Stock-Based Employee Compensation - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 25, 2019	Dec. 25, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock issuable upon exercise of outstanding options (in shares)	467,000	467,000
Unvested restricted stock outstanding (in shares)	1,604,000	1,313,000
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost	$ 8.6
Cost expected to be recognized, period	1 year 11 months 5 days
2012 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock authorized for issuance (in shares)	2,232,800
Shares of common stock available for future grants (in shares)	0
2019 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock authorized for issuance (in shares)	1,950,000
Shares of common stock issuable upon exercise of outstanding options (in shares)	467,300
Unvested restricted stock outstanding (in shares)	1,603,701
Shares of common stock available for future grants (in shares)	2,098,208
Minimum \| 2012 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants under the company's equity incentive plan, vesting period	1 year
Minimum \| 2019 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants under the company's equity incentive plan, vesting period	1 year
Maximum \| 2012 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants under the company's equity incentive plan, vesting period	4 years
Maximum \| 2019 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants under the company's equity incentive plan, vesting period	4 years

Aggregate number of common shares reserved for future issuance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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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.

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Number of options outstanding, including both vested and non-vested options.

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