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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