Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Non-cash impairment of restaurants (Details)

v3.19.1
Fair Value Measurements - Non-cash impairment of restaurants (Details)
$ in Thousands
4 Months Ended
Apr. 21, 2019
USD ($)
restaurant
Dec. 31, 2018
USD ($)
Dec. 30, 2018
USD ($)
Apr. 22, 2018
USD ($)
Dec. 31, 2017
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Number of restaurants impaired | restaurant 11        
Adjustments due to Topic 842   $ (15,172)      
Retained earnings $ 367,586   $ 382,805 $ 392,704 $ 387,435
Retained earnings 361,808 361,169 376,341    
Retained Earnings          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Retained earnings $ 361,808   $ 376,341 $ 387,140 $ 382,760
Accounting Standards Update 2016-02          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Retained earnings   $ (15,172)