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Share Based Compensation (Tables)
 12 Months Ended
Dec. 30, 2017
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 2017, 2016 and 2015, as well as a summary of the methodology applied to develop each assumption, are as follows:
 
Fiscal Year
 
2017
 
2016
 
2015
Expected price volatility
25.1 - 26.0%

 
25.5 - 27.9%

 
27.3 – 28.8%
Risk-free interest rate
1.7 - 1.9%

 
0.9 - 1.3%

 
1.2 – 1.5%
Weighted average expected lives (in years)
4.4

 
4.4

 
4.5
Forfeiture rate
7.2
%
 
7.1
%
 
6.9%
Dividend yield
1.3
%
 
0.9
%
 
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 27, 2014
4,083,426

 
$
41.93

 
 

 
7.2
 
$
146,967

Granted
1,080,490

 
83.70

 
$
19.53

 
 
 
 
Exercised
(1,116,828
)
 
33.11

 
 
 
 
 
 
Canceled
(185,582
)
 
67.28

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Outstanding December 26, 2015
3,861,506

 
$
54.95

 
 
 
7.1
 
$
119,050

Granted
1,150,941

 
86.05

 
$
19.27

 
 
 
 
Exercised
(851,118
)
 
42.53

 
 
 
 
 
 
Canceled
(187,582
)
 
80.01

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Outstanding December 31, 2016
3,973,747

 
$
65.43

 
 
 
6.9
 
$
59,601

Granted
1,625,140

 
72.11

 
$
14.56

 
 
 
 
Exercised
(309,904
)
 
38.87

 
 
 
 
 
 
Canceled
(290,457
)
 
79.08

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Outstanding December 30, 2017
4,998,526

 
$
68.46

 
 
 
6.9
 
$
50,145

 
 
 
 
 
 
 
 
 
 
Exercisable at December 30, 2017
2,582,283

 
$
60.46

 
 
 
5.3
 
$
45,939
Other information relative to option activity
Other information relative to option activity during fiscal 2017, 2016 and 2015 is as follows (in thousands):
 
2017
 
2016
 
2015
Total fair value of stock options vested
$
15,996

 
$
15,184

 
$
13,207

Total intrinsic value of stock options exercised
$
9,237

 
$
39,696

 
$
60,082
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 27, 2014
 
277,347

 
$
42.64

Granted
 
56,052

 
84.86

Exercised
 
(107,548
)
 
25.97

Forfeited
 
(6,234
)
 
63.57

 
 
 
 
 
Restricted at December 26, 2015
 
219,617

 
$
60.99

Granted
 
59,586

 
83.22

Exercised
 
(58,503
)
 
52.51

Forfeited
 
(26,669
)
 
76.51

 
 
 
 
 
Restricted at December 31, 2016
 
194,031

 
$
68.04

Granted
 
85,049

 
66.34

Exercised
 
(51,069
)
 
64.64

Forfeited
 
(4,781
)
 
79.65

 
 
 
 
 
Restricted at December 30, 2017
 
223,230

 
$
67.92
Other information relative to restricted unit activity
Other information relative to restricted stock unit activity during fiscal 2017, 2016 and 2015 is as follows (in thousands):
 
2017
 
2016
 
2015
Total grant date fair value of restricted stock units vested and issued
$
3,301

 
$
3,072

 
$
2,793

Total intrinsic value of restricted stock units vested and issued
$
3,465

 
$
5,104

 
$
9,139