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Property, plant and equipment (Tables)
 12 Months Ended
Dec. 26, 2014
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
Property, plant and equipment consisted of the following (in thousands):
 
December 26, 2014
 
December 27, 2013
Land
$
1,274

 
$
745

Buildings and improvements
10,314

 
8,374

Machinery and equipment
76,496

 
77,522

Software
8,874

 
8,069

Construction in progress
3,100

 
1,900

Property, plant and equipment, gross
100,058

 
96,610

Accumulated depreciation
(73,586
)
 
(68,655
)
 
$
26,472

 
$
27,955