XML 57 R45.htm IDEA: XBRL DOCUMENT
v3.21.1

STOCKHOLDERS' EQUITY Common Stock Repurchases (Details) - USD ($) $ in Millions | Apr. 27, 2021 | Mar. 31, 2021
--- | --- | ---
Stockholders' Equity [Line Items] |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | $ 41.3
Subsequent Event |  |
Stockholders' Equity [Line Items] |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 50.0 |

X
- 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: | powi_StockholdersEquityLineItems
Namespace Prefix: | powi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |