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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 30, 2017
Compensation Related Costs [Abstract] |
Summary of the stock option activity under the plans |
|  | Years Ended
|  | December 30, |  | December 31, |  | December 26,
|  | 2017 |  | 2016 |  | 2015
|  |  |  | Weighted |  |  |  | Weighted |  |  |  | Weighted
|  |  |  | Average |  |  |  | Average |  |  |  | Average
|  |  |  | Exercise |  |  |  | Exercise |  |  |  | Exercise
|  | Shares |  | Price |  | Shares |  | Price |  | Shares |  | Price
Outstanding at beginning of year |  | 353 |  | $ | 28.59 |  | 769 |  | $ | 28.00 |  | 1,367 |  | $ | 26.71
Granted |  | - |  |  | - |  | - |  |  | - |  | - |  |  | -
Exercised |  | (198) |  |  | 27.76 |  | (416) |  |  | 27.49 |  | (598) |  |  | 25.04
Forfeited |  | - |  |  | - |  | - |  |  | - |  | - |  |  | -
Outstanding at end of year |  | 155 |  | $ | 29.65 |  | 353 |  | $ | 28.59 |  | 769 |  | $ | 28.00
Options exercisable at end of year |  | 155 |  | $ | 29.65 |  | 353 |  | $ | 28.59 |  | 769 |  | $ | 28.00
Intrinsic values |
|  | As of
|  | December 30, |  | December 31, |  | December 26,
|  | 2017 |  | 2016 |  | 2015
Stock options outstanding |  | $ | 6,256 |  | $ | 16,681 |  | $ | 38,882
Stock options exercisable |  |  | 6,256 |  |  | 16,681 |  |  | 38,882
Status of non-vested restricted shares/units |
|  | Time-Based Restricted Stock/Units
|  |  |  | Weighted Average |  |  |
|  |  |  | Grant Date Fair |  |  | Intrinsic Value
|  | Shares/Units |  | Value Per Share |  |  | Per Share
Outstanding at beginning of period |  | 1,339 |  | $ | 60.54 |  |  |  |
Granted |  | 297 |  |  | 85.29 |  |  |  |
Vested |  | (376) |  |  | 47.19 |  |  |  |
Forfeited |  | (27) |  |  | 74.47 |  |  |  |
Outstanding at end of period |  | 1,233 |  | $ | 70.28 |  |  | $ | 69.88
|  | Performance-Based Restricted Stock/Units
|  |  |  | Weighted Average |  |  |
|  |  |  | Grant Date Fair |  |  | Intrinsic Value
|  | Shares/Units |  | Value Per Share |  |  | Per Share
Outstanding at beginning of period |  | 1,849 |  | $ | 54.05 |  |  |  |
Granted |  | 251 |  |  | 82.30 |  |  |  |
Vested |  | (852) |  |  | 54.91 |  |  |  |
Forfeited |  | (22) |  |  | 78.89 |  |  |  |
Outstanding at end of period |  | 1,226 |  | $ | 60.81 |  |  | $ | 69.88

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- Definition Disclosure regarding the total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options under the plan as of the balance-sheet date. + References No definition available. + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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=96867065&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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