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Stock-Based Compensation (Tables)
 12 Months Ended
Jan. 01, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
The components and classification of stock-based compensation expense were as follows (in thousands):
 
Year Ended
 
January 1,
2016
 
January 2,
2015
 
January 3,
2014
Stock options
$
2,708

 
$
2,523

 
$
3,490

Restricted stock and units
6,668

 
6,417

 
5,843

401(k) stock contribution
—

 
4,246

 
4,768

Total stock-based compensation expense
$
9,376

 
$
13,186

 
$
14,101

 
 
 
 
 
 
Cost of sales
$
795

 
$
3,530

 
$
3,864

Selling, general and administrative expenses
7,510

 
7,923

 
7,907

Research, development and engineering costs, net
982

 
1,440

 
1,194

Other operating expenses, net (Note 13)
89

 
293

 
1,136

Total stock-based compensation expense
$
9,376

 
$
13,186

 
$
14,101
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The weighted-average fair value and assumptions used are as follows:
 
Year Ended
 
January 1,
2016
 
January 2,
2015
 
January 3,
2014
Weighted average grant date fair value
$
12.18

 
$
16.43

 
$
8.38

Risk-free interest rate
1.55
%
 
1.73
%
 
0.73
%
Expected volatility
26
%
 
39
%
 
39
%
Expected life (in years)
4.7

 
5.3

 
5.3

Expected dividend yield
0
%
 
0
%
 
0
%
Annual prevesting forfeiture rate
9
%
 
9
%
 
9
%
Schedule of Share-based Compensation, Stock Options, Activity
The following table summarizes time and performance-vested stock option activity:
 
Number of
Stock
Options
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Life
(In Years)
 
Aggregate
Intrinsic
Value
(In Millions)
Outstanding at December 28, 2012
2,060,772

 
$
23.18

 
 
 
 
Granted
372,676

 
23.33

 
 
 
 
Exercised
(551,092
)
 
23.24

 
 
 
 
Forfeited or expired
(88,686
)
 
28.05

 
 
 
 
Outstanding at January 3, 2014
1,793,670

 
22.96

 
 
 
 
Granted
183,571

 
43.84

 
 
 
 
Exercised
(353,625
)
 
23.41

 
 
 
 
Forfeited or expired
(33,279
)
 
27.82

 
 
 
 
Outstanding at January 2, 2015
1,590,337

 
25.17

 
 
 
 
Granted
301,547

 
49.20

 
 
 
 
Replacement options granted in connection with the Lake Region Medical acquisition
119,900

 
12.41

 
 
 
 
Exercised
(280,701
)
 
23.45

 
 
 
 
Forfeited or expired
(52,183
)
 
42.45

 
 
 
 
Outstanding at January 1, 2016
1,678,900

 
$
28.32

 
6.1
 
$
40.6

Expected to vest at January 1, 2016
1,643,386

 
$
27.90

 
6.1
 
$
40.4

Exercisable at January 1, 2016
1,467,256

 
$
25.50

 
5.8
 
$
39.6
Schedule Of Stock Option Exercise Information
The following table provides certain information relating to the exercise of stock options (in thousands):
 
Year Ended
 
January 1,
2016
 
January 2,
2015
 
January 3,
2014
Intrinsic value
$
8,231

 
$
7,997

 
$
6,807

Cash received
6,583

 
8,278

 
12,807

Tax benefit realized
1,954

 
1,704

 
727
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
The following table summarizes time-vested restricted stock and unit activity:
 
Time-Vested
Activity
 
Weighted
Average
Fair Value
Nonvested at December 28, 2012
80,269

 
$
23.48

Granted
67,230

 
26.76

Vested
(74,062
)
 
23.93

Forfeited
(5,862
)
 
22.26

Nonvested at January 3, 2014
67,575

 
26.37

Granted
63,817

 
44.78

Vested
(53,568
)
 
34.16

Forfeited
(9,992
)
 
35.30

Nonvested at January 2, 2015
67,832

 
36.22

Granted
44,629

 
49.84

Vested
(56,119
)
 
37.93

Forfeited
(17,107
)
 
40.48

Nonvested at January 1, 2016
39,235

 
$
47.40

The following table summarizes performance-vested restricted stock and stock unit activity related to the Company’s plans: 
 
Performance-
Vested
Activity
 
Weighted
Average
Fair Value
Nonvested at December 28, 2012
782,446

 
$
16.02

Granted
318,169

 
15.86

Vested
(49,139
)
 
14.68

Forfeited
(271,798
)
 
14.94

Nonvested at January 3, 2014
779,678

 
16.41

Granted
186,825

 
31.33

Vested
(221,470
)
 
18.51

Forfeited
(28,870
)
 
18.42

Nonvested at January 2, 2015
716,163

 
19.57

Granted
179,940

 
32.92

Vested
(270,198
)
 
15.30

Forfeited
(48,080
)
 
26.96

Nonvested at January 1, 2016
577,825

 
$
25.11