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Equity incentive plans (Tables)
 12 Months Ended
Dec. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total share based compensation expense
Total share-based compensation expense, which is included in general and administrative expenses, net, consisted of the following (in thousands):
 
Fiscal year ended
 
December 30, 2017
 
December 31, 2016
 
December 26, 2015
Time-vested stock options
$
8,611

 
10,654

 
10,519

Restricted stock units
4,337

 
3,608

 
3,408

2011 Plan restricted shares
701

 
1,793

 
1,967

Performance stock units
1,277

 
1,086

 
—

Other
—

 
40

 
198

Total share-based compensation
$
14,926

 
17,181

 
16,092

Total related tax benefit
$
8,339

 
6,955

 
6,512
Summary of valuation assumptions
The following weighted average assumptions were utilized in determining the fair value of the 2015 Plan options granted during fiscal years 2017 and 2016 and the 2011 Plan options granted during fiscal year 2015:
 
Fiscal year ended
 
December 30, 2017
 
December 31, 2016
 
December 26, 2015
Weighted average grant-date fair value of share options granted
$
9.87

 
$
7.41

 
$
8.66

Weighted average assumptions:
 
 
 
 
 
Risk-free interest rate
1.9
%
 
1.2
%
 
1.5
%
Expected volatility
24.0
%
 
25.0
%
 
25.0
%
Dividend yield
2.3
%
 
2.7
%
 
2.2
%
Expected term (years)
4.88

 
4.90

 
4.91
Summary of status of nonexecutive and 2011 Plan options
A summary of the status of the time-vested stock options as of December 30, 2017 and changes during fiscal year 2017 is presented below:
 
Number of
shares
 
Weighted
average
exercise
price
 
Weighted
average
remaining
contractual
term (years)
 
Aggregate
intrinsic
value
(in millions)
Share options outstanding at December 31, 2016
4,889,585

 
$
44.82

 
5.3
 
 
Granted
1,181,777

 
55.04

 
 
 
 
Exercised
(880,346
)
 
40.37

 
 
 
 
Forfeited or expired
(823,489
)
 
49.38

 
 
 
 
Share options outstanding at December 30, 2017
4,367,527

 
47.63

 
4.6
 
$
73.6

Share options exercisable at December 30, 2017
2,026,779

 
44.99

 
3.9
 
39.5
Restricted Stock Units (RSUs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of changes in resticted shares
A summary of the changes in the Company’s restricted stock units during fiscal year 2017 is presented below:
 
Number of
shares
 
Weighted average grant-date fair value
 
Weighted
average
remaining
contractual
term (years)
 
Aggregate
intrinsic
value
(in millions)
Nonvested restricted stock units at December 31, 2016
183,676

 
$
44.91

 
1.7
 
 
Granted
91,272

 
52.44

 
 
 
 
Vested
(90,976
)
 
45.37

 
 
 
 
Forfeited
(8,546
)
 
46.37

 
 
 
 
Nonvested restricted stock units at December 30, 2017
175,426

 
48.51

 
1.5
 
$
11.3
Performance shares  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of share-based compensation arrangement by share-based payment award, performance-based units, vested and expected to vest
A summary of the changes in the Company’s PSUs during fiscal year 2017 is presented below:
 
Number of
shares
 
Weighted average grant-date fair value
 
Weighted
average
remaining
contractual
term (years)
 
Aggregate
intrinsic
value
(in millions)
Nonvested performance stock units at December 31, 2016
113,041

 
$
47.90

 
2.3
 
 
Granted
84,705

 
59.03

 
 
 
 
Forfeited
(49,160
)
 
44.89

 
 
 
 
Nonvested performance stock units at December 30, 2017
148,586

 
52.72

 
1.7
 
$
9.6