REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregated Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenue from External Customer [Line Items]
Total net revenue	$ 1,773.8	$ 1,353.1	$ 3,277.6	$ 2,691.3
Recurrent consumer spending
Revenue from External Customer [Line Items]
Total net revenue	1,275.9	1,079.0	2,532.0	2,176.7
Full game and other
Revenue from External Customer [Line Items]
Total net revenue	497.9	274.1	745.6	514.6
Mobile
Revenue from External Customer [Line Items]
Total net revenue	821.6	740.2	1,623.3	1,462.7
Console
Revenue from External Customer [Line Items]
Total net revenue	720.0	491.1	1,270.6	1,000.0
PC and other
Revenue from External Customer [Line Items]
Total net revenue	232.2	121.8	383.7	228.6
Digital online
Revenue from External Customer [Line Items]
Total net revenue	1,693.1	1,300.0	3,169.7	2,595.5
Physical retail and other
Revenue from External Customer [Line Items]
Total net revenue	80.7	53.1	107.9	95.8
Over time
Revenue from External Customer [Line Items]
Total net revenue	1,263.3	1,086.3	2,526.2	2,213.9
Point in time
Revenue from External Customer [Line Items]
Total net revenue	$ 510.5	$ 266.8	$ 751.4	$ 477.4