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Segment Information (Tables)
 6 Months Ended
Jul. 01, 2017
Segment Information [Abstract]  
Schedule of Segment Reporting Information, by Segment
The following tables set forth business segment information:

  
MOSFETs
  
Diodes
  
Optoelectronic Components
  
Resistors & Inductors
  
Capacitors
  
Total
 
Fiscal quarter ended July 1, 2017:
                  
Product Sales
 
$
114,035
  
$
155,717
  
$
73,838
  
$
209,146
  
$
92,120
  
$
644,856
 
Royalty Revenues
  
-
   
-
   
-
   
36
   
-
  
$
36
 
Total Revenue
 
$
114,035
  
$
155,717
  
$
73,838
  
$
209,182
  
$
92,120
  
$
644,892
 
                         
Gross Profit
 
$
25,315
  
$
41,130
  
$
25,466
  
$
62,090
  
$
18,962
  
$
172,963
 
                         
Segment Operating Income
 
$
16,637
  
$
36,176
  
$
21,474
  
$
54,688
  
$
14,128
  
$
143,103
 
                         
Fiscal quarter ended July 2, 2016:
                        
Product Sales
 
$
102,219
  
$
142,118
  
$
68,059
  
$
192,717
  
$
84,856
  
$
589,969
 
Royalty Revenues
  
-
   
-
   
-
   
82
   
-
  
$
82
 
Total Revenue
 
$
102,219
  
$
142,118
  
$
68,059
  
$
192,799
  
$
84,856
  
$
590,051
 
                         
Gross Profit
 
$
11,884
  
$
37,258
  
$
21,618
  
$
57,256
  
$
18,112
  
$
146,128
 
                         
Segment Operating Income
 
$
2,560
  
$
31,550
  
$
15,844
  
$
48,571
  
$
12,632
  
$
111,157
 
 
Six fiscal months ended July 1, 2017:
                  
Product Sales
 
$
219,564
  
$
300,612
  
$
139,520
  
$
409,523
  
$
181,889
  
$
1,251,108
 
Royalty Revenues
  
-
   
-
   
-
   
42
   
-
  
$
42
 
Total Revenue
 
$
219,564
  
$
300,612
  
$
139,520
  
$
409,565
  
$
181,889
  
$
1,251,150
 
                         
Gross Profit
 
$
45,991
  
$
78,659
  
$
47,767
  
$
123,260
  
$
38,161
  
$
333,838
 
                         
Segment Operating Income
 
$
28,398
  
$
68,915
  
$
38,389
  
$
108,585
  
$
28,300
  
$
272,587
 
                         
Six fiscal months ended July 2, 2016:
                     
Product Sales
 
$
203,152
  
$
277,502
  
$
130,834
  
$
376,133
  
$
172,876
  
$
1,160,497
 
Royalty Revenues
  
-
   
-
   
-
   
160
   
-
  
$
160
 
Total Revenue
 
$
203,152
  
$
277,502
  
$
130,834
  
$
376,293
  
$
172,876
  
$
1,160,657
 
                         
Gross Profit
 
$
24,471
  
$
69,920
  
$
40,799
  
$
113,040
  
$
35,207
  
$
283,437
 
                         
Segment Operating Income
 
$
5,178
  
$
58,193
  
$
29,498
  
$
95,454
  
$
23,935
  
$
212,258
 
Reconciliation of Operating Profit (Loss) from Segments to Consolidated

  
Fiscal quarters ended
  
Six fiscal months ended
 
  
July 1, 2017
  
July 2, 2016
  
July 1, 2017
  
July 2, 2016
 
Reconciliation:
            
Segment Operating Income
 
$
143,103
  
$
111,157
  
$
272,587
  
$
212,258
 
Restructuring and Severance Costs
  
(481
)
  
(4,467
)
  
(1,950
)
  
(10,942
)
Unallocated Selling, General, and Administrative Expenses
  
(60,586
)
  
(57,282
)
  
(123,913
)
  
(111,360
)
Consolidated Operating Income
 
$
82,036
  
$
49,408
  
$
146,724
  
$
89,956
 
Unallocated Other Income (Expense)
  
(6,327
)
  
(3,028
)
  
(20,573
)
  
(5,104
)
Consolidated Income (Loss) Before Taxes
 
$
75,709
  
$
46,380
  
$
126,151
  
$
84,852