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Income taxes - Income tax expense (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 26, 2014
Dec. 27, 2013
Current:    
Federal $ 554us-gaap_CurrentFederalTaxExpenseBenefit $ 462us-gaap_CurrentFederalTaxExpenseBenefit
State and local 65us-gaap_CurrentStateAndLocalTaxExpenseBenefit 55us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Non-U.S. 4,986us-gaap_CurrentForeignTaxExpenseBenefit 2,952us-gaap_CurrentForeignTaxExpenseBenefit
Total current income tax expense 5,605us-gaap_CurrentIncomeTaxExpenseBenefit 3,469us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Federal (101)us-gaap_DeferredFederalIncomeTaxExpenseBenefit 140us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State and local 0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (55)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Non-U.S. (752)us-gaap_DeferredForeignIncomeTaxExpenseBenefit 829us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total deferred income tax expense (853)us-gaap_DeferredIncomeTaxExpenseBenefit 914us-gaap_DeferredIncomeTaxExpenseBenefit
Net tax expense $ 4,752us-gaap_IncomeTaxExpenseBenefit $ 4,383us-gaap_IncomeTaxExpenseBenefit