GOODWILL AND INTANGIBLE ASSETS, NET - Intangible Assets Subject to Amortization (Details) - USD ($) $ in Millions	Jun. 30, 2024	Mar. 31, 2024
Capitalized software development costs and licenses
Gross Carrying Amount	$ 5,142.0	$ 5,016.2
Accumulated Amortization	(2,136.1)	(1,955.6)
Net Book Value	3,005.9	3,060.6
Developed Game Technology
Capitalized software development costs and licenses
Gross Carrying Amount	3,792.8	3,788.8
Accumulated Amortization	(1,444.2)	(1,301.4)
Net Book Value	$ 2,348.6	2,487.4
Weighted average useful life	7 years
Branding and Trade Names
Capitalized software development costs and licenses
Gross Carrying Amount	$ 399.1	395.1
Accumulated Amortization	(77.3)	(68.5)
Net Book Value	$ 321.8	326.6
Weighted average useful life	12 years
Game Engine Technology
Capitalized software development costs and licenses
Gross Carrying Amount	$ 321.8	322.5
Accumulated Amortization	(165.4)	(147.3)
Net Book Value	$ 156.4	175.2
Weighted average useful life	4 years
User Base
Capitalized software development costs and licenses
Gross Carrying Amount	$ 319.2	319.2
Accumulated Amortization	(319.2)	(319.2)
Net Book Value	$ 0.0	0.0
Weighted average useful life	0 years
Intellectual Property
Capitalized software development costs and licenses
Gross Carrying Amount	$ 146.4	27.5
Accumulated Amortization	(25.5)	(23.1)
Net Book Value	$ 120.9	4.4
Weighted average useful life	5 years
Developer Relationships
Capitalized software development costs and licenses
Gross Carrying Amount	$ 57.0	57.0
Accumulated Amortization	(30.0)	(26.5)
Net Book Value	$ 27.0	30.5
Weighted average useful life	5 years
Advertising Technology
Capitalized software development costs and licenses
Gross Carrying Amount	$ 43.0	43.0
Accumulated Amortization	(30.2)	(26.6)
Net Book Value	$ 12.8	16.4
Weighted average useful life	3 years
Customer relationships
Capitalized software development costs and licenses
Gross Carrying Amount	$ 31.0	31.0
Accumulated Amortization	(13.1)	(11.5)
Net Book Value	$ 17.9	19.5
Weighted average useful life	5 years
Analytics Technology
Capitalized software development costs and licenses
Gross Carrying Amount	$ 29.7	30.1
Accumulated Amortization	(29.7)	(30.1)
Net Book Value	$ 0.0	0.0
Weighted average useful life	0 years
In Place Lease
Capitalized software development costs and licenses
Gross Carrying Amount	$ 2.0	2.0
Accumulated Amortization	(1.5)	(1.4)
Net Book Value	$ 0.5	$ 0.6
Weighted average useful life	4 years