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Commitments and contingencies (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended		6 Months Ended
	Jun. 27, 2014 Turkish Foreign Tax Authority [Member]	Dec. 28, 2012 Turkish Foreign Tax Authority [Member]	Jun. 27, 2014 Halo [Member]	Jun. 28, 2013 Halo [Member]	Jun. 27, 2014 Halo [Member] Plant	Jun. 28, 2013 Halo [Member]
Commitments [Line Items]
Amount of bond held in an interest-bearing account					$ 1.6
Lawsuit filing date					March 2007
Domicile of Litigation					United States District Court, District of Nevada
Plaintiff allegations					The plaintiff, Halo, claims that we infringe certain U.S. patents related to an electronic surface mount package, and is seeking injunctive relief and damages.
Number of patents infringed					3
Damage and interest payable amount					2.0
Legal expenses			0.1	0.3	0.4	0.6
Legal Reserve
Legal reserve		3.7
(Decrease) increase in Legal reserve	$ (0.1)	$ 3.7