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INCOME TAXES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
INCOME TAXES - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Operating loss carryforwards
Changes in valuation allowance	$ 135.3
Increase in interest and penalties	7.2	$ 14.8	$ 13.5
Gross amount of interest and penalties accrued	55.6	$ 48.4
Gross unrecognized tax benefits including interest and penalties	274.5
Gross unrealized tax benefits, which would affect effective tax rate, if realized	110.6
Increase in unrecognized tax benefits	7.4
Domestic
Operating loss carryforwards
Net operating loss carryforwards	1,077.8
Domestic \| Expire from 2027 to 2029
Operating loss carryforwards
Net operating loss carryforwards	34.9
Domestic \| Expire from 2030 to 2040
Operating loss carryforwards
Net operating loss carryforwards	205.1
Domestic \| Expire from 2041 to 2045
Operating loss carryforwards
Net operating loss carryforwards	339.8
Foreign tax effects
Operating loss carryforwards
Net operating loss carryforwards	356.4
Foreign tax effects \| Expire from 2027 to 2033
Operating loss carryforwards
Net operating loss carryforwards	272.8
Foreign tax effects \| Expire from 2042 to 2044
Operating loss carryforwards
Net operating loss carryforwards	14.6
Domestic tax jurisdiction
Operating loss carryforwards
Tax credit carryforward	514.8
Domestic tax jurisdiction \| Expire from 2039 to 2046
Operating loss carryforwards
Tax credit carryforward	159.1
Domestic tax jurisdiction \| Expire from 2034 to 2043
Operating loss carryforwards
Tax credit carryforward	$ 17.2