SCHEDULE I: CONDENSED FINANCIAL INFORMATION OF REGISTRANT - NOTES TO FINANCIAL STATEMENTS (Details) - USD ($)	12 Months Ended
	Dec. 30, 2020	Dec. 25, 2019	Dec. 26, 2018
Class of Stock [Line Items]
Percentage of tax benefits due to equity owners	85.00%
Payments under tax receivable agreement	$ (6,643,000)	$ (707,000)	$ 0
Cash paid for:
Income taxes	1,612,000	3,044,000	3,272,000
Non-cash financing activities:
Establishment of Liabilities Under Tax Receivable Agreement	$ 4,024,000	32,065,000	44,338,000
IPO
Class of Stock [Line Items]
Percentage of tax benefits due to equity owners	85.00%
Class A Common Stock | Gramercy Tavern
Non-cash investing activities:
Class A common stock issued	$ 0	3,000	0
Class B Common Stock | Gramercy Tavern
Non-cash financing activities:
Cancellation of Class B common stock	0	(3,000)	0
Parent Company
Class of Stock [Line Items]
Due from SSE Holdings	2,103,000	7,124,000
Due to SSE Holdings	13,288,000	9,652,000
Intercompany revenue	1,560,000	2,018,000	2,055,000
Equity in net income (loss) of subsidiaries	$ (41,152,000)	19,831,000	21,537,000
Percentage of tax benefits due to equity owners	85.00%
Payments under tax receivable agreement	$ (6,643,000)	(707,000)	0
Non-cash investing activities:
Accrued contribution related to stock option exercises	8,094,000	9,227,000	5,472,000
Non-cash contribution made in connection with equity awards granted to employees of SSE Holdings	5,193,000	4,402,000	5,999,000
Parent Company | Class A Common Stock | Secondary Offering and Redemption of Units
Non-cash investing activities:
Class A common stock issued	1,723,000	11,934,000	15,202,000
Parent Company | Class A Common Stock | Gramercy Tavern
Non-cash investing activities:
Class A common stock issued	0	19,218,000	0
Parent Company | Class B Common Stock | USC Merger
Non-cash financing activities:
Cancellation of Class B common stock	0	(3,000)	0
Parent Company | Class B Common Stock | Secondary Offering and Redemption of Units
Non-cash financing activities:
Cancellation of Class B common stock		(2,000)	(2,000)
Consolidation, Eliminations | Parent Company
Class of Stock [Line Items]
Intercompany revenue	1,560,000
Equity in net income (loss) of subsidiaries	(41,152,000)
Cash paid for:
Income taxes	124,000	233,000	185,000
Non-cash financing activities:
Establishment of Liabilities Under Tax Receivable Agreement	$ 4,024,000	$ 32,065,000	$ 44,338,000