PROVISION FOR INCOME TAXES (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Tax Rate [Line Items]
Effective Income Tax Rate, Continuing Operations	32.40%		24.20%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%	35.00%	35.00%	35.00%
Power Integrations [Member]
Tax Rate [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate		19.40%		19.50%