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Segment Information
 3 Months Ended
Mar. 29, 2015
Segment Reporting [Abstract]  
Segment Information
SEGMENT INFORMATION
Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker, or decision making group, in deciding how to allocate resources and in assessing performance. Our chief operating decision maker is our Chief Executive Officer.
We currently report our segments based on a group structure organization. Our segments are Industry Group and Science Group.
The following tables summarize various financial amounts for each of our business segments (in thousands):
 
Thirteen Weeks Ended
 
March 29,
2015
 
March 30,
2014
Sales to External Customers:
 
 
 
Industry Group
$
111,900

 
$
106,437

Science Group
108,916

 
119,827

Total
$
220,816

 
$
226,264

Gross Profit:
 
 
 
Industry Group
$
56,610

 
$
56,132

Science Group
48,661

 
50,192

Total
$
105,271

 
$
106,324


 
March 29,
2015
 
December 31,
2014
Goodwill:
 
 
 
Industry Group
$
78,867

 
$
76,858

Science Group
88,056

 
93,915

Total
$
166,923

 
$
170,773

Total Assets:
 
 
 
Industry Group
$
458,780

 
$
444,168

Science Group
416,403

 
470,899

Corporate and Eliminations
484,657

 
502,751

Total
$
1,359,840

 
$
1,417,818


Market segment disclosures are presented to the gross profit level as this is the primary performance measure for which the segment general managers are responsible. Selling, general and administrative, research and development and other operating expenses are managed and reported at the corporate level and, because allocation to the market segments would be arbitrary, have not been allocated to the market segments. See the consolidated statements of operations for reconciliations from gross profit to income before income taxes. These reconciling items are not included in the measure of profit and loss for each reportable segment.
In the thirteen week periods ended March 29, 2015 and March 30, 2014, our top 10 customers accounted for approximately 35% and 30% of our total annual net revenue, respectively. No single customer accounted for more than 10% of net revenues during the thirteen week periods ended March 29, 2015 and March 30, 2014.