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Segment Information (Tables)
 12 Months Ended
Jan. 28, 2018
Segment Reporting [Abstract]  
Net sales by segment
Net sales by segment are as follows:
 
Fiscal Year Ended
(in thousands)
January 28, 2018
 
January 29, 2017
 
January 31, 2016
Semiconductor Products Group
$
587,847

 
$
544,067

 
$
485,570

All others
—

 
205

 
4,649

Total
$
587,847

  
$
544,272

 
$
490,219
Income by segment and reconciliation to consolidated
Income by segment and reconciliation to consolidated operating income:
 
Fiscal Year Ended
(in thousands)
January 28, 2018
 
January 29, 2017
 
January 31, 2016
Semiconductor Products Group
$
160,810

 
$
126,271

 
$
83,422

All others
—

 
23,406

 
(3,670
)
   Operating income by segment
160,810

 
149,677

 
79,752

Items to reconcile segment operating income to consolidated income before taxes
 
 
 
 
 
Share-based compensation
47,936

 
30,828

 
20,468

Intangible amortization
27,867

 
25,301

 
25,059

Changes in the fair value of contingent earn-out obligations
3,892

 
(215
)
 
(16,362
)
Other non-segment related expenses
12,189

 
7,455

 
19,067

Amortization of fair value adjustments related to acquired property, plant and equipment
190

 
2,227

 
1,521

Interest expense, net
7,963

 
9,300

 
7,819

Non-operating expense, net
902

 
1,721

 
1,801

Income before taxes
$
59,871

 
$
73,060

 
$
20,379
Net sales by product line
The table below provides net sales activity by product line on a comparative basis for all periods.
 
Fiscal Year Ended
(in thousands, except percentages)
January 28, 2018
 
January 29, 2017
 
January 31, 2016
Signal Integrity
$
263,015

 
45
 %
 
$
258,824

 
47
 %
 
$
221,185

 
46
%
Protection
176,482

 
30
 %
 
149,865

 
28
 %
 
138,674

 
28
%
Wireless and Sensing
117,596

 
20
 %
 
81,657

 
15
 %
 
70,712

 
14
%
Power and High-Reliability
46,973

 
8
 %
 
59,117

 
11
 %
 
54,999

 
11
%
Systems Innovation
—

 
—
 %
 
205

 
—
 %
 
4,649

 
1
%
Other: Warrant Shares
(16,219
)
 
(3
)%
 
(5,396
)
 
(1
)%
 
—

 
—
%
Total Net Sales
$
587,847

  
100
 %
 
$
544,272

  
100
 %
 
$
490,219

  
100
%
Net sales by geographic region
Sales activity by geographic region is as follows:
 
Fiscal Year Ended
(in thousands, except percentages)
January 28, 2018
 
January 29, 2017
 
January 31, 2016
Asia-Pacific
$
439,342

 
75
 %
 
$
412,167

 
76
 %
 
$
358,480

 
74
%
North America
121,144

 
21
 %
 
94,123

 
17
 %
 
46,152

 
9
%
Europe
43,580

 
7
 %
 
43,378

 
8
 %
 
85,587

 
17
%
Other: Warrant Shares
(16,219
)
 
(3
)%
 
(5,396
)
 
(1
)%
 
—

 
—
%
Total Net Sales
$
587,847

 
100
 %
 
$
544,272

 
100
 %
 
$
490,219

 
100
%
Sales activity to countries representing greater than 10% of total sales
The table below summarizes sales activity to countries that represented greater than 10% of total sales for at least one of the periods presented:
 
Fiscal Year Ended
(percentage of total net sales)
January 28, 2018
 
January 29, 2017
 
January 31, 2016
China (including Hong Kong)
51
%
 
48
%
 
47
%
United States
9
%
 
9
%
 
12
%
Total Net Sales
60
%
 
57
%
 
59
%
Long-lived assets by location
Long-lived assets, which consist of property, plant and equipment, net of accumulated depreciation and classified by location are summarized as follows:
 
Fiscal Year Ended
(in thousands)
January 28, 2018
 
January 29, 2017
United States
$
48,289

  
$
50,747

Rest of North America
34,941

 
30,435

Europe
9,752

 
8,821

Asia and all others
31,624

  
18,907

Total
$
124,606

 
$
108,910