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Leases - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended 12 Months Ended
Feb. 28, 2020
Jan. 31, 2020
Jun. 20, 2019
May 19, 2019
Jun. 20, 2019
Jun. 27, 2020
Jun. 29, 2019
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Operating Leased Assets [Line Items]                    
Lease renewal term           5 years        
Finance lease, term of contractt       15 years         15 years  
Finance lease, renewal term       5 years         5 years 10 years
Unrecognized deferred gains, topic 840           $ 84,000   $ 85,800    
Proceeds from real estate financing transactions           $ 78,263 $ 44,822      
Minimum                    
Operating Leased Assets [Line Items]                    
Lease term           1 year        
Maximum                    
Operating Leased Assets [Line Items]                    
Lease term           15 years        
Warehouse faciility                    
Operating Leased Assets [Line Items]                    
Finance lease, renewal term           5 years        
Proceeds from real estate financing transactions $ 7,500 $ 34,100     $ 45,000 $ 78,300   $ 27,200    
Warehouse faciility | Minimum                    
Operating Leased Assets [Line Items]                    
Finance lease, term of contractt           15 years        
Warehouse faciility | Maximum                    
Operating Leased Assets [Line Items]                    
Finance lease, term of contractt           18 years        
Warehouse faciility | University Park, IL                    
Operating Leased Assets [Line Items]                    
Proceeds from real estate financing transactions       $ 21,800            
Warehouse faciility | Yulee, FL                    
Operating Leased Assets [Line Items]                    
Proceeds from real estate financing transactions     $ 13,300