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Performance-Based Common Stock Warrants - Impact to Net Sales in Connection with Warrants and Related Income Tax Benefit (Details) - Common stock purchase warrants - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Class of Warrant or Right [Line Items] |  |  |  |
Reduction to net sales | $ 131 | $ 154 | $ 274 | $ 338
Income tax benefit | $ 32 | $ 38 | $ 68 | $ 84

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- Definition Class of Warrant or Right, Contra Revenue + References No definition available. + Details
Name: | ueic_ClassofWarrantorRightContraRevenue
Namespace Prefix: | ueic_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Class of Warrant or Right, Income Tax Expense (Benefit) + References No definition available. + Details
Name: | ueic_ClassofWarrantorRightIncomeTaxExpenseBenefit
Namespace Prefix: | ueic_
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_ClassOfWarrantOrRightLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=ueic_CommonStockPurchaseWarrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |