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SCHEDULE I: CONDENSED FINANCIAL INFORMATION OF REGISTRANT - NOTES TO CONDENSED FINANCIAL STATEMENTS (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 27, 2023
Jun. 28, 2023
Mar. 29, 2023
Sep. 28, 2022
Jun. 29, 2022
Mar. 30, 2022
Dec. 27, 2023
Dec. 28, 2022
Dec. 29, 2021
Mar. 31, 2021
Dec. 26, 2020
Condensed Financial Statements, Captions [Line Items]                      
Deferred income taxes, net $ 319,244,000 $ 319,113,000 $ 318,626,000 $ 321,181,000 $ 319,435,000 $ 318,371,000 $ 326,208,000 $ 317,626,000 $ 312,873,000    
Other current liabilities 17,522,000 17,881,000 18,117,000 19,497,000 20,261,000 20,586,000 17,103,000 19,552,000      
Liabilities under tax receivable agreement, net of current portion 235,614,000 235,361,000 235,361,000 234,892,000 234,862,000 234,273,000 235,613,000 234,893,000      
Other income, net 3,441,000 3,227,000 2,837,000 1,482,000 538,000 (289,000) 12,776,000 4,127,000 95,000    
Income tax benefit 529,000 347,000 867,000 (1,508,000) 707,000 (4,297,000) (4,010,000) (1,180,000) (11,318,000)    
Net income (loss)             20,264,000 (21,229,000) (4,561,000)    
Additional paid-in capital 423,849,000 421,394,000 417,489,000 413,291,000 410,537,000 406,998,000 426,601,000 415,649,000 405,957,000    
Retained earnings (accumulated deficit) 9,554,000 1,927,000 (5,021,000) 4,368,000 6,392,000 7,580,000 16,777,000 (3,487,000) 17,742,000    
Net income (loss) 8,136,000 7,223,000 (1,622,000) (2,311,000) (1,303,000) (11,282,000) 20,990,000 (23,105,000) (6,017,000)    
Deferred income taxes             (9,074,000) (5,014,000) (14,473,000)    
Accrued expenses             9,513,000 3,502,000 7,175,000    
Net cash provided by Operating activities             $ 132,139,000 76,742,000 58,404,000    
Percentage of tax benefits due to equity owners             85.00%        
Income taxes, net of refunds             $ 4,056,000 3,731,000 2,808,000    
Establishment of liabilities under tax receivable agreement             720,000 844,000 1,093,000    
Private Placement | 0% Convertible Senior Notes Due 2028 | Senior Notes                      
Condensed Financial Statements, Captions [Line Items]                      
Aggregate principal amount                   $ 250,000,000  
Interest rate (in percent)                   0.00%  
Impact of Adjustment                      
Condensed Financial Statements, Captions [Line Items]                      
Deferred income taxes, net 17,088,000 17,088,000 17,088,000 14,205,000 14,205,000 14,205,000   17,088,000 14,205,000    
Other current liabilities 0 0 0 0 0 0          
Liabilities under tax receivable agreement, net of current portion 0 0 0 0 0 0          
Income tax benefit               (2,862,000) (4,094,000)    
Income tax expense               2,862,000      
Retained earnings and deferred tax assets                     $ 10,094,000
Additional paid-in capital 38,000 38,000 38,000 17,000 17,000 17,000   38,000 17,000    
Retained earnings (accumulated deficit) 17,050,000 17,050,000 17,050,000 14,188,000 14,188,000 14,188,000   17,050,000 14,188,000    
Net income (loss)               2,862,000 4,094,000    
Deferred income taxes               (1,657,000) (4,094,000)    
Accrued expenses               (1,205,000) 0    
Net cash provided by Operating activities               0 0    
As previously reported                      
Condensed Financial Statements, Captions [Line Items]                      
Deferred income taxes, net 302,156,000 302,025,000 301,538,000 306,976,000 305,230,000 304,166,000   300,538,000 298,668,000    
Other current liabilities 17,522,000 17,881,000 18,117,000 19,497,000 20,261,000 20,586,000          
Liabilities under tax receivable agreement, net of current portion 235,614,000 235,361,000 235,361,000 234,892,000 234,862,000 234,273,000          
Income tax benefit               1,682,000 (7,224,000)    
Additional paid-in capital 423,811,000 421,356,000 417,451,000 413,274,000 410,520,000 406,981,000   415,611,000 405,940,000    
Retained earnings (accumulated deficit) $ (7,496,000) $ (15,123,000) $ (22,071,000) $ (9,820,000) $ (7,796,000) (6,608,000)   (20,537,000) 3,554,000    
Net income (loss)               (25,967,000) (10,111,000)    
Deferred income taxes               (3,357,000) (10,379,000)    
Accrued expenses               4,707,000 7,175,000    
Net cash provided by Operating activities               76,742,000 58,404,000    
Parent Company                      
Condensed Financial Statements, Captions [Line Items]                      
Deferred income taxes, net             328,870,000 324,113,000      
Liabilities under tax receivable agreement, net of current portion             235,613,000 234,893,000      
Intercompany revenue             7,971,000 2,293,000 2,878,000    
Equity in net income (loss) from SSE Holdings             10,091,000 (25,335,000) (19,393,000)    
Other income, net             14,533,000 (1,767,000) (25,593,000)    
Income tax benefit             (5,203,000) (5,783,000) (21,677,000)    
Additional paid-in capital             426,601,000 415,649,000      
Retained earnings (accumulated deficit)             5,277,000 (24,758,000)      
Net income (loss)             30,034,000 (23,272,000) (23,789,000)    
Deferred income taxes             (5,249,000) (5,783,000) (21,677,000)    
Accrued expenses             512,000 (104,000) 118,000    
Net cash provided by Operating activities             $ (1,224,000) (1,093,000) (7,213,000)    
