Business and Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($) $ in Thousands	Jan. 03, 2021	Jan. 02, 2021	Dec. 29, 2019	Dec. 28, 2019	Dec. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities		$ 385,727
TIA treated as reduction of lease payments used to measure operating lease ROU assets		36,000		$ 35,200
Deferred rent treated as reduction of lease payments used to measure operating lease ROU assets		17,500		15,000
Right of use assets		340,141		348,090
Long-term debt		624,611		536,396
Deferred tax liabilities		132,223		104,468
Additional paid-in capital		795,697		700,121
Retained earnings		$ 142,880		$ 107,132
ASU No. 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities					$ 339,600
TIA treated as reduction of lease payments used to measure operating lease ROU assets					24,300
Deferred rent treated as reduction of lease payments used to measure operating lease ROU assets					11,900
Prepaid rent as increase in lease payments used to measure ROU assets					5,800
Right of use assets					308,500
ASU No. 2016-02 | Effect of adoption of new accounting standard
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings					$ (500)
ASU No. 2016-13 | Effect of adoption of new accounting standard
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses			$ 700
Retained earnings			$ (500)
ASU No. 2020-06 | Effect of adoption of new accounting standard | Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Long-term debt	$ 83,000
Deferred tax liabilities	(19,000)
Additional paid-in capital	(71,000)
Retained earnings	$ 7,000