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BUSINESS REORGANIZATION (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
BUSINESS REORGANIZATION (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Mar. 31, 2024
Restructuring Cost and Reserve [Line Items]
Business reorganization	$ 16.8	$ 3.4	$ 66.3	$ 10.6
Reorganizing amounts paid	7.7		41.9
Accrued liabilities
Restructuring Cost and Reserve [Line Items]
Reorganization accrued expense	9.3		9.3
2024 Plan
Restructuring Cost and Reserve [Line Items]
Business reorganization	16.8		66.3		$ 93.3
2024 Plan \| Title cancellations
Restructuring Cost and Reserve [Line Items]
Business reorganization	10.3		33.6		88.2
2024 Plan \| Employee-related costs
Restructuring Cost and Reserve [Line Items]
Business reorganization	5.9		29.7		3.2
2024 Plan \| Impairment loss of ROU asset (office closures)
Restructuring Cost and Reserve [Line Items]
Business reorganization	0.6		2.4
2024 Plan \| Professional fees
Restructuring Cost and Reserve [Line Items]
Business reorganization	0.0		0.6		$ 1.9
2024 Plan \| Minimum
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	160.0		160.0
2024 Plan \| Minimum \| Title cancellations
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	120.0		120.0
2024 Plan \| Minimum \| Employee severance and employee-related costs
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	25.0		25.0
2024 Plan \| Minimum \| Office space reductions
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	15.0		15.0
2024 Plan \| Maximum
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	200.0		200.0
2024 Plan \| Maximum \| Title cancellations
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	140.0		140.0
2024 Plan \| Maximum \| Employee severance and employee-related costs
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	35.0		35.0
2024 Plan \| Maximum \| Office space reductions
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	$ 25.0		$ 25.0