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SCHEDULE I: CONDENSED FINANCIAL INFORMATION OF REGISTRANT - STATEMENTS OF CASH FLOWS (Details) - USD ($) | 3 Months Ended | 12 Months Ended
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Dec. 26, 2018 | Sep. 26, 2018 | Jun. 27, 2018 | Mar. 28, 2018 | Dec. 27, 2017 | Sep. 27, 2017 | Jun. 28, 2017 | Mar. 29, 2017 | Dec. 26, 2018 | Dec. 27, 2017 | Dec. 28, 2016
OPERATING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Net income | $ (548,000) | $ 6,946,000 | $ 10,571,000 | $ 4,979,000 | $ (11,032,000) | $ 7,870,000 | $ 8,184,000 | $ 3,682,000 | $ 21,948,000 | $ 8,884,000 | $ 22,146,000
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity-based compensation |  |  |  |  |  |  |  |  | 6,143,000 | 5,623,000 | 5,354,000
Deferred income taxes |  |  |  |  |  |  |  |  | 788,000 | 146,334,000 | (523,000)
Other non-cash income |  |  |  |  |  |  |  |  | (78,000) | (127,221,000) | (688,000)
Changes in operating assets and liabilities: |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  |  |  | 5,530,000 | 6,421,000 | 2,974,000
Prepaid expenses and other current assets |  |  |  |  |  |  |  |  | (270,000) | 2,244,000 | (756,000)
Accrued expenses |  |  |  |  |  |  |  |  | 7,979,000 | 4,388,000 | 5,560,000
Other current liabilities |  |  |  |  |  |  |  |  | 860,000 | (988,000) | 2,130,000
NET CASH PROVIDED BY OPERATING ACTIVITIES |  |  |  |  |  |  |  |  | 85,395,000 | 70,878,000 | 54,285,000
INVESTING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
NET CASH USED IN INVESTING ACTIVITIES |  |  |  |  |  |  |  |  | (86,604,000) | (61,943,000) | (114,761,000)
FINANCING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Proceeds from stock option exercises |  |  |  |  |  |  |  |  | 5,472,000 | 7,585,000 | 3,194,000
Payments under tax receivable agreement |  |  |  |  |  |  |  |  | 0 | (4,844,000) | 0
NET CASH PROVIDED BY FINANCING ACTIVITIES |  |  |  |  |  |  |  |  | 4,452,000 | 965,000 | 1,234,000
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS |  |  |  |  |  |  |  |  | 3,243,000 | 9,900,000 | (59,242,000)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD |  |  |  | 21,507,000 |  |  |  | 11,607,000 | 21,507,000 | 11,607,000 | 70,849,000
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 24,750,000 |  |  |  | 21,507,000 |  |  |  | 24,750,000 | 21,507,000 | 11,607,000
Parent Company |  |  |  |  |  |  |  |  |  |  |
OPERATING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 15,179,000 | (320,000) | 12,446,000
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | (21,537,000) | (22,090,000) | (16,982,000)
Equity-based compensation |  |  |  |  |  |  |  |  | 252,000 | 234,000 | 189,000
Non-cash reimbursement revenue treated as investment |  |  |  |  |  |  |  |  | 0 | 0 | (189,000)
Deferred income taxes |  |  |  |  |  |  |  |  | 777,000 | 146,095,000 | (462,000)
Other non-cash income |  |  |  |  |  |  |  |  | (78,000) | (127,221,000) | (688,000)
Changes in operating assets and liabilities: |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  |  |  | 0 | 2,000 | (2,000)
Prepaid expenses and other current assets |  |  |  |  |  |  |  |  | 0 | 5,000 | (1,000)
Due to/from SSE Holdings |  |  |  |  |  |  |  |  | (7,103,000) | (5,339,000) | 214,000
Accrued expenses |  |  |  |  |  |  |  |  | 5,669,000 | 21,000 | (11,000)
Other current liabilities |  |  |  |  |  |  |  |  | 14,000 | (17,000) | 17,000
Income taxes payable |  |  |  |  |  |  |  |  | 0 | 2,990,000 | 5,023,000
NET CASH PROVIDED BY OPERATING ACTIVITIES |  |  |  |  |  |  |  |  | (6,827,000) | (5,640,000) | (446,000)
INVESTING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Purchases of LLC Interests from SSE Holdings |  |  |  |  |  |  |  |  | (11,142,000) | (5,522,000) | (4,559,000)
Return of investment in SSE Holdings |  |  |  |  |  |  |  |  | 2,053,000 | 4,101,000 | 2,694,000
NET CASH USED IN INVESTING ACTIVITIES |  |  |  |  |  |  |  |  | (9,089,000) | (1,421,000) | (1,865,000)
FINANCING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of Class A common stock to SSE Holdings upon settlement of stock option exercises |  |  |  |  |  |  |  |  | 11,142,000 | 5,522,000 | 2,489,000
Proceeds from stock option exercises |  |  |  |  |  |  |  |  | 5,472,000 | 7,586,000 | 3,185,000
Payments under tax receivable agreement |  |  |  |  |  |  |  |  | 0 | (4,844,000) | 0
NET CASH PROVIDED BY FINANCING ACTIVITIES |  |  |  |  |  |  |  |  | 16,614,000 | 8,264,000 | 5,674,000
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS |  |  |  |  |  |  |  |  | 698,000 | 1,203,000 | 3,363,000
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD |  |  |  | $ 4,988,000 |  |  |  | $ 3,785,000 | 4,988,000 | 3,785,000 | 422,000
CASH AND CASH EQUIVALENTS AT END OF PERIOD | $ 5,686,000 |  |  |  | $ 4,988,000 |  |  |  | $ 5,686,000 | $ 4,988,000 | $ 3,785,000

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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