Income Taxes - Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 27, 2020	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018
Current tax expense/(benefit)
Federal									$ 21,414	$ 16,283	$ 31,719
Foreign									905	823	705
State and local									7,453	3,146	10,172
Total current tax expense									29,772	20,252	42,596
Deferred tax expense/(benefit)
Federal									(9,249)	5,588	913
State and local									(5,928)	(1,346)	5,122
Total deferred tax expense									(15,177)	4,242	6,035
Income tax expense	$ (4,475)	$ 7,283	$ 5,781	$ 6,006	$ 7,705	$ 6,070	$ 9,415	$ 1,304	14,595	24,494	$ 48,631
Operating loss carryforward, state and local	$ 1,300				$ 1,600				$ 1,300	$ 1,600
Maximum
Deferred tax expense/(benefit)
Operating loss carryforwards, remaining life (in years)									17 years