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SCHEDULE I: CONDENSED FINANCIAL INFORMATION OF REGISTRANT - NOTES TO FINANCIAL STATEMENTS (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 26, 2018 | Dec. 27, 2017 | Dec. 28, 2016
Class of Stock [Line Items] |  |  |
Percentage of tax benefits due to equity owners | 85.00% |  |
Payments under tax receivable agreement | $ 0 | $ (4,844,000) | $ 0
Cash paid for: |  |  |
Income taxes | 3,272,000 | 2,261,000 | 1,823,000
Interest | 2,261,000 | 1,106,000 | 54,000
Non-cash financing activities: |  |  |
Establishment of Liabilities Under Tax Receivable Agreement |  | 18,973,000 | 100,063,000
Establishment of liabilities under tax receivable agreement | $ 203,725,000 |  |
IPO |  |  |
Class of Stock [Line Items] |  |  |
Percentage of tax benefits due to equity owners | 85.00% |  |
Class A Common Stock | Secondary Offering and Redemption of Units |  |  |
Non-cash investing activities: |  |  |
Class A common stock issued | $ 2,000 | 1,000 | 5,000
Class B Common Stock | Secondary Offering and Redemption of Units |  |  |
Non-cash financing activities: |  |  |
Cancellation of Class B common stock | (2,000) | (1,000) | (5,000)
Parent Company |  |  |
Class of Stock [Line Items] |  |  |
Due to SSE Holdings | 3,534,000 | 4,217,000 |
Intercompany revenue | 2,055,000 | 1,466,000 | 1,603,000
Equity in net income of subsidiaries | $ 21,537,000 | 22,090,000 | 16,982,000
Percentage of tax benefits due to equity owners | 85.00% |  |
Payments under tax receivable agreement | $ 0 | (4,844,000) | 0
Non-cash investing activities: |  |  |
Accrued contribution related to stock option exercises | 5,472,000 | 7,586,000 | 1,116,000
Non-cash contribution made in connection with equity awards granted to employees of SSE Holdings | 5,999,000 | 5,497,000 | 5,304,000
Non-cash financing activities: |  |  |
Establishment of liabilities under tax receivable agreement | 203,725,000 | 159,373,000 |
Parent Company | Class A Common Stock | Secondary Offering and Redemption of Units |  |  |
Non-cash investing activities: |  |  |
Class A common stock issued | 15,202,000 | 4,415,000 | 18,944,000
Parent Company | Class B Common Stock | Secondary Offering and Redemption of Units |  |  |
Non-cash financing activities: |  |  |
Cancellation of Class B common stock | 2,000 | 1,000 | 5,000
Consolidation, Eliminations | Parent Company |  |  |
Class of Stock [Line Items] |  |  |
Intercompany revenue | 2,055,000 |  |
Equity in net income of subsidiaries | 21,537,000 |  |
Cash paid for: |  |  |
Income taxes | 185,000 | 253,000 | 576,000
Interest | 0 | 2,000 | 0
Non-cash financing activities: |  |  |
Establishment of Liabilities Under Tax Receivable Agreement | $ 44,338,000 |  |
Establishment of liabilities under tax receivable agreement |  | $ 18,973,000 | $ 100,063,000

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