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Commitments and Contingencies - Narrative (Details) $ in Thousands |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended
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Mar. 09, 2017 patent | Aug. 11, 2016 patent | Oct. 14, 2008 claim | Nov. 30, 2017 patent | Dec. 31, 2016 claim | Nov. 30, 2016 patent | Dec. 31, 2015 USD ($) | May 31, 2015 USD ($) | Nov. 30, 2014 USD ($) | Mar. 31, 2013 USD ($) | May 31, 2012 patent | Apr. 30, 2012 claim | Jan. 31, 2011 USD ($) | Dec. 31, 2008 USD ($) | Sep. 28, 2018 USD ($) claim review | Dec. 31, 2015 patent | Dec. 31, 2014 USD ($) patent | Dec. 31, 2009 patent | Dec. 31, 2008 claim | Dec. 31, 2006 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding guarantees and letters of credit | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,500 |  |  |  |  |
Guarantees related to capital lease obligations | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 71,300 |  |  |  |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, current borrowing capacity | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000 |  |  |  |  |
Letter of Credit | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit commitment outstanding | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |
Power Integrations, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of outstanding proceedings | claim |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |
Power Integrations, Inc. | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, estimate of possible loss | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,000 |  |  |  |  |
Power Integrations, Inc. | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, estimate of possible loss | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,000 |  |  |  |  |
Power Integrations, Northern District of California, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of patents allegedly infringed upon | patent |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of patents requiring declaratory judgment | patent |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Power Integrations, Arizona, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain contingency, number of patents allegedly infringed upon | patent |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of patents requiring declaratory judgment | patent |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Power Integrations, Delaware, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of patents allegedly infringed upon | patent | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain contingency, number of patents allegedly infringed upon | patent | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Power Integrations, November 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain contingency, number of patents allegedly infringed upon | patent |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Power Integrations, Inc., USPTO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain contingency, number of patents found infringed upon | claim |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |  |  |  |
Patents reviewed and found unpatentable | review |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Inter party review | review |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |
Fairchild |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum remediation cost recoveries receivable | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000 |  |  |  |  |
Fairchild | Power Integrations, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of outstanding proceedings | claim |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |
Fairchild | Power Integrations, Delaware, 2004 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, amount awarded by judge | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,200 | $ 6,100 |  |  |  |  |  | $ 34,000
Loss contingency, number of patents allegedly infringed upon | claim |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Fairchild | Power Integrations, Delaware, 2004 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of sales and imports of affected products | $ |  |  |  |  |  |  |  |  |  | $ 750 |  |  |  |  |  |  |  |  |  |
Fairchild | Power Integrations, Delaware, 2008 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of patents allegedly infringed upon | claim |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |
Gain contingency, number of patents found infringed upon | claim |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Gain contingency, number of patents allegedly infringed upon | claim |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of patents infringed upon | claim |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Loss contingency, number of patents found not infringed upon | claim |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fairchild | Power Integrations, Northern District of California, 2009 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, amount awarded by judge | $ |  |  |  |  |  |  | $ 139,800 |  |  |  |  |  |  |  |  |  | $ 105,000 |  |  |
Loss contingency, number of patents allegedly infringed upon | patent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
Gain contingency, number of patents allegedly infringed upon | patent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
Loss contingency, number of patents infringed upon | patent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
Litigation settlement, amount vacated | $ |  |  |  |  |  |  |  |  | $ 105,000 |  |  |  |  |  |  |  |  |  |  |
Litigation settlement interest | $ |  |  |  |  |  |  | $ 7,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Fairchild | Power Integrations, Delaware, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of patents allegedly infringed upon | patent |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |
Loss contingency, number of patents found not infringed upon | patent |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Litigation settlement, amount awarded from other party | $ |  |  |  |  |  |  |  | $ 2,400 |  |  |  |  |  |  |  |  |  |  |  |
Fairchild | Power Integrations, Delaware, 2012, 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, amount awarded by judge | $ |  |  |  |  |  |  |  | $ 100 |  |  |  |  |  |  |  |  |  |  |  |
Fairchild | Power Integrations, Northern District of California, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of patents allegedly infringed upon | patent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Gain contingency, number of patents allegedly infringed upon | patent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |
Fairchild |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, maximum indemnification period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 years |  |  |  |  |

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