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Other Employee Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Mar. 31, 2024
Retirement Benefits [Abstract]
401(k) contribution matching expense	$ 2.2	$ 2.2	$ 8.2	$ 8.9
Deferred compensation plan obligations	18.0		18.0		$ 16.2
TOLI policies held by the Rabbi Trust	$ 9.0		$ 9.0		$ 9.1

X

- Definition

The Deferred Compensation Plan obligations represent the underlying liabilities to participants in this Plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	ua_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The fair value of the TOLI held by a Rabbi Trust is based on the cash-surrender value of the life insurance policies, which are invested primarily in mutual funds and a separately managed fixed income fund.

+ References

No definition available.

+ Details

Name:	ua_TrustOwnedLifeInsurancePoliciesFairValueDisclosure
Namespace Prefix:	ua_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480794/715-70-50-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration