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Stockholders' Equity - Stock Option Plans and Restricted Stock Units Plans (Details) - USD ($) $ in Millions |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 01, 2014 | Dec. 31, 2017 | Dec. 25, 2016 | Dec. 27, 2015 | May 31, 2017 | Mar. 28, 2014 | Mar. 27, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock awards granted | 0 | 7,000 |  |  |  |  |
Number of shares available for issuance (in shares) |  |  |  |  |  | 1,550,000 | 2,306,256
Total number of awards outstanding (shares) |  |  |  |  |  |  | 5,511,322
Total unrecognized stock-based compensation expense related to nonvested options |  | $ 0.1 |  |  |  |  |
Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based incentive award vesting period |  | 10 years |  |  |  |  |
Stock Options and Restricted Stock Units | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based incentive award vesting period |  | 10 years |  |  |  |  |
Stock options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized stock-based compensation expense, period for recognition |  | 6 months |  |  |  |  |
Stock options | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based incentive award vesting period |  | 6 years |  |  |  |  |
Award term or expiration period |  | 10 years |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized stock-based compensation expense, period for recognition |  | 3 years 1 month 6 days |  |  |  |  |
Total unrecognized stock-based compensation expense related to nonvested restricted stock units |  | $ 7.2 |  |  |  |  |
Fair value of vested awards |  | $ 6.3 | $ 4.7 | $ 3.6 |  |  |
2014 Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares available for issuance (in shares) |  | 3,954,912 |  |  | 2,500,000 |  |
Total number of awards outstanding (shares) |  |  |  |  |  |  | 5,511,322

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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 The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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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