Contingencies - Additional Information (Detail) (USD $)	6 Months Ended		12 Months Ended	6 Months Ended	1 Months Ended			6 Months Ended		6 Months Ended			6 Months Ended					6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013	Dec. 29, 2013	Jun. 29, 2014 Power Integrations LegalMatter	Jan. 31, 2011 POWI 1	Dec. 31, 2008 POWI 1	Oct. 31, 2006 POWI 1	Jun. 29, 2014 POWI 1 Phase Product Claim Patent	Oct. 20, 2004 POWI 1 Patent	Jun. 29, 2014 POWI 2 Claim Patent	Apr. 27, 2012 POWI 2 Power Integrations Patent	Apr. 27, 2012 POWI 2 System General Patent	Jun. 29, 2014 POWI 3 Subsidiary Patent	Jun. 29, 2014 POWI 4 Subsidiary Vendor	May 01, 2012 Powi5 Patent	May 01, 2012 Powi5 Power Integrations Patent	Jun. 29, 2014 All Except POWI 3	Jun. 29, 2014 Minimum POWI 1	Jun. 29, 2014 Maximum POWI 1
Loss Contingencies [Line Items]
Number of outstanding proceedings with power integrations				5
Number of patents in lawsuit								4	4	3	4	2	3		3	5
Number of phases in trial								3
Number of products in violation								33
Number of claims in lawsuit								7		1
Damages awarded for infringement of the patents			$ 30,000,000		$ 12,200,000	$ 6,100,000	$ 34,000,000						$ 105,000,000					$ 500,000	$ 750,000
Release of litigation charge	4,400,000	(12,600,000)						12,600,000
Number of patents infringed											2	1	2
Number of company entities included in complaint													2	4
Possible losses, minimum													4,400,000				1,400,000
Possible losses, maximum													21,800,000				14,100,000
Loss contingency accrual													4,400,000
Number of vendors included in lawsuit														7
Assessed damages for infringement of Fairchild patents														17,000,000
Product sales value			$ 20,000