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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