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Revenues - Customer Refund Liability (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Mar. 31, 2022
Customer refund liability |  |
Disaggregation of Revenue [Line Items] |  |
Reserves for customer returns allowances markdowns and discounts | $ 155,021 | $ 159,628
Inventory associated with the reserves |  |
Disaggregation of Revenue [Line Items] |  |
Reserves for customer returns allowances markdowns and discounts | $ 39,968 | $ 44,291

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- 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

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- 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

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

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