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Employee Benefit Programs (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2017 | Dec. 30, 2018 | Dec. 31, 2017 | Dec. 25, 2016
Employee Stock Purchase Plan |  |  |  |
Compensation expense |  | $ 4.0 | $ 4.8 | $ 4.5
Employee Defined Contribution Plan |  |  |  |
Minimum age of employees to be eligible to participate in defined contribution plan |  | 21 years |  |
Percentage of matching contribution |  | 50.00% |  | 25.00%
Percentage of maximum compensation matched by employer |  | 4.00% |  | 4.00%
Matching contribution expense |  | $ 0.9 | 0.7 | $ 0.6
Employee Deferred Compensation Plan | Deferred compensation, excluding share-based payments and retirement benefits |  |  |  |
Employee Deferred Compensation Plan |  |  |  |
Deferred payment, participant limit per calendar year as a percentage of base salary |  | 75.00% |  |
Deferred payment, participant limit per calendar year as a percentage of variable compensation and commissions |  | 100.00% |  |
Deferred payment, maximum employer match |  | 50.00% |  | 25.00%
Deferred payment, maximum matching contribution percentage |  | 4.00% |  | 4.00%
Deferred compensation expense |  |  | 1.0 | $ 0.0
Employee Deferred Compensation Plan | Deferred compensation, excluding share-based payments and retirement benefits | Other assets, net |  |  |  |
Employee Deferred Compensation Plan |  |  |  |
Deferred compensation assets |  | $ 8.2 | 9.3 |
Employee Deferred Compensation Plan | Deferred compensation, excluding share-based payments and retirement benefits | Other non-current liability |  |  |  |
Employee Deferred Compensation Plan |  |  |  |
Liability for participant contributions and investment income |  | $ 8.2 | $ 9.3 |
Amended And Restated Employee Stock Purchase Plan |  |  |  |
Employee Stock Purchase Plan |  |  |  |
Number of shares outstanding | 100,000 |  |  |
Maximum percentage of base compensation that can be contributed by the eligible team members | 15.00% |  |  |
Estimated subscription date fair value (as a percent) | 85.00% |  |  |
Requisite employment period to be eligible to participate in the plan | 1 year |  |  |
Requisite working hours per week to be eligible to participate in the plan | 20 hours |  |  |
Operational period of the plan | 6 months |  |  |
Number of shares issued under the plan |  | 10,360 | 7,607 |
Number of shares available for future issuance under the plan |  | 82,033 |  |
Risk-free interest rate (as a percent) |  | 2.05% | 1.05% |
Expected life |  | 6 months | 6 months |
Expected volatility (as a percent) |  | 39.92% | 37.96% |
Dividend yield (as a percent) |  | 0.00% | 0.00% |
Weighted average fair value per share at grant date (in dollars per share) |  | $ 5.19 | $ 11.16 |
Compensation expense |  | $ 0.1 | $ 0.2 | $ 0.2
Employee Stock Purchase Plan |  |  |  |
Employee Stock Purchase Plan |  |  |  |
Number of shares issued under the plan |  |  | 17,294 |

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- Definition The limit of annual amount that can be deferred by an employee to the plan per calendar year as a percentage of base salary. + References No definition available. + Details
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- Definition The limit of annual amount that can be deferred by an employee to the plan per calendar year as a percentage of variable compensation and commissions. + References No definition available. + Details
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- Definition Deferred Compensation Assets + References No definition available. + Details
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- Definition Represents the minimum age of employees to be eligible to participate in the defined contribution plan. + References No definition available. + Details
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- Definition The employer matching contribution as a percentage of the employee contributions under the defined contribution plan. + References No definition available. + Details
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- Definition Maximum percentage of employees' compensation that is deferred by plan participants for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Represents the minimum working hours per week required to be eligible to participate in the employee stock purchase plan. + References No definition available. + Details
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- Definition Represents the operational period for employee stock purchase plan. + References No definition available. + Details
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- Definition Represents the minimum employment period required to be eligible to participate in the employee stock purchase plan. + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + 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=109197908&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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)(iv) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 (f)(2)(i) -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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 + Details
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