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Share-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 27, 2018 | Jun. 28, 2017 | Jun. 27, 2018 | Jun. 28, 2017
Total share-based compensation [Abstract] |  |  |  |
Total share-based compensation | $ 1,211 | $ 2,080 | $ 2,561 | $ 4,053
Performance share units [Member] |  |  |  |
Total share-based compensation [Abstract] |  |  |  |
Total share-based compensation | $ 942 | 1,904 | $ 2,020 | 3,844
Restricted Stock Units [Abstract] |  |  |  |
Performance period, equity award |  |  | 3 years |
Common stock shares issued (in shares) |  |  | 0.2 |
Common stock shares deferred (in shares) | 0.3 |  | 0.3 |
Shares paid for tax withholding (in shares) |  |  | 0.1 |
Unrecognized compensation cost [Abstract] |  |  |  |
Unrecognized compensation cost related to unvested share awards outstanding | $ 11,700 |  | $ 11,700 |
Unrecognized compensation cost, expected weighted average period |  |  | 2 years 11 days |
Performance share units [Member] | Minimum [Member] |  |  |  |
Restricted Stock Units [Abstract] |  |  |  |
Percentage of target awards to be earned (in hundredths) |  |  | 0.00% |
Performance share units [Member] | Maximum [Member] |  |  |  |
Restricted Stock Units [Abstract] |  |  |  |
Percentage of target awards to be earned (in hundredths) |  |  | 150.00% |
Performance share units [Member] | Performance share units that vest based on TSR [Member] |  |  |  |
Restricted Stock Units [Abstract] |  |  |  |
Equity awards granted (in shares) |  |  | 0.2 |
Equity awards, grant date fair value (in dollars per share) |  |  | $ 18.17 |
Performance share units [Member] | Performance share units that vest based on Adjusted EPS growth [Member] |  |  |  |
Restricted Stock Units [Abstract] |  |  |  |
Equity awards granted (in shares) |  |  | 0.3 |
Equity awards, grant date fair value (in dollars per share) |  |  | $ 15.93 |
Restricted stock units for board members [Member] |  |  |  |
Total share-based compensation [Abstract] |  |  |  |
Total share-based compensation | 269 | $ 176 | $ 541 | $ 209
Restricted Stock Units [Abstract] |  |  |  |
Equity awards granted (in shares) |  |  | 0.1 |
Equity awards, grant date fair value (in dollars per share) |  |  | $ 15.49 |
Performance period, equity award |  |  | 1 year |
Unrecognized compensation cost [Abstract] |  |  |  |
Unrecognized compensation cost related to unvested share awards outstanding | $ 800 |  | $ 800 |
Unrecognized compensation cost, expected weighted average period |  |  | 9 months 28 days |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of common shares reserved for future issuance related to deferred compensation arrangements with individuals. + References No definition available. + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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