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Summary of Quarterly Financial Data (unaudited) (Tables)
12 Months Ended
Jan. 03, 2015
Summary of Quarterly Financial Data (unaudited) [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]
The following is a condensed summary of our quarterly results (in thousands, except net income per share amounts). Quarterly diluted net income per share amounts may not total to the respective annual amount due to changes in weighted-average shares outstanding during the year. 
2014
 
First
 
Second
 
Third
 
Fourth
 
Fiscal
Year
Net sales
 
$
276,412

 
$
234,763

 
$
323,366

 
$
322,216

 
$
1,156,757

Gross profit
 
171,383

 
142,397

 
198,584

 
194,486

 
706,850

Operating income
 
25,802

 
12,711

 
35,346

 
27,887

 
101,746

Net income
 
16,992

 
8,481

 
23,554

 
18,947

 
67,974

Net income per share – diluted
 
0.31

 
0.16

 
0.44

 
0.35

 
1.25

 
2013
 
First
 
Second
 
Third
 
Fourth
 
Fiscal
Year
Net sales
 
$
258,237

 
$
207,391

 
$
263,689

 
$
230,854

 
$
960,171

Gross profit
 
163,416

 
131,398

 
166,420

 
140,521

 
601,755

Operating income
 
35,227

 
15,107

 
30,699

 
9,655

 
90,688

Net income
 
23,471

 
9,926

 
20,259

 
6,425

 
60,081

Net income per share – diluted
 
0.42

 
0.18

 
0.36

 
0.12

 
1.08