Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Narrative (Details)

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Commitments and Contingencies - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 27, 2018
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Other Commitments [Line Items]          
Operating leases, rent expense     $ 10,200,000 $ 4,200,000  
Insurance deductible   $ 300,000 300,000   $ 300,000
Insurance aggregate stop loss   2,000,000 2,000,000   2,000,000
Workers compensation and auto claims insurance, aggregate stop loss per claim basis   200,000 200,000    
Workers compensation and auto claims insurance, aggregate stop loss per calendar year   5,800,000 5,800,000    
Insurance reserves   4,183,000 4,183,000   2,942,000
Warranty accrual   0 0   0
Product warranty expense     0 $ 0  
Commitments and contingencies    
Maximum annual contributions per employee, percent     92.00%    
Employer matching contribution, percent of match     3.00%    
Employer discretionary contribution amount   1,800,000 $ 3,400,000    
Outstanding Bid Bond          
Other Commitments [Line Items]          
Commitments and contingencies   1,100,000 1,100,000    
Performance And Payment Bond          
Other Commitments [Line Items]          
Commitments and contingencies   1,600,000 1,600,000    
Estimated cost to complete the project   $ 600,000 $ 600,000    
Wendco Of Puerto Rico Inc, Multisystem Restaurant Inc, Restaurant Operators Inc, Apple Caribe, Inc          
Other Commitments [Line Items]          
Loss contingency, damages sought $ 300,000,000