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Commitments and Contingencies - Narrative (Details) $ in Thousands				1 Months Ended											9 Months Ended	12 Months Ended
	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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