ($)	Feb. 28, 2026 USD ($)	Feb. 28, 2025 USD ($)	Aug. 31, 2025 USD ($)
Business Combination [Line Items]
Purchase price			$ 0	$ 342,461
Contingent consideration			13,080		$ 24,126
Goodwill			$ 1,287,221		$ 1,284,708
Liquid Holdings, LLC ("LiquidityBook")
Business Combination [Line Items]
Purchase price	$ 243,200
Contingent consideration	$ 11,900
Trading solutions, number of brokers | broker	200
Trading solutions, number of destinations | destination	1,600
Trading solutions, number of global markets | global_market	80
Goodwill	$ 164,787
Platform Group Limited ("Irwin")
Business Combination [Line Items]
Purchase price		$ 120,200
Contingent consideration		9,600
Goodwill		$ 91,376