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Revenues - Customer Refund Liability (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Customer refund liability
Disaggregation of Revenue [Line Items]
Reserves for customer returns allowances markdowns and discounts	$ 159,628	$ 191,979	$ 164,294
Inventory associated with the reserves
Disaggregation of Revenue [Line Items]
Reserves for customer returns allowances markdowns and discounts	$ 44,291	$ 54,540	$ 47,569

X

- Definition

Reserves For Customer Returns Allowances Markdowns And Discounts

+ References

No definition available.

+ Details

Name:	ua_ReservesForCustomerReturnsAllowancesMarkdownsAndDiscounts
Namespace Prefix:	ua_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=ua_CustomerRefundLiabilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=ua_InventoryAssociatedWithTheReservesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: