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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS - Equity Method Investment (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024	Nov. 30, 2024
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments	$ (215)	$ 605	$ (26)
Net revenues (Note 10)	4,966,370	5,164,310	5,701,879
License \| Japanese Licensee
Schedule of Equity Method Investments [Line Items]
Net revenues (Note 10)	26,300	26,400	34,800
ISC Sport, (Australian)
Schedule of Equity Method Investments [Line Items]
Investment	7,200	7,300		$ 7,500
Ownership percentage				29.50%
Income (loss) from equity method investments	$ 200	200
Japanese Licensee
Schedule of Equity Method Investments [Line Items]
Ownership percentage	29.50%
Income (loss) from equity method investments	$ 0		(300)
Japanese Licensee \| Licensing Receivable
Schedule of Equity Method Investments [Line Items]
Accounts receivable, net	14,000	13,700
UA Sports (Thailand) Co., Ltd
Schedule of Equity Method Investments [Line Items]
Investment	$ 5,200	5,300
Ownership percentage	49.50%
Income (loss) from equity method investments	$ (400)	$ 400	$ 300