Disposal Group, Including Discontinued Operation, Consideration, Escrow Deposit as Percentage of Purchase Price

No definition available.

Name:	ueic_DisposalGroupIncludingDiscontinuedOperationConsiderationEscrowDepositasPercentageofPurchasePrice
Namespace Prefix:	ueic_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Disposal Group, Including Discontinued Operation, Consideration, Nonrefundable Deposit

+ References

No definition available.

+ Details

Name:	ueic_DisposalGroupIncludingDiscontinuedOperationConsiderationNonrefundableDeposit
Namespace Prefix:	ueic_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Disposal Group, Consideration, Received Upon Government Approvals

+ References

No definition available.

+ Details

Name:	ueic_DisposalGroupIncludingDiscontinuedOperationConsiderationReceivedUponGovernmentApprovals
Namespace Prefix:	ueic_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Disposal Group, Including Discontinued Operation, Escrow Deposit

+ References

No definition available.

+ Details

Name:	ueic_DisposalGroupIncludingDiscontinuedOperationEscrowDeposit
Namespace Prefix:	ueic_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Disposal Group, Not Discontinued Operation, Gain (Loss) On Disposal, Net Of Tax

+ References

No definition available.

+ Details

Name:	ueic_DisposalGroupNotDiscontinuedOperationGainLossOnDisposalNetOfTax
Namespace Prefix:	ueic_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

+ Details

Name:	us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230

+ Details

Name:	us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

+ Details

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

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

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=ueic_GuangzhouFactoryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=us-gaap_EmployeeSeveranceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringPlanAxis=ueic_ManufacturingActivitiesTransitionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Commitments and Contingencies - Restructuring Activities and Sale of Guangzhou Factory (Details) $ in Thousands, ¥ in Millions		3 Months Ended		6 Months Ended
	Jun. 26, 2018 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Apr. 26, 2018 USD ($)	Apr. 26, 2018 CNY (¥)	Apr. 23, 2018 USD ($)	Apr. 23, 2018 CNY (¥)	Sep. 26, 2016 CNY (¥)
Restructuring Cost and Reserve [Line Items]
Factory transition restructuring charges		$ 0	$ 449	$ 0	$ 5,699
Nonrefundable deposit						$ 5,100	¥ 34
Consideration receivable upon government approvals						35,800	237
Escrow deposit						$ 10,300	¥ 68
Gain on sale of Guangzhou factory	$ 37,000	$ 36,978	0	$ 36,978	0
Net gain on disposal	$ 32,100
Guangzhou Factory \| Disposed of by Sale
Restructuring Cost and Reserve [Line Items]
Consideration received in sale								$ 51,400	¥ 339	¥ 320
Escrow deposit as percentage of purchase price										10.00%
Employee Severance \| Manufacturing Activities Transition \| Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Factory transition restructuring charges			$ 400		$ 5,700