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SIGNIFICANT CUSTOMERS AND EXPORT SALES (Product Sales) (Details) (Product Concentration Risk [Member], Sales Revenue, Goods, Net [Member])
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Communications [Member]
   
Revenue from External Customer [Line Items]    
Concentration risk, percentage of total net revenues 21.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= powi_CommunicationsMember
18.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= powi_CommunicationsMember
Computer [Member]
   
Revenue from External Customer [Line Items]    
Concentration risk, percentage of total net revenues 8.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= powi_ComputerMember
10.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= powi_ComputerMember
Consumer [Member]
   
Revenue from External Customer [Line Items]    
Concentration risk, percentage of total net revenues 38.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= powi_ConsumerMember
37.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= powi_ConsumerMember
Industrial [Member]
   
Revenue from External Customer [Line Items]    
Concentration risk, percentage of total net revenues 33.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= powi_IndustrialMember
35.00%powi_ConcentrationRiskPercentageOfNetRevenue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= powi_IndustrialMember