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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 27, 2013
Share-based Compensation [Abstract]  
Stock-Based Compensation Expense Included in Selling, General and Administrative Expenses Related to Stock Options and Restricted Stock Awards
Stock-based compensation expense included in selling, general and administrative expenses related to stock options on a straight-line, single award basis, restricted stock awards and restricted stock units included in the accompanying Consolidated Statements of Income was as follows (U.S. dollars in millions, except per share data):
 
 
Year ended
 
December 27, 2013
 
December 28, 2012
 
December 30, 2011
Stock-based compensation expense
$
9.9

 
$
10.3

 
$
9.2
Stock Option Activity
The following table summarizes stock option activity for the years ended December 27, 2013, December 28, 2012 and December 30, 2011:

 
Number of
Shares
 
Weighted
Average
Exercise Price
 
Weighted
Average Fair
Value
Options outstanding at December 31, 2010
4,882,901

 
$
22.82

 
$
8.44

Granted
1,081,000

 
24.19

 
8.65

Exercised
(1,166,849
)
 
19.52

 
7.19

Cancelled
(60,000
)
 
26.82

 
10.05

 
 
 
 
 
 
Options outstanding at December 30, 2011
4,737,052

 
23.90

 
8.74

Granted
986,000

 
23.99

 
8.40

Exercised
(475,918
)
 
21.29

 
7.86

Cancelled
(52,000
)
 
27.13

 
10.07

 
 
 
 
 
 
Options outstanding at December 28, 2012
5,195,134

 
24.12

 
8.77

Granted
756,000

 
27.74

 
8.11

Exercised
(1,975,339
)
 
22.26

 
8.22

Cancelled
(3,000
)
 
24.29

 
8.44

 
 
 
 
 
 
Options outstanding at December 27, 2013
3,972,795

 
$
25.74

 
$
8.37

 
 
 
 
 
 
Exercisable at December 30, 2011
2,908,052

 
$
24.48

 
$
9.00

 
 
 
 
 
 
Exercisable at December 28, 2012
3,460,134

 
$
24.43

 
$
8.96

 
 
 
 
 
 
Exercisable at December 27, 2013
2,349,795

 
$
26.00

 
$
9.32
Stock Option Grants
The following table lists the various stock option grants occurring for the years ended December 27, 2013 and December 28, 2012:

Stock Option Grant
Number of
Options
Granted
 
Exercise
Price
 
Fair Value
 
July 31, 2013 - Employees
446,000

 
$
28.09

 
$
8.46

(1) 
July 31, 2013 - Employees
149,000

 
28.01

 
6.79

(2) 
February 20, 2013 - Chairman and Chief Executive Officer
161,000

 
26.52

 
8.38

(1) 
August 1, 2012 - Employees
825,000

 
24.29

 
8.44

(1) 
February 29, 2012 - Chairman and Chief Executive Officer
161,000

 
22.46

 
8.15

(1) 


(1) Option granted under the 2011 Plan based on daily closing stock prices.
(2) Option granted under the 1999 Plan based on daily average of high and low stock prices.
Weighted Average Assumptions Used in Black-Scholes Option Pricing Model
The following are the weighted average assumptions used in the Black-Scholes option pricing model for the periods indicated:
 
 
Year ended
 
December 27, 2013
 
December 28, 2012
 
December 30, 2011
Volatility
37.98
%
 
46.18
%
 
45.40
%
Risk-free rate
1.27
%
 
0.67
%
 
1.39
%
Dividend yield
1.80
%
 
1.64
%
 
1.54
%
Expected term of grant
5.0 years

 
5.0 years

 
5.0 years
Stock Options - Outstanding and Exercisable
Information about stock options outstanding at December 27, 2013 was as follows:

Exercise
Price
Remaining
Contractual
Life
 
Outstanding
 
Outstanding
Intrinsic Value
 
Exercisable
 
Exercisable
Intrinsic Value
$
14.77

5.3 years
 
30,000

 
$
0.4

 
30,000

 
$
0.4

$
15.78

2.6 years
 
52,000

 
0.7

 
52,000

 
0.7

$
17.35

3.2 years
 
6,250

 
0.1

 
6,250

 
0.1

$
18.31

2.3 years
 
6,000

 
0.1

 
6,000

 
0.1

$
19.76

2.2 years
 
6,250

 
0.1

 
6,250

 
0.1

$
19.83

5.2 years
 
18,750

 
0.2

 
18,750

 
0.2

$
20.13

6.2 years
 
32,200

 
0.3

 
—

 
—

$
21.72

5.6 years
 
330,400

 
2.2

 
330,400

 
2.2

$
22.25

4.6 years
 
306,994

 
1.9

 
306,994

 
1.9

$
22.46

8.2 years
 
96,600

 
0.6

 
—

 
—

$
23.76

7.6 years
 
597,400

 
2.7

 
255,400

 
1.2

$
24.29

8.6 years
 
690,400

 
2.8

 
207,400

 
0.8

$
26.52

9.1 years
 
161,000

 
0.3

 
32,200

 
0.1

$
26.67

7.2 years
 
161,000

 
0.3

 
96,600

 
0.2

$
28.01

9.6 years
 
149,000

 
0.1

 
29,800

 
—

$
28.09

9.6 years
 
446,000

 
0.1

 
89,200

 
—

$
29.84

1.3 years
 
635,051

 
—

 
635,051

 
—

$
30.59

3.9 years
 
24,000

 
—

 
24,000

 
—

$
32.28

1.1 years
 
25,000

 
—

 
25,000

 
—

$
33.97

4.2 years
 
161,000

 
—

 
161,000

 
—

$
33.97

4.2 years
 
37,500

 
—

 
37,500

 
—

 
 
 
3,972,795

 
$
12.9

 
2,349,795

 
$
8.0
Restricted Stock Units Award Activity
The following table lists the various restricted stock awards and related compensation expense under the Director's Equity Plan for the years ended December 27, 2013 and December 28, 2012 (U.S. dollars in millions except share and per share data):

Date of Award
Number of
Restricted Stock
Awarded
 
Price Per Share
 
Compensation Expense
January 2, 2013
26,201
 
$
26.72

 
$
0.7

January 3, 2012
27,573
 
$
25.39

 
$
0.7