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ACQUISITIONS (Purchase Price and Estimated Fair Values) (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended 12 Months Ended
May 01, 2012
Dec. 31, 2014
Dec. 31, 2013
Assets Acquired      
Goodwill   80,599us-gaap_Goodwill $ 80,599us-gaap_Goodwill
Concept [Member]      
Assets Acquired      
Cash 14,933us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= powi_ConceptMember
   
Accounts receivable 3,220us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= powi_ConceptMember
   
Inventories 10,631us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= powi_ConceptMember
   
Prepaid expenses and other current assets 2,777us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= powi_ConceptMember
   
Property and equipment, net 2,310us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= powi_ConceptMember
   
Intangible assets 44,050us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= powi_ConceptMember
   
Goodwill 65,813us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= powi_ConceptMember
   
Total assets acquired 143,734us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= powi_ConceptMember
   
Liabilities assumed      
Current liabilities 4,587us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= powi_ConceptMember
   
Deferred tax liabilities 7,860us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= powi_ConceptMember
   
Other liabilities 634us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= powi_ConceptMember
   
Total liabilities assumed 13,081us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= powi_ConceptMember
   
Total purchase price 130,653us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= powi_ConceptMember
   
Developed technology [Member] | Concept [Member]      
Assets Acquired      
Intangible assets 23,750us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= powi_ConceptMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
   
Trade names [Member] | Concept [Member]      
Assets Acquired      
Intangible assets 3,600us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= powi_ConceptMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
   
Customer relationships [Member] | Concept [Member]      
Assets Acquired      
Intangible assets $ 16,700us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= powi_ConceptMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
   
Liabilities assumed      
Useful life (in years) 10 years    
Minimum [Member] | Developed technology [Member] | Concept [Member]      
Liabilities assumed      
Useful life (in years) 4 years    
Minimum [Member] | Trade names [Member]      
Liabilities assumed      
Useful life (in years)   2 years  
Maximum [Member] | Developed technology [Member] | Concept [Member]      
Liabilities assumed      
Useful life (in years) 12 years    
Maximum [Member] | Patents [Member]      
Liabilities assumed      
Useful life (in years)   12 years