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Summary of Significant Accounting Policies - (Leases and Subleases) (Details) - USD ($)
$ in Thousands
Dec. 30, 2020
Dec. 25, 2019
Dec. 27, 2018
Lessee, Lease, Description [Line Items]      
Operating lease liabilities $ 154,390    
Operating lease ROU assets 139,534 $ 158,550  
Deficit (194,514) (189,398)  
Deferred Tax Assets, Net $ 23,210 $ 14,718  
Accounting Standards Update 2016-02      
Lessee, Lease, Description [Line Items]      
Operating lease liabilities     $ 101,300
Operating lease ROU assets     94,200
Accounting Standards Update 2016-02 | Cumulative Effect, Period of Adoption, Adjustment      
Lessee, Lease, Description [Line Items]      
Deficit     400
Deferred Tax Assets, Net     $ 100