REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of Disaggregated Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total net revenue	$ 6,656.4	$ 5,633.6	$ 5,349.6
Recurrent consumer spending
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total net revenue	5,196.6	4,474.6	4,213.5
Full game and other
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total net revenue	1,459.8	1,159.0	1,136.1
Mobile
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total net revenue	3,333.0	2,942.0	2,748.0
Console
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total net revenue	2,597.3	2,099.1	2,167.3
PC and other
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total net revenue	726.1	592.5	434.3
Digital online
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total net revenue	6,459.7	5,431.8	5,112.2
Physical retail and other
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total net revenue	196.7	201.8	237.4
Over time
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total net revenue	5,291.9	4,504.8	4,312.2
Point in time
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total net revenue	$ 1,364.5	$ 1,128.8	$ 1,037.4