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Share Based Compensation (Tables)
 12 Months Ended
Dec. 27, 2014
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 2014, 2013 and 2012, as well as a summary of the methodology applied to develop each assumption, are as follows:
 
Fiscal Year
 
2014
 
2013
 
2012
Expected price volatility
28.0 – 29.3%
 
30.7 – 35.4%
 
37.1 – 38.5%
Risk-free interest rate
1.1 – 1.3%
 
0.6 – 1.2%
 
0.6 – 0.8%
Weighted average expected lives (in years)
4.5
 
4.7
 
4.7
Forfeiture rate
6.9%
 
7.0%
 
7.0%
Dividend yield
0.8%
 
0.8%
 
0.7%
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 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

Granted
1,167,060

 
64.08

 
$
15.36

 
 
 
 
Exercised
(1,179,175
)
 
20.15

 
 
 
 
 
 
Canceled
(213,507
)
 
57.14

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Outstanding December 27, 2014
4,083,426

 
$
41.93

 
 
 
7.2
 
$
146,967

 
 
 
 
 
 
 
 
 
 
Exercisable at December 27, 2014
2,171,934

 
$
28.38

 
 

 
5.9
 
$
107,603
Other information relative to option activity
Other information relative to option activity during fiscal 2014, 2013 and 2012 is as follows (in thousands):
 
2014
 
2013
 
2012
Total fair value of stock options vested
$
10,855

 
$
10,535

 
$
8,826

Total intrinsic value of stock options exercised
$
60,656

 
$
122,621

 
$
71,879
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 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

Granted
 
97,817

 
70.09

Exercised
 
(212,156
)
 
21.91

Forfeited
 
(21,472
)
 
54.54

 
 
 
 
 
Restricted at December 27, 2014
 
277,347

 
$
42.64
Other information relative to restricted unit activity
Other information relative to restricted stock unit activity during fiscal 2014, 2013 and 2012 is as follows (in thousands):
 
2014
 
2013
 
2012
Total grant date fair value of restricted stock units vested and issued
$
4,647

 
$
3,422

 
$
5,533

Total intrinsic value of restricted stock units vested and issued
$
13,205

 
$
12,876

 
$
21,694