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Significant Accounting Policies - Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 02, 2021
Dec. 28, 2019
Selling, general and administrative    
Lessee, Lease, Description [Line Items]    
Lease impairment loss $ 27.3 $ 7.9
Restructuring charges    
Lessee, Lease, Description [Line Items]    
Lease impairment loss $ 2.9 $ 1.7