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Share-Based Compensation (Narrative) (Details) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 25, 2019 USD ($) plan $ / shares shares | Dec. 26, 2018 USD ($) $ / shares shares | Dec. 27, 2017 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of share-based compensation plans | plan | 4 |  |
Shares available for grant (in shares) | 700 |  |
Income tax benefits recognized related to share-based compensation | $ | $ 1.7 | $ 1.6 | $ 3.3
Performance share awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average grant date fair value (US$ per share) | $ / shares | $ 19.02 | $ 16.97 | $ 12.59
Performance period | 3 years |  |
Cash payments | $ | $ 0.4 | $ 0.2 | $ 3.9
Intrinsic value of units converted | $ | 16.9 | 9.8 | $ 5.0
Accrued compensation included as a component of other current liabilities | $ | 0.1 | 0.4 |
Accrued compensation included as a component of other noncurrent liabilities | $ | 0.2 | $ 0.2 |
Unrecognized compensation cost related to unvested awards outstanding | $ | $ 8.8 |  |
Unrecognized compensation cost, expected weighted average period | 1 year 8 months 12 days |  |
Stock units outstanding (in shares) | 1,681 | 1,688 |
Restricted stock units for board members |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity awards granted (in shares) | 100 |  |
Weighted average grant date fair value (US$ per share) | $ / shares | $ 19.44 |  |
Performance period | 1 year |  |
Unrecognized compensation cost related to unvested awards outstanding | $ | $ 0.3 |  |
Unrecognized compensation cost, expected weighted average period | 4 months 24 days |  |
Stock units converted into common stock | 100 |  |
Stock units outstanding (in shares) | 700 | 800 |
Minimum | Performance share awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of target award to be earned | 0.00% |  |
Maximum | Performance share awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of target award to be earned | 150.00% |  |
Performance shares that vest based on TSR | Performance share awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity awards granted (in shares) | 300 |  |
Weighted average grant date fair value (US$ per share) | $ / shares | $ 20.47 |  |
Performance shares that vest based on EBITDA growth | Performance share awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity awards granted (in shares) | 300 |  |
Weighted average grant date fair value (US$ per share) | $ / shares | $ 17.58 |  |
2017 Omnibus Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares available for grant (in shares) | 2,600 |  |

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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable within one year (or the operating cycle, if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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