STOCK-BASED COMPENSATION - Schedule of Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Stock-based compensation expense
Stock-based compensation expense before income taxes	$ 305.3	$ 324.0	$ 335.6
(Benefit from) provision for for income taxes	2.8	(6.5)	(12.2)
Stock-based compensation expense, net of income tax benefit	308.1	317.5	323.4
Capitalized stock-based compensation expense	98.0	81.4	85.4
Location, Statement of Income, Balance [Axis]: us-gaap:CostOfRevenue
Stock-based compensation expense
Stock-based compensation expense before income taxes	(27.9)	9.4	24.4
Location, Statement of Income, Balance [Axis]: us-gaap:GeneralAndAdministrativeExpense
Stock-based compensation expense
Stock-based compensation expense before income taxes	149.0	123.2	111.5
Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost
Stock-based compensation expense
Stock-based compensation expense before income taxes	88.9	99.0	104.4
Location, Statement of Income, Balance [Axis]: us-gaap:SellingAndMarketingExpense
Stock-based compensation expense
Stock-based compensation expense before income taxes	$ 95.3	$ 92.4	$ 95.3

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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