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Summary of Significant Accounting Policies - GNU Interest (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
May 03, 2017
Apr. 13, 2016
Jan. 08, 2015
Dec. 30, 2017
Sep. 30, 2017
Jul. 01, 2017
Apr. 01, 2017
Dec. 31, 2016
Oct. 01, 2016
Jul. 02, 2016
Apr. 02, 2016
Jan. 02, 2016
Apr. 04, 2015
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
GNU Interest                                
Repayments of note payable                             $ 75 $ 300
Gain on extinguishment of debt                               606
Net revenue       $ 97,016 $ 91,325 $ 93,563 $ 88,171 $ 79,569 $ 81,691 $ 82,607 $ 80,912     $ 370,075 324,779 303,559
Net income       $ (2,261) $ 3,225 3,907 $ 2,830 $ 2,076 $ 3,151 6,767 $ 2,239     7,701 14,233 6,325
Net income (loss), net of amounts allocable to its other owners                           7,573 12,793 7,598
Sale of GNU interest                                
Purchase price received                           250 1,100  
GNU gain on sale of business assets                           $ 250 3,836  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | GNU                                
Sale of GNU interest                                
Purchase price   $ 1,350                            
Purchase price received $ 250 $ 1,100                            
GNU gain on sale of business assets                   2,100            
GNU                                
GNU Interest                                
Percentage of ownership interest held by the entity                           55.89%    
GNU | Disposal Group, Disposed of by Sale, Not Discontinued Operations | GNU                                
Sale of GNU interest                                
GNU gain on sale of business assets           250       $ 3,800            
CRA | Disposal Group, Disposed of by Sale, Not Discontinued Operations | GNU                                
Sale of GNU interest                                
GNU gain on sale of business assets           $ 140                    
GNU gain received on sale of business assets                           $ 600    
GNU                                
GNU Interest                                
Note payable     $ 1,000                          
Repayments of note payable     $ 400                          
Gain on extinguishment of debt                         $ 600      
Net revenue                             800 3,800
Net income                           200 3,000 (3,000)
Net income (loss), net of amounts allocable to its other owners                           $ 100 $ 1,700 $ 1,300
Goodwill and intangible asset impairment charges                       $ 4,500