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INCOME TAXES- Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 26, 2018
Dec. 27, 2017
Income Tax Disclosure [Abstract]    
Deferred Tax Asset, Valuation Allowance, Other $ 733  
Deferred Tax Asset, Valuation Allowance, Tax Credit (6,192)  
Deferred tax assets:    
Investment in partnership 168,451 $ 137,449
Tax Receivable Agreement 57,203 43,464
Deferred rent 1,109 571
Deferred revenue 184 59
Stock-based compensation 375 322
Net operating loss carryforwards 18,046 12,332
Tax credits 5,194 2,328
Other assets 331 176
Total gross deferred tax assets 250,893 196,701
Valuation allowance (6,925) (10,114)
Total deferred tax assets, net of valuation allowance 243,968 186,587
Deferred tax liabilities:    
Property and equipment (1,435) (673)
Total gross deferred tax liabilities (1,435) (673)
Net deferred tax assets $ 242,533 $ 185,914