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Commitments and contingencies (Tables)
 12 Months Ended
Dec. 30, 2011
Commitments and contingencies [Abstract]  
Aggregate rental commitments under non-cancelable lease
The aggregate minimum rental commitments under non-cancelable leases in effect at December 30, 2011 were as follows (in thousands):
 
Year Ending
 
 
 
2012
 
$
4,435
 
2013
 
 
2,087
 
2014
 
 
1,512
 
2015
 
 
1,242
 
2016
 
 
857
 
Thereafter
 
 
1,672
 
 
 
$
11,805