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SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN - Additional Information (Details) | Sep. 30, 2018 participant
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Supplemental Executive Retirement Plan [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Number of participants | 7

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- Definition The number of participants in the defined benefit plan. + References No definition available. + Details
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Namespace Prefix: | oled_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

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- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |