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Share Based Compensation (Tables)
 12 Months Ended
Dec. 28, 2013
Share-based Compensation [Abstract]  
Key assumptions in fair value determination
The ranges of key assumptions used in determining the fair value of options granted during fiscal 2013, 2012 and 2011, as well as a summary of the methodology applied to develop each assumption, are as follows:
 
Fiscal Year
 
2013
 
2012
 
2011
Expected price volatility
30.7 – 35.4%
 
37.1 – 38.5%
 
38.0 – 38.7%
Risk-free interest rate
0.6 – 1.2%
 
0.6 – 0.8%
 
0.9 – 2.4%
Weighted average expected lives (in years)
4.7
 
4.7
 
4.7 – 5.6
Forfeiture rate
7.0%
 
7.0%
 
5.5 – 7.6%
Dividend yield
0.8%
 
0.7%
 
0.8 – 1.0%
Summary of stock option activity
A summary of stock option activity is as follows:
 
Options
 
Weighted
Average Exercise
Price
 
Weighted Average Fair Value
 
Weighted Average
Remaining
Contractual Term
 
Aggregate Intrinsic Value
(in thousands)
Outstanding December 25, 2010
9,029,714

 
$
10.76

 
 

 
6.7
 
$
121,350

Granted
1,093,310

 
26.09

 
$
8.87

 
 
 
 

Exercised
(2,888,014
)
 
10.09

 
 

 
 
 
 

Canceled
(131,260
)
 
16.65

 
 

 
 
 
 

 
 
 
 
 
 
 
 
 
 
Outstanding December 31, 2011
7,103,750

 
$
13.29

 
 

 
6.5
 
$
154,782

Granted
1,146,504

 
42.79

 
$
13.13

 
 
 
 
Exercised
(2,132,896
)
 
11.04

 
 
 
 
 
 
Canceled
(56,976
)
 
30.39

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Outstanding December 29, 2012
6,060,382

 
$
19.48

 
 

 
6.6
 
$
147,229

Granted
1,027,251

 
51.87

 
$
14.67

 
 
 
 
Exercised
(2,681,225
)
 
12.95

 
 
 
 
 
 
Canceled
(97,360
)
 
43.27

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Outstanding December 28, 2013
4,309,048

 
$
30.72

 
 
 
7.1
 
$
193,123

 
 
 
 
 
 
 
 
 
 
Exercisable at December 28, 2013
2,289,115

 
$
18.51

 
 

 
5.9
 
$
130,549
Other information relative to option activity
Other information relative to option activity during fiscal 2013, 2012 and 2011 is as follows (in thousands):
 
2013
 
2012
 
2011
Total fair value of stock options vested
$
10,535

 
$
8,826

 
$
7,590

Total intrinsic value of stock options exercised
$
122,621

 
$
71,879

 
$
59,712
Restricted stock units activity
The status of restricted stock units is presented below:

Restricted Stock Units
 
Shares
 
Weighted Average Grant Date Fair Value
Restricted at December 25, 2010
 
1,100,356

 
$
10.31

Granted
 
126,968

 
26.62

Exercised
 
(176,780
)
 
10.41

Forfeited
 
—

 
—

 
 
 
 
 
Restricted at December 31, 2011
 
1,050,544

 
$
12.26

Granted
 
80,034

 
43.55

Exercised
 
(527,184
)
 
10.50

Forfeited
 
—

 
—

 
 
 
 
 
Restricted at December 29, 2012
 
603,394

 
$
18.76

Granted
 
59,864

 
51.72

Exercised
 
(244,462
)
 
14.00

Forfeited
 
(5,638
)
 
36.24

 
 
 
 
 
Restricted at December 28, 2013
 
413,158

 
$
26.12
Other information relative to restricted unit activity
Other information relative to restricted unit activity during fiscal 2013, 2012 and 2011 is as follows (in thousands):
 
2013
 
2012
 
2011
Total grant date fair value of restricted units vested and issued
$
3,422

 
$
5,533

 
$
1,840

Total intrinsic value of restricted units vested and issued
$
12,876

 
$
21,694

 
$
4,915