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Commitments and contingencies (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 29, 2013
Patent
Mar. 30, 2012
Dec. 28, 2012
Turkish Foreign Tax Authority [Member]
     
Income Tax Examination [Line Items]      
Initial income tax examination judgment     $ 3.7
Increase in income tax liability reserve     3.7
Pending or Threatened Litigation Halo [Member]
     
Commitments [Line Items]      
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    
Increase in legal reserve     1.8
Legal expenses $ 0.3 $ 0.1