CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	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 (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)	Non- Controlling Interest
Beginning balance (shares) at Dec. 29, 2021				39,142,397	2,921,587
Beginning balance at Dec. 29, 2021	$ 435,600			$ 39	$ 3	$ 405,940	$ 3,554	$ 1	$ 26,063
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) (including amounts attributable to non-controlling interests)	(14,896)						(13,374)		(1,522)
Other comprehensive income (loss):
Change in foreign currency translation adjustment	(2)							(2)
Equity-based compensation	10,295					10,295
Activity under stock compensation plans (in shares)				85,228
Activity under stock compensation plans	(1,872)					(2,790)			918
Redemption of LLC Interests (in shares)				52,074	(52,074)
Redemption of LLC Interests	0					313			(313)
Establishment of liabilities under tax receivable agreement and related changes to deferred tax assets associated with increases in tax basis	(484)					(484)
Distributions paid to non-controlling interest holders	(389)								(389)
Ending balance (shares) at Sep. 28, 2022				39,279,699	2,869,513
Ending balance at Sep. 28, 2022	428,252			$ 39	$ 3	413,274	(9,820)	(1)	24,757
Beginning balance (shares) at Jun. 29, 2022				39,266,670	2,871,513
Beginning balance at Jun. 29, 2022	427,636			$ 39	$ 3	410,520	(7,796)	(1)	24,871
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) (including amounts attributable to non-controlling interests)	(2,311)						(2,024)		(287)
Other comprehensive income (loss):
Change in foreign currency translation adjustment	0							0
Equity-based compensation	3,570					3,570
Activity under stock compensation plans (in shares)				11,029
Activity under stock compensation plans	63					(182)			245
Redemption of LLC Interests (in shares)				2,000	(2,000)
Redemption of LLC Interests	0					7			(7)
Establishment of liabilities under tax receivable agreement and related changes to deferred tax assets associated with increases in tax basis	(641)					(641)
Distributions paid to non-controlling interest holders	(65)								(65)
Ending balance (shares) at Sep. 28, 2022				39,279,699	2,869,513
Ending balance at Sep. 28, 2022	428,252			$ 39	$ 3	413,274	(9,820)	(1)	24,757
Beginning balance (shares) at Dec. 28, 2022		39,284,998	2,869,513	39,284,998	2,869,513
Beginning balance at Dec. 28, 2022	419,748			$ 39	$ 3	415,611	(20,537)	0	24,632
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) (including amounts attributable to non-controlling interests)	13,737						13,041		696
Other comprehensive income (loss):
Change in foreign currency translation adjustment	(3)							(3)
Equity-based compensation	11,438					11,438
Activity under stock compensation plans (in shares)				146,270
Activity under stock compensation plans	(2,311)					(3,023)			712
Redemption of LLC Interests (in shares)				35,000	(35,000)
Redemption of LLC Interests	0					265			(265)
Establishment of liabilities under tax receivable agreement and related changes to deferred tax assets associated with increases in tax basis	(480)					(480)
Distributions paid to non-controlling interest holders	(131)								(131)
Ending balance (shares) at Sep. 27, 2023		39,466,268	2,834,513	39,466,268	2,834,513
Ending balance at Sep. 27, 2023	441,998			$ 39	$ 3	423,811	(7,496)	(3)	25,644
Beginning balance (shares) at Jun. 28, 2023				39,449,246	2,844,513
Beginning balance at Jun. 28, 2023	431,359			$ 39	$ 3	421,356	(15,123)	(4)	25,088
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) (including amounts attributable to non-controlling interests)	8,136						7,627		509
Other comprehensive income (loss):
Change in foreign currency translation adjustment	1							1
Equity-based compensation	3,563					3,563
Activity under stock compensation plans (in shares)				7,022
Activity under stock compensation plans	(272)					(469)			197
Redemption of LLC Interests (in shares)				10,000	(10,000)
Redemption of LLC Interests	0					71			(71)
Establishment of liabilities under tax receivable agreement and related changes to deferred tax assets associated with increases in tax basis	(710)					(710)
Distributions paid to non-controlling interest holders	(79)								(79)
Ending balance (shares) at Sep. 27, 2023		39,466,268	2,834,513	39,466,268	2,834,513
Ending balance at Sep. 27, 2023	$ 441,998			$ 39	$ 3	$ 423,811	$ (7,496)	$ (3)	$ 25,644