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Commitments and Contingencies (Narrative) (Details) |  |  |  |  |  |  | 1 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
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Dec. 27, 2016 patent | Nov. 01, 2016 patent | Sep. 19, 2016 facility | Aug. 11, 2016 patent | Nov. 27, 2013 USD ($) | Oct. 14, 2008 claim | Dec. 31, 2015 USD ($) | Jun. 30, 2015 USD ($) patent | Nov. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) patent | May 31, 2012 patent | Apr. 30, 2012 claim | Jan. 31, 2011 USD ($) | Dec. 31, 2008 USD ($) | Oct. 31, 2006 claim product | Aug. 31, 2016 patent | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) claim | Dec. 31, 2015 USD ($) patent | Dec. 31, 2014 USD ($) | Dec. 31, 2009 patent | Dec. 31, 2008 claim | Dec. 31, 2004 USD ($) patent
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total rent expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 31,100,000 | $ 27,700,000 | $ 22,700,000 |  |  |
Availability under senior revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 |  |  |  |  |
Outstanding guarantees and letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,700,000 |  |  |  |  |
Guarantees related to capital lease obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 130,700,000 |  |  |  |  |
Long-term debt |  |  |  |  |  |  | $ 1,515,800,000 |  |  |  |  |  |  |  |  |  |  | 3,806,800,000 | 1,515,800,000 |  |  |  |
Net carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,806,800,000 |  |  |  |  |
Senior Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |
Notes Payable to Banks [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  | 198,200,000 |  |  |  |  |  |  |  |  |  |  | 160,400,000 | $ 198,200,000 |  |  |  |
Letter of Credit [Member] | Senior Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit commitment outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Fairchild [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities acquired | facility |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum remediation cost recoveries receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000 |  |  |  |  |
ON Semi, SCI, and Fairchild [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of patents allegedly infringed upon | patent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |
Power Integrations, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of outstanding proceedings | claim |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |
Power Integrations, Inc. [Member] | Fairchild [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of outstanding proceedings | claim |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |
Power Integrations, Inc., USPTO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of outstanding proceedings | claim |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 |  |  |  |  |
Power Integrations, Delaware, 2004 [Member] | Fairchild [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of outstanding proceedings | claim |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |  |  |  |  |  |  |
Loss contingency, number of patents allegedly infringed upon |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 4
Loss contingency, number of products that infringed upon patents | product |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33 |  |  |  |  |  |  |  |
Litigation settlement, amount awarded to (against) entity |  |  |  |  |  |  |  |  |  |  |  |  | $ (12,200,000) | $ (6,100,000) |  |  |  |  |  |  |  |  | $ (34,000,000)
Power Integrations, Delaware, 2008 [Member] | Fairchild [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of patents allegedly infringed upon | claim |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  | 3 |
Gain contingency, number of patents allegedly infringed upon | claim |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Power Integrations, Northern District of California, 2009 [Member] | Fairchild [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of patents allegedly infringed upon | patent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
Litigation settlement, amount awarded to (against) entity |  |  |  |  |  |  | (139,800,000) |  |  | $ (105,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Gain contingency, number of patents allegedly infringed upon | patent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
Loss contingency, number of patents infringed upon | patent |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain contingency, number of patents not infringed upon | patent |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, amount vacated |  |  |  |  |  |  |  |  | $ 105,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement interest |  |  |  |  |  |  | $ 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Power Integrations, Delaware, 2012 [Member] | Fairchild [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of patents allegedly infringed upon | patent |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, amount awarded to (against) entity |  |  |  |  |  |  |  | $ 2,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain contingency, number of patents allegedly infringed upon | patent |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |
Power Integrations, Delaware, 2012 [Member] | Fairchild [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, amount awarded to (against) entity |  |  |  |  |  |  |  | $ (100,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of patents infringed upon | patent |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of patents found not infringed | patent |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |
Power Integrations, Northern District of California, 2015 [Member] | Fairchild [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of patents allegedly infringed upon | patent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Gain contingency, number of patents allegedly infringed upon | patent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |
Power Integrations, Arizona, 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain contingency, number of patents allegedly infringed upon | patent |  | 2 |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of patents requiring declaratory judgment | patent |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Power Integrations, Northern District of California, 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain contingency, number of patents allegedly infringed upon | patent |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Power Integrations, Eastern District of Texas, 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain contingency, number of patents allegedly infringed upon | patent | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acbel Polytech, Inc. [Member] | Fairchild [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, damages sought |  |  |  |  | $ 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fairchild [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, maximum indemnification period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 years |  |  |  |  |
Minimum [Member] | Power Integrations, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, estimate of possible loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,000,000 |  |  |  |  |
Minimum [Member] | Power Integrations, Delaware, 2004 [Member] | Fairchild [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of sales and imports of affected products |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  |  |  |  |  |
Maximum [Member] | Power Integrations, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, estimate of possible loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,000,000 |  |  |  |  |
Maximum [Member] | Power Integrations, Delaware, 2004 [Member] | Fairchild [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of sales and imports of affected products |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750,000 |  |  |  |  |  |

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