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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 30, 2017
Share-Based Compensation |
Summary of option activity |
|  | Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value |
|  |  |  |  |  |  |  | (in thousands) |
Outstanding at December 31, 2016 |  |  | 945,083 |  | $ | 22.95 |  |  |  |  |  |  |
Fiscal 2017: |  |  |  |  |  |  |  |  |  |  |  |  |
Granted |  |  | 22,757 |  |  | 44.87 |  |  |  |  |  |  |
Exercised |  |  | (293,439 | ) |  | 21.88 |  |  |  |  | $ | 5,372 |
Expired |  |  | — |  |  | — |  |  |  |  |  |  |
Forfeited |  |  | (8,684 | ) |  | 24.58 |  |  |  |  |  |  |
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Outstanding at December 30, 2017 |  |  | 665,717 |  |  | 24.14 |  |  | 4.00 |  | $ | 13,851 |
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Options exercisable at December 30, 2017 |  |  | 456,639 |  | $ | 22.78 |  |  | 3.39 |  | $ | 10,123 |
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Vested or expected to vest at December 30, 2017 |  |  | 663,088 |  | $ | 24.13 |  |  | 4.00 |  | $ | 13,802 |
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Schedule of weighted average assumptions used to estimate the fair market value of the stock options at the date of grant |
|  | 2017 |  | 2016 |  | 2015 |
Risk-free interest rate |  |  | 2.1 | % |  | 1.3 | % |  | 1.4 | %
Expected volatility |  |  | 32 | % |  | 36 | % |  | 39 | %
Expected dividend yield |  |  | 1.5 | % |  | 1.5 | % |  | — |
Forfeiture rate |  |  | 0.4 | % |  | 0.5 | % |  | 1.1 | %
Weighted average expected life (in years) |  |  | 4.49 |  |  | 4.58 |  |  | 4.50 |
Summary of options outstanding and options exercisable |
|  | Options Outstanding |  | Options Exercisable |
Range of Exercise Prices |  | Number Outstanding at December 30, 2017 |  | Weighted-Average Remaining Contractual Life (years) |  | Weighted-Average Exercise Price |  | Number Exercisable at December 30, 2017 |  | Weighted-Average Remaining Contractual Life (years) |  | Weighted- Average Exercise Price |
$16.12 - 21.48 |  |  | 181,630 |  |  | 2.89 |  | $ | 18.48 |  |  | 181,630 |  |  | 2.89 |  | $ | 18.48 |
$21.49 - 26.86 |  |  | 276,737 |  |  | 4.07 |  |  | 21.60 |  |  | 158,035 |  |  | 3.48 |  |  | 21.66 |
$26.87 - 32.23 |  |  | 184,593 |  |  | 4.25 |  |  | 30.98 |  |  | 116,974 |  |  | 4.04 |  |  | 30.98 |
$42.98 - 48.35 |  |  | 22,757 |  |  | 9.97 |  |  | 44.87 |  |  | — |  |  | — |  |  | — |
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Total |  |  | 665,717 |  |  | 4.00 |  | $ | 24.14 |  |  | 456,639 |  |  | 3.39 |  | $ | 22.78 |
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Schedule of roll-forward of the outstanding non-vested stock options |
|  | Options |
|  | Number of Shares |  | Weighted-Average Fair Value |
Non-vested at December 31, 2016 |  |  | 367,120 |  | $ | 8.74 |
Granted |  |  | 22,757 |  |  | 11.54 |
Vested |  |  | (172,115 | ) |  | 8.80 |
Forfeited |  |  | (8,684 | ) |  | 8.95 |
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Non-vested at December 30, 2017 |  |  | 209,078 |  | $ | 8.98 |
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Schedule of roll-forward of shares of restricted stock |
|  | Shares of Restricted Stock |
|  | Number of Shares |  | Weighted-Average Fair Value |
Non-vested at December 31, 2016 |  |  | 62,122 |  | $ | 23.64 |
Granted |  |  | 16,494 |  |  | 36.36 |
Vested |  |  | (25,891 | ) |  | 22.93 |
Forfeited |  |  | — |  |  | — |
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Non-vested at December 30, 2017 |  |  | 52,725 |  | $ | 27.97 |
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Schedule of roll-forward of the time-vesting restricted stock units |
|  | Time-Vesting Restricted Stock Units |
|  | Number of Units |  | Weighted-Average Fair Value |
Non-vested at December 31, 2016 |  |  | 184,751 |  | $ | 24.18 |
Granted |  |  | 25,958 |  |  | 38.38 |
Vested |  |  | (86,547 | ) |  | 23.27 |
Forfeited |  |  | (4,342 | ) |  | 24.58 |
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Non-vested at December 30, 2017 |  |  | 119,820 |  | $ | 27.90 |
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Summary of outstanding non-vested performance-vesting restricted stock units |
|  | Performance-Vesting Restricted Stock Units |
|  | Number of Units |
Non-vested at January 3, 2015 |  |  | 365,468 |
Granted |  |  | 204,315 |
Vested |  |  | — |
Forfeited |  |  | (11,624 | )
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Non-vested at January 2, 2016 |  |  | 558,159 |
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Granted |  |  | 26,666 |
Vested |  |  | (90,485 | )
Forfeited |  |  | (83,187 | )
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Non-vested at December 31, 2016 |  |  | 411,153 |
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Granted |  |  | 32,721 |
Vested |  |  | (98,882 | )
Forfeited |  |  | (64,397 | )
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Non-vested at December 30, 2017 |  |  | 280,595 |
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