XML 43 R32.htm IDEA: XBRL DOCUMENT
v3.7.0.1

SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNITNG PRONOUNCEMENTS Balance Sheet Adjustments, Adoption of ASU 2016-09 (Details) - Accounting Standards Update 2016-09 $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 USD ($)
Retained Earnings |
Schedule of Retained Earnings and Deferred Tax Asset Adjustments [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 7.5
Deferred Tax Asset |
Schedule of Retained Earnings and Deferred Tax Asset Adjustments [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 7.5

X
- Definition [Line Items] for Schedule of Retained Earnings and Deferred Tax Asset Adjustments [Table] + References No definition available. + Details
Name: | powi_ScheduleofRetainedEarningsandDeferredTaxAssetAdjustmentsLineItems
Namespace Prefix: | powi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the quantification of the effect of adopting the new accounting standard or change in accounting principle expected by the entity to have a significant effect on the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=powi_AccountingStandardsUpdate201609Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_RetainedEarningsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=powi_DeferredTaxAssetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |