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STOCK-BASED COMPENSATION (Tables) | 3 Months Ended
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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 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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