Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 27, 2014	Sep. 01, 2014
Goodwill [Roll Forward]
Balance at beginning of period	$ 43,132
Exchange rate effects	(1,138)
Balance at end of period	147,436
Holy Stone Polytech [Member]
Goodwill [Roll Forward]
Goodwill acquired during period	7,736
Other intangible assets related to acquisitions	3,736
Capella [Member]
Goodwill [Roll Forward]
Balance at beginning of period		97,706
Goodwill acquired during period	97,706
Balance at end of period		97,706
Other intangible assets related to acquisitions	74,481
Resistors And Inductors Segment [Member]
Goodwill [Roll Forward]
Balance at beginning of period	43,132
Exchange rate effects	(643)
Balance at end of period	42,489
Resistors And Inductors Segment [Member] | Holy Stone Polytech [Member]
Goodwill [Roll Forward]
Goodwill acquired during period	0
Resistors And Inductors Segment [Member] | Capella [Member]
Goodwill [Roll Forward]
Goodwill acquired during period	0
Capacitors Segment [Member]
Goodwill [Roll Forward]
Balance at beginning of period	0
Exchange rate effects	(495)
Balance at end of period	7,241
Capacitors Segment [Member] | Holy Stone Polytech [Member]
Goodwill [Roll Forward]
Goodwill acquired during period	7,736
Capacitors Segment [Member] | Capella [Member]
Goodwill [Roll Forward]
Goodwill acquired during period	0
Optoelectronic Components Segment [Member]
Goodwill [Roll Forward]
Balance at beginning of period	0
Exchange rate effects	0
Balance at end of period	97,706
Optoelectronic Components Segment [Member] | Holy Stone Polytech [Member]
Goodwill [Roll Forward]
Goodwill acquired during period	0
Optoelectronic Components Segment [Member] | Capella [Member]
Goodwill [Roll Forward]
Goodwill acquired during period	$ 97,706