Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Class A Common Stock	Class B Convertible Common Stock	Class C Common Stock	Common Stock Class A Common Stock	Common Stock Class B Convertible Common Stock	Common Stock Class C Common Stock	Additional Paid-in-Capital	Additional Paid-in-Capital Class C Common Stock	Retained Earnings	Retained Earnings Class C Common Stock	Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Mar. 31, 2024					188,802,000	34,450,000	212,711,000
Beginning balance at Mar. 31, 2024	$ 2,153,286				$ 63	$ 11	$ 70	$ 1,181,854		$ 1,048,411		$ (77,123)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements (in shares)							(1,194,000)
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements	(7,944)									(7,944)
Excise tax on repurchases of common stock	(200)							(200)
Class C Common Stock repurchased (in shares)							(5,940,000)
Class C Common Stock repurchased				$ (40,000)			$ (2)		$ 943		$ (40,941)
Issuance of common stock, net of forfeitures (in shares)							3,217,000
Issuance of Class C Common Stock, net of forfeitures				$ 643			$ 1		642
Stock-based compensation expense	15,924							15,924
Comprehensive income (loss)	(305,137)									(305,426)		289
Ending balance (in shares) at Jun. 30, 2024					188,802,000	34,450,000	208,794,000
Ending balance at Jun. 30, 2024	1,816,572				$ 63	$ 11	$ 69	1,199,163		694,100		(76,834)
Beginning balance (in shares) at Mar. 31, 2025		188,822,726	34,450,000	202,720,745	188,823,000	34,450,000	202,721,000
Beginning balance at Mar. 31, 2025	1,890,278				$ 63	$ 11	$ 67	1,237,798		746,277		(93,938)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements (in shares)							(1,234,000)
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements	(7,485)									(7,485)
Issuance of common stock, net of forfeitures (in shares)							3,930,000
Issuance of Class C Common Stock, net of forfeitures				$ 552			$ 1		$ 551
Stock-based compensation expense	12,219							12,219
Comprehensive income (loss)	(21,135)									(2,612)		(18,523)
Ending balance (in shares) at Jun. 30, 2025		188,822,726	34,450,000	205,416,539	188,823,000	34,450,000	205,417,000
Ending balance at Jun. 30, 2025	$ 1,874,429				$ 63	$ 11	$ 68	$ 1,250,568		$ 736,180		$ (112,461)

Under Armour, Inc. 10-Q