Business and Summary of Significant Accounting Policies - New Accounting Pronouncements - Additional Information (Details) - USD ($) $ in Thousands		Mar. 30, 2019	Dec. 30, 2018	Dec. 29, 2018
Accounting Policies [Line Items]
Net Operating Lease, Right-of-Use Asset		$ 303,820		$ 0
Operating Lease Liability	[1]	332,643
Operating Lease, Liability Current		54,197		0
Operating Lease, Liability Noncurrent		$ 278,446		$ 0
Accounting Standards Update 2016-02
Accounting Policies [Line Items]
Net Operating Lease, Right-of-Use Asset			$ 299,000
Operating Lease Liability			327,000
Operating Lease, Liability Current			52,000
Operating Lease, Liability Noncurrent			275,000
Deferred rent and lease incentive liabilities			$ 28,000

[1] Includes the current portion of $54 million for operating lease liabilities.