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Stock Plans (Tables)
 12 Months Ended
Dec. 28, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Total Compensation Recognized Related to Outstanding Equity Awards
The following table summarizes total pre-tax compensation expense recognized related to the Company’s stock options, restricted stock, restricted stock units, performance units and stock grants, net of estimated forfeitures, included in the Company’s consolidated statements of operations for fiscal years 2014, 2013, and 2012:
 
 
December 28,
2014
 
December 29,
2013
 
December 30,
2012
 
(In thousands)
Cost of product and service revenue
$
1,456

 
$
1,304

 
$
1,247

Research and development expenses
546

 
853

 
747

Selling, general and administrative expenses
12,462

 
11,896

 
18,631

Continuing operations stock-based compensation expense
14,464

 
14,053

 
20,625

Discontinued operations stock-based compensation expense
—

 
—

 
406

Total stock-based compensation expense
$
14,464

 
$
14,053

 
$
21,031
Weighted-Average Assumptions Used in the Black-Scholes Option Pricing Model
The Company’s weighted-average assumptions used in the Black-Scholes option pricing model were as follows for the fiscal years ended:
 
 
December 28,
2014
 
December 29,
2013
 
December 30,
2012
Risk-free interest rate
1.5
%
 
0.9
%
 
0.6
%
Expected dividend yield
0.7
%
 
0.8
%
 
1.2
%
Expected lives
5 years

 
5 years

 
4 years

Expected stock volatility
30.9
%
 
38.5
%
 
38.7
%
Summary of Stock Option Activity
The following table summarizes stock option activity for the three fiscal years ended December 28, 2014:
 
 
December 28, 2014
 
December 29, 2013
 
December 30, 2012
 
Number
of
Shares
 
Weighted-
Average Exercise
Price
 
Number
of
Shares
 
Weighted-
Average Exercise
Price
 
Number
of
Shares
 
Weighted-
Average Exercise
Price
 
(Shares in thousands)
Outstanding at beginning of year
3,494

 
$
23.34

 
4,266

 
$
21.64

 
5,346

 
$
20.57

Granted
520

 
43.12

 
518

 
33.62

 
756

 
26.28

Exercised
(1,024
)
 
23.89

 
(947
)
 
21.45

 
(1,611
)
 
20.16

Canceled
(4
)
 
20.97

 
(8
)
 
22.88

 
(210
)
 
22.34

Forfeited
(158
)
 
35.33

 
(335
)
 
23.04

 
(15
)
 
21.98

Outstanding at end of year
2,828

 
$
26.11

 
3,494

 
$
23.34

 
4,266

 
$
21.64

Exercisable at end of year
1,900

 
$
21.13

 
2,392

 
$
20.66

 
2,677

 
$
20.00
Summary of Restricted Stock Award Activity
The following table summarizes restricted stock award activity for the three fiscal years ended December 28, 2014:
 
 
December 28, 2014
 
December 29, 2013
 
December 30, 2012
 
Number
of
Shares
 
Weighted-
Average
Grant-
Date Fair
Value
 
Number
of
Shares
 
Weighted-
Average
Grant-
Date Fair
Value
 
Number
of
Shares
 
Weighted-
Average
Grant-
Date Fair
Value
 
(Shares in thousands)
Nonvested at beginning of year
649

 
$
29.24

 
781

 
$
24.71

 
672

 
$
23.62

Granted
261

 
42.61

 
289

 
33.87

 
358

 
25.86

Vested
(258
)
 
27.64

 
(346
)
 
22.98

 
(184
)
 
23.19

Forfeited
(94
)
 
33.58

 
(75
)
 
28.76

 
(65
)
 
24.03

Nonvested at end of year
558

 
$
33.51

 
649

 
$
29.24

 
781

 
$
24.71