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Leases (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Dec. 29, 2018
USD ($)
capital_lease
Dec. 30, 2017
USD ($)
capital_lease
Dec. 31, 2016
USD ($)
Operating Leases        
2019   $ 24,387,000    
2020   18,250,000    
2021   13,324,000    
2022   9,082,000    
2023   6,228,000    
Thereafter   10,469,000    
Total minimum lease payments   $ 81,740,000    
Number of capitalized leases | capital_lease   0 0  
Rent expense   $ 31,027,000 $ 32,158,000 $ 35,288,000
Contingent rent expense under operating leases   0 $ 0 $ 0
Manufacturing Facility        
Sale Leaseback Transaction [Line Items]        
Term of lease 10 years      
Net proceeds $ 16,900,000      
Deferred gain   5,100,000    
Deferred gain current   500,000    
Deferred gain noncurrent   $ 4,200,000