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Segment Information (Policies)
9 Months Ended
Sep. 29, 2012
Segment Information [Abstract]  
Segment Reporting Measurement
The Company evaluates business segment performance on operating income, exclusive of certain items (“segment operating income”).  Only dedicated, direct selling, general, and administrative expenses of the segments are included in the calculation of segment operating income.  The Company’s calculation of segment operating income excludes such selling, general, and administrative costs as global operations, sales and marketing, information systems, finance and administration groups, as well as restructuring and severance costs, asset write-downs, goodwill and indefinite-lived intangible asset impairments, inventory write-downs, gains or losses on purchase commitments, and other items.  Management believes that evaluating segment performance excluding such items is meaningful because it provides insight with respect to intrinsic operating results of the Company.  These items represent reconciling items between segment operating income and consolidated operating income.  Business segment assets are the owned or allocated assets used by each business.

Segment Reporting General Information
Vishay operates, and its chief operating decision maker makes strategic and operating decisions with regards to assessing performance and allocating resources based on, five reporting segments: MOSFETs, Diodes, Optoelectronic Components, Resistors & Inductors, and Capacitors.