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SUBSEQUENT EVENTS (Details) $ in Thousands			9 Months Ended
SUBSEQUENT EVENTS (Details) $ in Thousands	Oct. 31, 2025 USD ($)	Oct. 27, 2025 boardManager	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Oct. 22, 2025 USD ($)
Subsequent Event [Line Items]
Proceeds from issuance of convertible notes, net of issuance costs paid of $24,671 and $0			$ 975,329	$ 0
Subsequent Events \| FS CS I LLC \| Big Country Wulf LLC
Subsequent Event [Line Items]
Equity interests		50.10%
Number of board managers \| boardManager		3
Adjusted equity interest		51.00%
Subsequent Events \| FS CS I LLC \| Fluidstack CS I Inc.
Subsequent Event [Line Items]
Equity interests		49.90%
Number of board managers \| boardManager		2
7.750% Senior Secured Notes due 2030 \| Senior Notes \| Subsequent Events
Subsequent Event [Line Items]
Loan amount					$ 3,200,000
Interest rate					7.75%
Convertible Senior Notes due 2032 \| Convertible Debt \| Subsequent Events
Subsequent Event [Line Items]
Loan amount	$ 1,025,000
Interest rate	0.00%
Option additional principal amount	$ 125,000
Debt instrument, redemption price, percentage	100.00%
Proceeds from issuance of convertible notes, net of issuance costs paid of $24,671 and $0	$ 999,400