GOODWILL AND INTANGIBLE ASSETS, NET - Intangible Assets Subject to Amortization (Details) - USD ($) $ in Millions	Dec. 31, 2024	Mar. 31, 2024
Capitalized software development costs and licenses
Gross Carrying Amount	$ 4,734.3	$ 4,666.9
Accumulated Amortization	(2,084.1)	(1,606.3)
Net Book Value	2,650.2	3,060.6
Developed Game Technology
Capitalized software development costs and licenses
Gross Carrying Amount	3,853.9	3,788.8
Accumulated Amortization	(1,733.1)	(1,301.4)
Net Book Value	$ 2,120.8	2,487.4
Weighted average useful life	6 years
Branding and Trade Names
Capitalized software development costs and licenses
Gross Carrying Amount	$ 396.8	395.1
Accumulated Amortization	(93.6)	(68.5)
Net Book Value	$ 303.2	326.6
Weighted average useful life	12 years
Game Engine Technology
Capitalized software development costs and licenses
Gross Carrying Amount	$ 329.8	322.5
Accumulated Amortization	(203.0)	(147.3)
Net Book Value	$ 126.8	175.2
Weighted average useful life	4 years
Intellectual property
Capitalized software development costs and licenses
Gross Carrying Amount	$ 94.8	27.5
Accumulated Amortization	(15.6)	(23.1)
Net Book Value	$ 79.2	4.4
Weighted average useful life	14 years
Developer Relationships
Capitalized software development costs and licenses
Gross Carrying Amount	$ 57.0	57.0
Accumulated Amortization	(37.2)	(26.5)
Net Book Value	$ 19.8	30.5
Weighted average useful life	5 years
In Place Lease
Capitalized software development costs and licenses
Gross Carrying Amount	$ 2.0	2.0
Accumulated Amortization	(1.6)	(1.4)
Net Book Value	$ 0.4	$ 0.6
Weighted average useful life	4 years