CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings/(Accumulated Deficit)	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Mar. 31, 2023		192.6
Beginning balance (in shares) at Mar. 31, 2023				(23.7)
Beginning balance at Mar. 31, 2023	$ 9,042.5	$ 1.9	$ 9,010.2	$ (1,020.6)	$ 1,164.3	$ (113.3)
Increase (Decrease) in Stockholders' Equity
Net loss	(841.2)				(841.2)
Change in cumulative foreign currency translation adjustment	29.2					29.2
Net unrealized gain on available-for-sale securities, net of taxes	1.4					1.4
Stock-based compensation	315.2		315.2
Issuance of restricted stock, net of forfeitures and cancellations (in shares)		1.7
Net share settlement of restricted stock awards (in shares)		(0.5)
Net share settlement of restricted stock awards	(76.6)		(76.6)
Employee share purchase plan settlement (in shares)		0.4
Employee share purchase plan settlement	37.9		37.9
Exercise of stock options	0.2		0.2
Ending balance (in shares) at Dec. 31, 2023		194.2
Ending balance (in shares) at Dec. 31, 2023				(23.7)
Ending balance at Dec. 31, 2023	8,508.6	$ 1.9	9,286.9	$ (1,020.6)	323.1	(82.7)
Beginning balance (in shares) at Sep. 30, 2023		193.7
Beginning balance (in shares) at Sep. 30, 2023				(23.7)
Beginning balance at Sep. 30, 2023	8,430.1	$ 1.9	9,183.2	$ (1,020.6)	414.7	(149.1)
Increase (Decrease) in Stockholders' Equity
Net loss	(91.6)				(91.6)
Change in cumulative foreign currency translation adjustment	66.3					66.3
Net unrealized gain on available-for-sale securities, net of taxes	0.1					0.1
Stock-based compensation	103.8		103.8
Issuance of restricted stock, net of forfeitures and cancellations (in shares)		0.4
Net share settlement of restricted stock awards (in shares)		(0.1)
Net share settlement of restricted stock awards	(19.5)		(19.5)
Employee share purchase plan settlement (in shares)		0.2
Employee share purchase plan settlement	19.4		19.4
Ending balance (in shares) at Dec. 31, 2023		194.2
Ending balance (in shares) at Dec. 31, 2023				(23.7)
Ending balance at Dec. 31, 2023	$ 8,508.6	$ 1.9	9,286.9	$ (1,020.6)	323.1	(82.7)
Beginning balance (in shares) at Mar. 31, 2024	170.8	194.5
Beginning balance (in shares) at Mar. 31, 2024	(23.7)			(23.7)
Beginning balance at Mar. 31, 2024	$ 5,667.9	$ 1.9	9,371.6	$ (1,020.6)	(2,579.9)	(105.1)
Increase (Decrease) in Stockholders' Equity
Net loss	(752.7)				(752.7)
Change in cumulative foreign currency translation adjustment	(38.1)					(38.1)
Net unrealized gain on available-for-sale securities, net of taxes	0.0
Stock-based compensation	305.0		305.0
Issuance of restricted stock, net of forfeitures and cancellations (in shares)		2.0
Employee share purchase plan settlement (in shares)		0.4
Employee share purchase plan settlement	45.5		45.5
Issuance of shares related to Zynga convertible notes (in shares)		0.1
Issuance of shares related to Zynga convertible notes	16.0		16.0
Issuance of shares related to Gearbox acquisition (in shares)		2.8
Issuance of shares related to Gearbox acquisition	448.6		448.6
Exercise of stock options (in shares)		0.3
Exercise of stock options	9.3		9.3
Other changes, net	$ 0.4	$ 0.1	0.3
Ending balance (in shares) at Dec. 31, 2024	176.4	200.1
Ending balance (in shares) at Dec. 31, 2024	(23.7)			(23.7)
Ending balance at Dec. 31, 2024	$ 5,701.9	$ 2.0	10,196.3	$ (1,020.6)	(3,332.6)	(143.2)
Beginning balance (in shares) at Sep. 30, 2024		199.2
Beginning balance (in shares) at Sep. 30, 2024				(23.7)
Beginning balance at Sep. 30, 2024	5,798.5	$ 2.0	10,063.4	$ (1,020.6)	(3,207.4)	(38.9)
Increase (Decrease) in Stockholders' Equity
Net loss	(125.2)				(125.2)
Change in cumulative foreign currency translation adjustment	(104.3)					(104.3)
Net unrealized gain on available-for-sale securities, net of taxes	0.0
Stock-based compensation	101.5		101.5
Issuance of restricted stock, net of forfeitures and cancellations (in shares)		0.4
Net share settlement of restricted stock awards (in shares)		0.0
Net share settlement of restricted stock awards	0.0
Employee share purchase plan settlement (in shares)		0.2
Employee share purchase plan settlement	22.2		22.2
Issuance of shares related to Zynga convertible notes (in shares)		0.1
Exercise of stock options (in shares)		0.3
Exercise of stock options	8.9		8.9
Other changes, net	$ 0.3		0.3
Ending balance (in shares) at Dec. 31, 2024	176.4	200.1
Ending balance (in shares) at Dec. 31, 2024	(23.7)			(23.7)
Ending balance at Dec. 31, 2024	$ 5,701.9	$ 2.0	$ 10,196.3	$ (1,020.6)	$ (3,332.6)	$ (143.2)