GOODWILL AND INTANGIBLE ASSETS, NET - Intangible Assets Subject to Amortization (Details) - USD ($) $ in Millions	Sep. 30, 2024	Mar. 31, 2024
Capitalized software development costs and licenses
Gross Carrying Amount	$ 5,193.7	$ 5,016.2
Accumulated Amortization	(2,333.2)	(1,955.6)
Net Book Value	2,860.5	3,060.6
Developed Game Technology
Capitalized software development costs and licenses
Gross Carrying Amount	3,867.9	3,788.8
Accumulated Amortization	(1,601.2)	(1,301.4)
Net Book Value	$ 2,266.7	2,487.4
Weighted average useful life	6 years
Branding and Trade Names
Capitalized software development costs and licenses
Gross Carrying Amount	$ 403.3	395.1
Accumulated Amortization	(86.7)	(68.5)
Net Book Value	$ 316.6	326.6
Weighted average useful life	12 years
Game Engine Technology
Capitalized software development costs and licenses
Gross Carrying Amount	$ 332.8	322.5
Accumulated Amortization	(185.9)	(147.3)
Net Book Value	$ 146.9	175.2
Weighted average useful life	4 years
Intellectual property
Capitalized software development costs and licenses
Gross Carrying Amount	$ 106.5	27.5
Accumulated Amortization	(25.5)	(23.1)
Net Book Value	$ 81.0	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	(33.6)	(26.5)
Net Book Value	$ 23.4	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	(33.8)	(26.6)
Net Book Value	$ 9.2	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	(14.6)	(11.5)
Net Book Value	$ 16.4	19.5
Weighted average useful life	5 years
In Place Lease
Capitalized software development costs and licenses
Gross Carrying Amount	$ 2.0	2.0
Accumulated Amortization	(1.7)	(1.4)
Net Book Value	$ 0.3	$ 0.6
Weighted average useful life	4 years