CONSOLIDATED STATEMENTS OF STOCKHOLDERS' AND MEMBERS' EQUITY - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Class A Common Stock	Class B Common Stock	Common stock Class A Common Stock	Common stock Class B Common Stock	Additional Paid-In Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjustment	Non- Controlling Interest	Non- Controlling Interest Cumulative Effect, Period of Adoption, Adjustment	Secondary Offering and Redemption of Units	Secondary Offering and Redemption of Units Common stock Class A Common Stock	Secondary Offering and Redemption of Units Common stock Class B Common Stock	Secondary Offering and Redemption of Units Additional Paid-In Capital
Beginning balance at Dec. 26, 2018	$ 273,455				$ 30	$ 8	$ 195,633	$ 30,404		$ 0		$ 47,380
Beginning balance (in shares) at Dec. 26, 2018					29,520,833	7,557,347
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	24,128							19,827				4,301
Other comprehensive loss:
Net unrealized losses related to available-for-sale securities	2
Net change in foreign currency translation adjustment	2									2
Equity-based compensation	7,700						7,700
Equity-based compensation	7,805				$ 0		4,517					3,288
Activity under stock compensation (in shares)					484,319
Redemptions	0											(11,934)		$ 0	$ (2)	$ (2)	$ (11,934)
Redemptions (in shares)					(1,721,887)										(1,721,887)	(1,721,887)
Effect of GTC Merger					$ (3)	$ (3)	(19,218)					(19,218)
Effect of GTC Merger (in shares)					(2,690,263)	(2,690,263)
Establishment of liabilities under tax receivable agreement and related changes to deferred tax assets associated with increases in tax basis	5,408						5,408
Establishment of liabilities under tax receivable agreement and related changes to deferred tax assets associated with increases in tax basis	(1,708)											(1,708)
Ending balance at Dec. 25, 2019	321,985	$ 5,195			$ 35	$ 3	244,410	54,367	$ 4,136	2		23,168	$ 1,059
Ending balance (in shares) at Dec. 25, 2019					34,417,302	3,145,197
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	(45,534)							(42,158)				(3,376)
Other comprehensive loss:
Net unrealized losses related to available-for-sale securities	1
Net change in foreign currency translation adjustment	1									1
Equity-based compensation	5,600						5,600
Equity-based compensation	6,215				$ 1		5,909					305
Activity under stock compensation (in shares)					456,942
Redemptions												(1,723)		0	$ 0	$ 0	(1,723)
Redemptions (in shares)					(194,009)										(194,009)	(194,009)
Establishment of liabilities under tax receivable agreement and related changes to deferred tax assets associated with increases in tax basis	1,707						1,707
Establishment of liabilities under tax receivable agreement and related changes to deferred tax assets associated with increases in tax basis	(478)											(478)
Equity offering (in shares)					3,649,537
Issuance of Class A common stock sold in equity offerings, net of underwriting discounts, commissions and offering costs	144,997				$ 3		135,718					9,276
Ending balance at Dec. 30, 2020	434,493				$ 39	$ 3	395,067	12,209		3		27,172
Ending balance (in shares) at Dec. 30, 2020			38,717,790	2,951,188	38,717,790	2,951,188
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	(10,111)							(8,655)				(1,456)
Other comprehensive loss:
Net unrealized losses related to available-for-sale securities	(2)
Net change in foreign currency translation adjustment	(2)									(2)
Equity-based compensation	8,803						8,803
Equity-based compensation	3,177				$ 0		1,829					1,348
Activity under stock compensation (in shares)					395,006
Redemptions												(33)		$ 0	$ 0	$ 0	$ (33)
Redemptions (in shares)					(29,601)										(29,601)	(29,601)
Establishment of liabilities under tax receivable agreement and related changes to deferred tax assets associated with increases in tax basis	208						208
Establishment of liabilities under tax receivable agreement and related changes to deferred tax assets associated with increases in tax basis	(968)											(968)
Ending balance at Dec. 29, 2021	$ 435,600				$ 39	$ 3	$ 405,940	$ 3,554		$ 1		$ 26,063
Ending balance (in shares) at Dec. 29, 2021			39,142,397	2,921,587	39,142,397	2,921,587