STOCK-BASED COMPENSATION - Summary of PSUs, DSUs and RSUs Granted, Exercised, Forfeited and Expired (Detail) - shares	3 Months Ended		12 Months Ended
	Dec. 31, 2025	Sep. 30, 2024	Dec. 31, 2025	Dec. 31, 2024
Restricted Stock Units Time Based [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of units, Outstanding at the beginning			10,260,791	3,530,564
Granted	200,000		735,000	8,612,553
Vested or settled			(1,883,839)	(1,350,754)
Withheld to settle employee tax obligations			(421,185)	(351,672)
Forfeited or expired			(509,182)	(179,900)
Number of units, Outstanding at the end	8,181,585		8,181,585	10,260,791
Restricted Share Units ("RSUs") Performance-Based [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of units, Outstanding at the beginning			45,177	64,029
Granted		975,000
Vested or settled				(12,574)
Forfeited or expired			(45,177)	(6,278)
Number of units, Outstanding at the end	0		0	45,177
Performance Share Units ("PSUs") [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of units, Outstanding at the beginning			1,845,608	1,845,608
Granted			1,262,000
Forfeited or expired			(510,000)
Number of units, Outstanding at the end	2,597,608		2,597,608	1,845,608
Deferred Share Units ("DSUs") [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of units, Outstanding at the beginning			4,033,894	3,086,172
Granted			1,013,209	1,689,028
Vested or settled			(1,582,115)	(741,306)
Number of units, Outstanding at the end	3,464,988		3,464,988	4,033,894