Leases - Operating Lease Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2020	Dec. 29, 2019
Operating Lease, Additional Information [Abstract]
Cash paid for amounts included in the measurement of operating lease liabilities	$ 11,533	$ 9,101
Right-of-use assets obtained in exchange for operating lease liabilities	$ 9,004	$ 61,270
Weighted-average remaining lease term-operating leases (in years)	8 years 8 months 12 days	9 years 8 months 12 days
Weighted-average discount rate-operating leases (as a percent)	4.41%	4.64%
Selling, General and Administrative Expenses
Obligation with Joint and Several Liability Arrangement [Line Items]
Operating lease cost	$ 11,467	$ 9,980
Short term and variable lease cost	1,776	1,814
Total lease cost	$ 13,243	$ 11,794