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Severance, impairment and other associated costs (Tables)
12 Months Ended
Dec. 28, 2012
Severance, impairment and other associated costs [Abstract]  
Summary of severance and other costs
The change in accrued expenses related to severance and other associated costs (excluding asset impairments) for the year ended December 28, 2012, December 30, 2011 and December 31, 2010 as follows (in thousands):

Balance accrued at December 25, 2009
 $1.4 
      
Net expense
  1.9 
Cash payments
  (2.1)
Non-cash charges
  (0.6)
      
Balance accrued at December 31, 2010
  0.6 
      
Net expense
  13.7 
Cash payments
  (9.6)
Non-cash charges
  (0.5)
      
Balance accrued at December 30, 2011
  4.2 
Net expense
  5.0 
Cash payments
  (8.2)
Non-cash charges
  (0.3)
      
Balance accrued at December 28, 2012
 $0.7