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Stock-based and Deferred Compensation Plans (Tables)
 12 Months Ended
Dec. 27, 2015
Disclosure of Compensation Related Costs, Share-based Payments and Deferred Compensation [Abstract]  
Schedule of compensation cost for share-based payment arrangements, allocation of share-based compensation costs by award type
The Company recognized stock-based compensation expense as follows:
 
FISCAL YEAR
(dollars in thousands)
2015
 
2014
 
2013
Stock options
$
10,041

 
$
11,946

 
$
11,168

Restricted stock and restricted stock units
6,758

 
3,857

 
2,026

Performance-based share units
3,596

 
1,190

 
663

 
$
20,395

 
$
16,993

 
$
13,857
Schedule of share-based compensation, stock options, activity
The following table presents a summary of the Company’s stock option activity for fiscal year 2015:
(in thousands, except exercise price and contractual life)
OPTIONS
 
WEIGHTED-
AVERAGE
EXERCISE
PRICE
 
WEIGHTED-
AVERAGE
REMAINING
CONTRACTUAL
LIFE (YEARS)
 
AGGREGATE
INTRINSIC
VALUE
Outstanding as of December 28, 2014
9,777

 
$
11.59

 
6.2
 
$
120,461

Granted
1,184

 
25.26

 
 
 
 
Exercised
(804
)
 
9.58

 
 
 
 
Forfeited or expired
(439
)
 
21.40

 
 
 
 
Outstanding as of December 27, 2015
9,718

 
$
12.99

 
5.6
 
$
59,427

Vested and expected to vest as of December 27, 2015
9,662

 
$
12.93

 
5.6
 
$
59,417

Exercisable as of December 27, 2015
6,790

 
$
9.21

 
4.5
 
$
57,226
Schedule of assumptions used to calculate fair value of options
Assumptions used in the Black-Scholes option pricing model and the weighted-average fair value of option awards granted were as follows for the periods indicated:
 
FISCAL YEAR
 
2015
 
2014
 
2013
Assumptions:
 
 
 
 
 
Weighted-average risk-free interest rate (1)
1.64
%
 
1.82
%
 
1.22
%
Dividend yield (2)
1.00
%
 
—
%
 
—
%
Expected term (3)
6.3 years

 
6.3 years

 
6.3 years

Weighted-average volatility (4)
43.4
%
 
48.4
%
 
48.6
%
 
 
 
 
 
 
Weighted-average grant date fair value per option
$
10.11

 
$
11.37

 
$
9.14

________________
(1)
Risk-free rate is the U.S. Treasury yield curve in effect as of the grant date for periods within the contractual life of the option.
(2)
Dividend yield is the level of dividends expected to be paid on the Company’s common stock over the expected term of the option.
(3)
Expected term represents the period of time that the options are expected to be outstanding. The simplified method of estimating the expected term is used since the Company does not have significant historical exercise experience for its stock options.
(4)
Volatility is based on the historical volatilities of the Company’s stock and the stock of comparable peer companies.
Schedule of stock-based compensation information, stock options
The following represents stock option compensation information for the periods indicated:
 
FISCAL YEAR
(dollars in thousands)
2015
 
2014
 
2013
Intrinsic value of options exercised
$
11,843

 
$
19,474

 
$
42,661

Excess tax benefits for tax deductions related to the exercise of stock options
$
702

 
$
2,405

 
$
4,304

Cash received from option exercises, net of tax withholding
$
7,440

 
$
9,540

 
$
27,786

Fair value of stock options vested
$
26,643

 
$
36,614

 
$
47,468

Tax benefits for stock option compensation expense
$
4,594

 
$
7,576

 
$
4,381

 
 
 
 
 
 
Unrecognized stock option expense
$
21,060

 
 
 
 
Remaining weighted-average vesting period
2.5 years

 
 
 
 
Schedule of stock-based compensation, restricted stock and restricted stock units, activity
Following is a summary of the Company’s restricted stock and restricted stock unit activity for fiscal year 2015:
(shares in thousands)
NUMBER OF RESTRICTED STOCK & RESTRICTED STOCK UNIT AWARDS
 
WEIGHTED-AVERAGE
GRANT DATE
FAIR VALUE PER AWARD
Outstanding as of December 28, 2014
946

 
$
20.08

Granted
606

 
22.80

Vested
(271
)
 
19.68

Forfeited
(136
)
 
21.44

Outstanding as of December 27, 2015
1,145

 
$
21.48
Schedule of stock-based compensation information, restricted stock and restricted stock units
The following represents restricted stock and restricted stock unit compensation information as of December 27, 2015:
 
FISCAL YEAR
(dollars in thousands)
2015
 
2014
 
2013
Fair value of restricted stock vested
$
5,339

 
$
2,680

 
$
1,597

Tax benefits for restricted stock compensation expense
$
2,303

 
$
1,298

 
$
817

 
 
 
 
 
 
Unrecognized restricted stock expense
$
18,638

 
 
 
 
Remaining weighted-average vesting period
2.8 years

 
 
 
 
Schedule of other share-based compensation, activity
At December 27, 2015, the following performance-based share unit (“PSUs”) programs were in progress:
 
 
TARGET NO. OF PSUs REMAINING TO GRANT (1)
(shares in thousands)
 
MAXIMUM PAYOUT
(AS A % OF TARGET
NO. OF PSUs) (2)
AWARD DATE
 
PROGRAM
 
 
2/26/2013
 
2013 Program
 
29

 
200
%
4/24/2013
 
2013 Grant
 
6

 
100
%
2/27/2014
 
2014 Program
 
96

 
200
%
2/26/2015
 
2015 Program
 
179

 
200
%
3/2/2015
 
2015 Int’l Program
 
15

 
100
%
 
 
 
 
324

 
 
________________
(1)
Represents target PSUs awarded under each of the identified programs that have not been granted for accounting purposes. These PSUs do not result in the recognition of stock-based compensation expense until the performance target has been set by the Board as of the beginning of each fiscal year. There is no effect of these PSUs on the Company’s basic or diluted shares outstanding.
(2)
Assumes achievement of target threshold of Adjusted Net Income goals for the Company or Adjusted Earnings Before Interest, Taxes (“Adjusted EBIT”) for the respective concepts for the 2013 Program or 2013 Grant, achievement of target threshold of the Adjusted EPS goal for the Company for the 2014 Program and 2015 program. Assumes achievement of target threshold of Adjusted EBIT for certain international markets for the 2015 Programs.

Schedule of nonvested performance-based units, activity
The following table presents a summary of the Company’s PSU activity for fiscal year 2015:
(shares in thousands)
PERFORMANCE-BASED SHARE UNITS
 
WEIGHTED-AVERAGE
GRANT DATE
FAIR VALUE PER AWARD
Outstanding as of December 28, 2014
92

 
$
25.08

Granted (1)
184

 
24.23

Vested
(67
)
 
24.72

Forfeited
(43
)
 
24.65

Outstanding as of December 27, 2015
166

 
$
24.11

________________
(1)
Share unit amounts include the number of PSUs at the target threshold in the current period grant and additional shares earned above target due to exceeding prior period performance criteria.
Schedule of employee service share-based compensation, allocation of recognized period costs
The following represents PSU compensation information as of December 27, 2015:
 
FISCAL YEAR
(dollars in thousands)
2015
Tax benefits for PSU compensation expense (1)
$
636

Unrecognized PSU expense
$
871

Remaining weighted-average vesting period
0.3 years

________________
(1)
The Company recognized nominal tax benefits for PSU compensation expense during fiscal years 2014 and 2013.