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SCHEDULE I: CONDENSED FINANCIAL INFORMATION OF REGISTRANT - STATEMENTS OF CASH FLOWS (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 11 Months Ended 12 Months Ended
Feb. 03, 2015
Dec. 28, 2016
Sep. 28, 2016
Jun. 29, 2016
Mar. 30, 2016
Dec. 30, 2015
Sep. 30, 2015
Jul. 01, 2015
Apr. 01, 2015
Dec. 30, 2015
Dec. 28, 2016
Dec. 30, 2015
Dec. 31, 2014
OPERATING ACTIVITIES                          
Net income $ (13,049) $ 5,457 $ 6,789 $ 6,549 $ 3,351 $ 3,046 $ 6,193 $ 5,145 $ (11,260) $ 16,173 $ 22,146 $ 3,124 $ 2,118
Deferred income taxes                     (523) (734) (93)
Other Noncash Income (Expense)                     (688) 0 0
Increase (Decrease) in Accounts Receivable                     (2,974) (775) 1,751
Increase (Decrease) in Prepaid Expense and Other Assets                     756 958 1,168
Adjustments to reconcile net income to net cash provided by operating activities:                          
Equity-based compensation                     5,354 16,681 165
Changes in operating assets and liabilities:                          
Accrued expenses                     5,560 2,548 3,349
Other current liabilities                     2,130 257 420
INVESTING ACTIVITIES                          
NET CASH USED IN INVESTING ACTIVITIES                     (114,761) (34,514) (28,515)
FINANCING ACTIVITIES                          
Proceeds from issuance of Class A common stock sold in initial public offering, net of underwriting discounts and commissions                     0 109,262 0
Proceeds from issuance of Class B common stock                     0 30 0
Proceeds from Stock Options Exercised                     3,194 0 0
NET CASH PROVIDED BY FINANCING ACTIVITIES                     1,234 61,428 4,532
NET CASH PROVIDED BY OPERATING ACTIVITIES                     54,285 41,258 13,584
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                     (59,242) 68,172 (10,399)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD         70,849           70,849   2,677
CASH AND CASH EQUIVALENTS AT END OF PERIOD   11,607       70,849       70,849 11,607 70,849  
Non-cash financing activities:                          
Establishment of liabilities under tax receivable agreement                     100,063 173,090 0
Class A Common Stock | IPO And Organizational Transaction                          
Non-cash investing activities:                          
Class A common stock issued                     0 6 0
Class A Common Stock | USC Merger                          
Non-cash investing activities:                          
Class A common stock issued                     0 2 0
Class A Common Stock | Secondary Offering and Redemption of Units                          
Non-cash investing activities:                          
Class A common stock issued                     5 6 0
Class B Common Stock | IPO And Organizational Transaction                          
Non-cash financing activities:                          
Cancellation of Class B common stock                       (6) 0
Class B Common Stock | USC Merger                          
Non-cash financing activities:                          
Cancellation of Class B common stock                     0 (2) 0
Class B Common Stock | Secondary Offering and Redemption of Units                          
Non-cash financing activities:                          
Cancellation of Class B common stock                     (5) (6) 0
Parent Company                          
OPERATING ACTIVITIES                          
Net income                     12,446 4,273 0
Non-cash reimbursement revenue treated as investment [Line Items]                     (189) 0 0
Deferred income taxes                     (462) (551) 0
Other Noncash Income (Expense)                     (688) 0 0
Increase (Decrease) in Accounts Receivable                     2 0 0
Increase (Decrease) in Prepaid Expense and Other Assets                     1 0 0
Adjustments to reconcile net income to net cash provided by operating activities:                          
Equity income from affiliates                     (16,982) (6,906) 0
Equity-based compensation                     189 330 0
Changes in operating assets and liabilities:                          
Due from SSE Holdings                     214 4 0
Accrued expenses                     (11) 58 0
Other current liabilities                     17 0 0
Income taxes payable                     5,023 3,184 0
INVESTING ACTIVITIES                          
Purchases of LLC Interests from SSE Holdings                     (4,559) (112,298) 0
Return of investment in SSE Holdings [Line Items]                     2,694 0 0
NET CASH USED IN INVESTING ACTIVITIES                     (1,865) (112,298) 0
FINANCING ACTIVITIES                          
Proceeds from issuance of Class A common stock sold in initial public offering, net of underwriting discounts and commissions                     0 112,298 0
Proceeds from issuance of Class A common stock to SSE Holdings upon settlement of stock option exercises [Line Items]                     2,489 0 0
Proceeds from issuance of Class B common stock                     0 30 0
Proceeds from Stock Options Exercised                     3,185 0 0
NET CASH PROVIDED BY FINANCING ACTIVITIES                     5,674 112,328 0
NET CASH PROVIDED BY OPERATING ACTIVITIES                     (446) 392 0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                     3,363 422 0
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD $ 0       $ 422       $ 0   422 0 0
CASH AND CASH EQUIVALENTS AT END OF PERIOD   $ 3,785       $ 422       $ 422 3,785 422 0
Parent Company | Class A Common Stock | IPO And Organizational Transaction                          
Non-cash investing activities:                          
Class A common stock issued                     0 6 0
Parent Company | Class A Common Stock | USC Merger                          
Non-cash investing activities:                          
Class A common stock issued                     0 2 0
Parent Company | Class A Common Stock | Secondary Offering and Redemption of Units                          
Non-cash investing activities:                          
Class A common stock issued                     18,944 19,933 0
Parent Company | Class B Common Stock | IPO And Organizational Transaction                          
Non-cash financing activities:                          
Cancellation of Class B common stock                     0 (6) 0
Parent Company | Class B Common Stock | USC Merger                          
Non-cash financing activities:                          
Cancellation of Class B common stock                     $ 0 (2) 0
Parent Company | Class B Common Stock | Secondary Offering and Redemption of Units                          
Non-cash financing activities:                          
Cancellation of Class B common stock                       $ (6) $ 0