Summary of Significant Accounting Policies (Leases) (Details) - USD ($) $ in Thousands	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Lessee, Lease, Description [Line Items]
Retained earnings increase	$ 590,745	$ 584,368	$ 563,259	$ 514,577
Right-of-use assets	76,314	75,012
Lease liabilities	79,324	82,596
Retained Earnings
Lessee, Lease, Description [Line Items]
Retained earnings increase	$ 517,994	529,723	504,909	$ 467,296
Impact of Implementation of Lease Guidance
Lessee, Lease, Description [Line Items]
Right-of-use assets			73,800
Lease liabilities			82,000
Cumulative Effect, Period of Adoption, Adjustment
Lessee, Lease, Description [Line Items]
Retained earnings increase		(131)
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings
Lessee, Lease, Description [Line Items]
Retained earnings increase		$ (131)
Cumulative Effect, Period of Adoption, Adjustment | Impact of Implementation of Lease Guidance
Lessee, Lease, Description [Line Items]
Retained earnings increase			2,999
Cumulative Effect, Period of Adoption, Adjustment | Impact of Implementation of Lease Guidance | Retained Earnings
Lessee, Lease, Description [Line Items]
Retained earnings increase			$ 2,999