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STOCK-BASED COMPENSATION (Tables)
 3 Months Ended
Mar. 28, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of stock-based compensation expense
Stock-based compensation expense was as follows (in millions):
 
Thirteen weeks ended
 
March 28,
2014
 
March 29,
2013
Restricted and unrestricted stock and performance share units
$
2.7

 
$
2.8

Stock options
0.1

 
—

Employee stock purchase plan
0.1

 
0.1

Total stock-based compensation
$
2.9

 
$
2.9
Schedule of restricted and unrestricted stock and performance share units activity
Restricted and unrestricted stock and performance share units activity for the thirteen weeks ended March 28, 2014 was as follows (shares in thousands):
 
Shares
 
Weighted- average grant-date price
Non-vested at beginning of period
1,544

 
$
16.66

Granted
350

 
$
25.20

Vested
(357
)
 
$
17.77

Forfeited
(11
)
 
$
17.81

Non-vested at the end of the period
1,526

 
$
18.25
Schedule of stock option activity
Stock option activity for the thirteen weeks ended March 28, 2014 was as follows (shares in thousands):
 
Shares
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Life
 
Aggregate Intrinsic Value (in millions)
Outstanding, December 27, 2013
74

 
$
14.99

 
 
 
 
Granted
7

 
$
25.26

 
 
 
 
Exercised
(17
)
 
$
15.17

 
 
 
 
Expired/Forfeited
(1
)
 
$
18.98

 
 
 
 
Outstanding, March 28, 2014
63

 
$
15.95

 
2.14
 
$
0.8

Exercisable, March 28, 2014
63

 
$
15.95

 
2.14
 
$
0.8
Schedule of summary of the weighted average assumptions and results for stock options granted
A summary of the weighted average assumptions and results for stock options granted during the thirteen weeks ended March 28, 2014 is as follows:
 
 
March 28,
2014
Expected life (in years)
3.72

Expected volatility
42.8
%
Risk-free interest rate
0.7
%
Expected dividend yield
—
%
Weighted average fair value of options granted during the period
$
8.31