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Stock Incentive Plans (Tables) | 12 Months Ended
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Dec. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of status of the Company's stock option plans | The tables below summarize the status of the Company’s stock option plans (in thousands, except per share data and exercise price):
|  | Stock Options
|  | Shares |  | Weighted Average Exercise Price
Outstanding, December 31, 2017 |  | 469 |  |  | $ | 54.60 |
Granted |  | 128 |  |  | 60.42 |
Forfeited/expired |  | (95 | ) |  | 57.98 |
Exercised |  | (19 | ) |  | 26.12 |
Outstanding, December 30, 2018 |  | 483 |  |  | $ | 56.62 |
|  | Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Years of Contractual Life |  | Aggregate Intrinsic Value
Outstanding as of December 30, 2018 |  | 483 |  |  | $ | 56.62 |  |  | 6.82 |  | $ | 67 |
Vested and expected to vest as of December 30, 2018 (1) |  | 444 |  |  | $ | 56.62 |  |  | 6.66 |  | $ | 67 |
Exercisable as of December 30, 2018 |  | 246 |  |  | $ | 55.59 |  |  | 5.36 |  | $ | 67 |
___________________________________ (1) The expected to vest options are the result of applying the pre-vesting forfeiture rate assumption to total outstanding options. The Company applies estimated forfeiture rates that are derived from our historical forfeitures of similar awards.
Schedule of average assumptions used in estimation of fair value of options | The estimated fair value of each option granted is calculated using the Black-Scholes multiple option-pricing model. The average assumptions used in the model for the fiscal years ended December 30, 2018, December 31, 2017, and December 25, 2016 were as follows:
| 2018 |  | 2017 |  | 2016 |
Risk-free interest rate | 2.5 |  | % |  | 1.8 |  | % |  | 1.2 |  | % |
Expected years until exercise | 3.2 |  |  |  | 5.0 |  |  |  | 4.5 |  |  |
Expected stock volatility | 43.4 |  | % |  | 37.9 |  | % |  | 39.0 |  | % |
Dividend yield | — |  | % |  | — |  | % |  | — |  | % |
Weighted average Black-Scholes fair value per share at date of grant | $ | 16.56 |  |  |  | $ | 17.11 |  |  |  | $ | 20.45 |  |  |
Total intrinsic value of options exercised (in thousands) | $ | 390 |  |  |  | $ | 1,676 |  |  |  | $ | 2,624 |  |  |
Summary of the status of the Company's restricted stock units | The table below summarizes the status of the Company’s time-based RSUs under the 2017 and 2007 Stock Plans (shares in thousands):
|  | Restricted Stock Units
|  | Shares |  | Weighted Average Grant-Date Fair Value (per share)
Outstanding, December 31, 2017 |  | 102 |  |  | $ | 57.51 |
Awarded |  | 80 |  |  | 52.64 |
Forfeited |  | (24 | ) |  | 55.09 |
Vested |  | (39 | ) |  | 62.51 |
Outstanding, December 30, 2018 |  | 119 |  |  | $ | 53.13 |
Summary of status of Company's performance based stock units | The table below summarizes the status of the Company’s performance stock units under the 2017 Stock Plan (shares in thousands):
|  | Performance Stock Units
|  | Shares |  | Weighted Average Grant-Date Fair Value (per share)
Outstanding, December 31, 2017 |  | 30 |  |  | $ | 48.87 |
Awarded |  | 38 |  |  | 61.25 |
Forfeited |  | (5 | ) |  | 61.25 |
Vested |  | — |  |  | — |
Outstanding, December 30, 2018 |  | 63 |  |  | $ | 55.35 |

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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding performance-based awards that are fully vested and expected to vest. Includes, but is not limited to, unvested awards for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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