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SCHEDULE I: CONDENSED FINANCIAL INFORMATION OF REGISTRANT - NOTES TO FINANCIAL STATEMENTS (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 04, 2015 | Dec. 30, 2015 | Dec. 30, 2015 | Dec. 28, 2016 | Dec. 30, 2015 | Dec. 31, 2014
Class of Stock [Line Items] |  |  |  |  |  |
Income taxes, net of refunds |  |  |  | $ 1,823 | $ 416 | $ 836
Accrued contribution related to stock option exercises |  |  |  | 1,116 | 0 | 0
Non-cash Contribution Made In Connection With Equity Awards Granted To Employees Of SSE Holdings |  |  |  | 5,304 | 2,355 | 0
Tax receivable agreement liability |  |  |  | $ 272,482 |  |
Percentage of tax benefits due to equity owners |  |  |  | 85.00% |  |
IPO |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Percentage of tax benefits due to equity owners |  |  |  | 85.00% |  |
Class A Common Stock | IPO And Organizational Transaction |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Class A common stock issued |  |  |  | $ 0 | 6 | 0
Class A Common Stock | USC Merger |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Class A common stock issued |  |  |  | 0 | 2 | 0
Class A Common Stock | Secondary Offering and Redemption of Units |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Class A common stock issued |  |  |  | 5 | 6 | 0
Class A Common Stock | Common stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares issued during the period | 5,968,841 |  | 5,750,000 |  |  |
Class A Common Stock | Common stock | IPO |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares issued during the period | 5,750,000 |  |  |  |  |
Shares issued, share price (in dollars per share) | $ 21 |  |  |  |  |
Proceeds of issuance of initial public offering net of underwriting discounts and commissions | $ 112,298 |  |  |  |  |
Class A Common Stock | Common stock | Over-allotment option |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares issued during the period | 750,000 |  |  |  |  |
Class A Common Stock | Common stock | USC Merger |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares issued during the period |  | 1,727,804 |  |  |  |
Class B Common Stock | IPO And Organizational Transaction |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Cancellation of Class B common stock |  |  |  |  | (6) | 0
Class B Common Stock | USC Merger |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Cancellation of Class B common stock |  |  |  | 0 | (2) | 0
Class B Common Stock | Secondary Offering and Redemption of Units |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Cancellation of Class B common stock |  |  |  | (5) | (6) | 0
Class B Common Stock | Common stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares issued during the period | 30,160,694 |  |  |  |  |
Parent Company |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Accounts Payable, Related Parties |  | $ 0 | $ 0 | 1,655 | 0 |
Due from SSE Holdings |  | 3,979 | 3,979 | 0 | 3,979 |
Intercompany revenue |  |  |  | 1,603 |  | 0
Equity in net income of subsidiaries |  |  |  | 16,982 | 6,906 | 0
Tax receivable agreement liability |  | 173,090 | 173,090 | $ 272,482 | 173,090 |
Percentage of tax benefits due to equity owners |  |  |  | 85.00% |  |
Parent Company | Class A Common Stock | IPO And Organizational Transaction |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Class A common stock issued |  |  |  | $ 0 | 6 | 0
Parent Company | Class A Common Stock | USC Merger |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Class A common stock issued |  |  |  | 0 | 2 | 0
Parent Company | Class A Common Stock | Secondary Offering and Redemption of Units |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Class A common stock issued |  |  |  | 18,944 | 19,933 | 0
Parent Company | Class A Common Stock | Common stock | IPO |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares issued during the period | 5,750,000 |  |  |  |  |
Shares issued, share price (in dollars per share) | $ 21.000 |  |  |  |  |
Proceeds of issuance of initial public offering net of underwriting discounts and commissions | $ 112,298 |  |  |  |  |
Parent Company | Class A Common Stock | Common stock | Over-allotment option |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares issued during the period | 750,000 |  |  |  |  |
Parent Company | Class B Common Stock | IPO And Organizational Transaction |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Cancellation of Class B common stock |  |  |  | 0 | (6) | 0
Parent Company | Class B Common Stock | USC Merger |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Cancellation of Class B common stock |  |  |  | 0 | (2) | 0
Parent Company | Class B Common Stock | Secondary Offering and Redemption of Units |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Cancellation of Class B common stock |  |  |  |  | (6) | 0
Consolidation, Eliminations | Parent Company |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Income taxes, net of refunds |  |  |  | 576 | 0 | 0
Intercompany revenue |  |  |  | 1,603 | 1,336 |
Equity in net income of subsidiaries |  |  |  | 16,982 |  |
Tax receivable agreement liability |  | $ 173,090 | $ 173,090 | $ 100,063 | $ 173,090 | $ 0

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