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Other Employee Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Retirement Benefits [Abstract]
401(k) contribution matching expense	$ 6.1	$ 2.3
Deferred compensation plan obligations	14.2	14.6	$ 14.5
TOLI policies held by the Rabbi Trust (see Note 13)	$ 8.4	$ 8.0	$ 9.0

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
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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

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

X

- References

No definition available.

+ Details

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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Balance Type:	debit
Period Type:	duration