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Changes in shareholders' equity - Accumulated other comprehensive income into income expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 26, 2016
Jun. 28, 2015
Jun. 26, 2016
Jun. 28, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cost of goods sold $ (217,154) $ (218,808) $ (416,900) $ (425,601)
Total reclassifications, net of tax 2,191 1,403 4,777 2,300
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total before tax 1,501 472 3,372 263
Tax (benefit) expense (363) (110) (704) (100)
Total reclassifications, net of tax 1,138 362 2,668 163
Pension and Other Postretirement Benefits Plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total before tax 1,634 1,605 3,270 3,211
Tax (benefit) expense (581) (564) (1,161) (1,074)
Total reclassifications, net of tax 1,053 1,041 2,109 2,137
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total before tax 1,620 1,605 3,242 3,211
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total before tax 14 0 28 0
Foreign Currency Contract | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cost of goods sold $ 1,501 $ 472 $ 3,372 $ 263