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ACQUISITION (Purchase Price and Estimated Fair Values) (Details) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 3 Months Ended
Jan. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Jan. 02, 2015
Business Acquisition [Line Items]        
Assets Acquired, Goodwill   91,849us-gaap_Goodwill $ 80,599us-gaap_Goodwill  
Cambridge Semiconductor Limited [Member]        
Business Acquisition [Line Items]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents       1,134us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= powi_CambridgeSemiconductorLimitedMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables       1,891us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= powi_CambridgeSemiconductorLimitedMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory       1,409us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= powi_CambridgeSemiconductorLimitedMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets       408us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= powi_CambridgeSemiconductorLimitedMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Receivable       1,093powi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedReceivable
/ us-gaap_BusinessAcquisitionAxis
= powi_CambridgeSemiconductorLimitedMember
Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles       9,020us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= powi_CambridgeSemiconductorLimitedMember
Assets Acquired, Goodwill       11,250us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= powi_CambridgeSemiconductorLimitedMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets       26,205us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= powi_CambridgeSemiconductorLimitedMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities       1,832us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= powi_CambridgeSemiconductorLimitedMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Taxes Payable       1,090powi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedTaxesPayable
/ us-gaap_BusinessAcquisitionAxis
= powi_CambridgeSemiconductorLimitedMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities       2,922us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= powi_CambridgeSemiconductorLimitedMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net       23,283us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= powi_CambridgeSemiconductorLimitedMember
Cambridge Semiconductor Limited [Member] | Developed technology [Member]        
Business Acquisition [Line Items]        
Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles       6,600us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= powi_CambridgeSemiconductorLimitedMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Cambridge Semiconductor Limited [Member] | Customer relationships [Member]        
Business Acquisition [Line Items]        
Estimated Useful Life 5 years 5 years    
Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles       $ 2,420us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= powi_CambridgeSemiconductorLimitedMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Minimum [Member]        
Business Acquisition [Line Items]        
Estimated Useful Life   2 years    
Minimum [Member] | Cambridge Semiconductor Limited [Member] | Developed technology [Member]        
Business Acquisition [Line Items]        
Estimated Useful Life 3 years      
Maximum [Member]        
Business Acquisition [Line Items]        
Estimated Useful Life   12 years    
Maximum [Member] | Cambridge Semiconductor Limited [Member] | Developed technology [Member]        
Business Acquisition [Line Items]        
Estimated Useful Life 7 years