Percentage of tax benefits due to equity owners             85.00%        
Accrued contribution related to stock option exercises             $ 744,000 424,000 6,731,000    
Non-cash contribution made in connection with equity awards granted to employees of SSE Holdings             10,305,000 6,988,000 11,468,000    
Parent Company | Class A Common Stock | Secondary Offering and Redemption of Units                      
Condensed Financial Statements, Captions [Line Items]                      
Class A common stock issued in connection with the acquisition of LLC Interests upon redemption by the non-controlling interest holders             265,000 313,000 33,000    
Parent Company | Related Party                      
Condensed Financial Statements, Captions [Line Items]                      
Notes receivable             8,213,000 2,963,000      
Other current liabilities             22,027,000 16,975,000      
Parent Company | Affiliated Entity                      
Condensed Financial Statements, Captions [Line Items]                      
Notes receivable             216,946,000 209,013,000      
Parent Company | Affiliated Entity | Conversion Option                      
Condensed Financial Statements, Captions [Line Items]                      
Notes receivable             12,900,000 6,300,000      
Parent Company | Consolidation, Eliminations                      
Condensed Financial Statements, Captions [Line Items]                      
Deferred income taxes, net             4,289,000 8,004,000      
Intercompany revenue             7,971,000 2,293,000 2,878,000    
Equity in net income (loss) from SSE Holdings             10,091,000 (25,335,000) (19,393,000)    
Other income, net             14,533,000 (1,767,000) (25,593,000)    
Income tax benefit             3,715,000 (769,000) (7,234,000)    
Income taxes, net of refunds             9,000 0 19,000    
Establishment of liabilities under tax receivable agreement             720,000 844,000 1,093,000    
Parent Company | Consolidation, Eliminations | Related Party                      
Condensed Financial Statements, Captions [Line Items]                      
Notes receivable             8,213,000 2,963,000      
Other current liabilities             22,027,000 16,975,000      
Parent Company | Consolidation, Eliminations | Affiliated Entity                      
Condensed Financial Statements, Captions [Line Items]                      
Notes receivable             216,946,000 209,013,000      
Parent Company | Consolidation, Eliminations | Affiliated Entity | Conversion Option                      
Condensed Financial Statements, Captions [Line Items]                      
Notes receivable             12,900,000 6,300,000      
Parent Company | Intersegment Eliminations                      
Condensed Financial Statements, Captions [Line Items]                      
Fair value of receivable             12,900,000 6,300,000      
Unrealized loss on receivable             6,600,000 (9,700,000) (32,200,000)    
Interest income             $ 7,933,000 7,933,000 6,605,000    
Parent Company | Intersegment Eliminations | Related Party                      
Condensed Financial Statements, Captions [Line Items]                      
Notes receivable           $ 250,000          
Parent                      
Condensed Financial Statements, Captions [Line Items]                      
Deferred income taxes, net               324,113,000 318,647,000    
Income tax benefit               (5,783,000) (21,677,000)    
Net income (loss)               (23,272,000) (23,789,000)    
Additional paid-in capital               415,649,000 405,957,000    
Retained earnings (accumulated deficit)               (24,758,000) (1,486,000)    
Net income (loss)               (23,272,000) (23,789,000)    
Deferred income taxes               (5,783,000) (21,677,000)    
Accrued expenses               (104,000) 118,000    
Net cash provided by Operating activities               (1,093,000) (7,213,000)    
Parent | Impact of Adjustment                      
Condensed Financial Statements, Captions [Line Items]                      
Deferred income taxes, net               17,088,000 14,205,000    
Income tax benefit               (2,862,000) (4,094,000)    
Net income (loss)               2,862,000 4,094,000    
Income tax expense               2,862,000      
Retained earnings and deferred tax assets                     $ 10,094,000
Additional paid-in capital               38,000 17,000    
Retained earnings (accumulated deficit)               17,050,000 14,188,000    
Net income (loss)               2,862,000 4,094,000    
Deferred income taxes               (1,657,000) (4,094,000)    
Accrued expenses               (1,205,000) 0    
Net cash provided by Operating activities               0 0    
Parent | As previously reported                      
Condensed Financial Statements, Captions [Line Items]                      
Deferred income taxes, net               307,025,000 304,442,000    
Income tax benefit               (2,921,000) (17,583,000)    
Net income (loss)               (26,134,000) (27,883,000)    
Additional paid-in capital               415,611,000 405,940,000    
Retained earnings (accumulated deficit)               (41,808,000) (15,674,000)    
Net income (loss)               (26,134,000) (27,883,000)    
Deferred income taxes               (4,126,000) (17,583,000)    
Accrued expenses               1,101,000 118,000    
Net cash provided by Operating activities               $ (1,093,000) $ (7,213,000)