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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 30, 2017	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Corporate income tax rate		21.00%	21.00%	35.00%
Income tax benefit recorded as estimate to the impact of the act	$ 48,200		$ 5,575	$ 48,160
Adjustments in discrete tax benefit		$ 5,600
Adjustments in reduction to federal income tax payable		16,400
Increase to federal deferred tax liabilities		10,800
Gross amount of unrecognized tax benefits	$ 1,259	306	750	$ 1,259	$ 1,754
Unrecognized tax benefits that would impact effective tax rate		300
Unrecognized tax benefit, accrued interest		100	$ 100
Domestic Tax Authority
Income Taxes [Line Items]
Federal net operating loss carryforwards		3,400
State and Local Jurisdiction
Income Taxes [Line Items]
State net operating loss carryforwards		5,600
Credit carryforwards		$ 4,300
Operating loss carryforwards expiration date		Dec. 31, 2037
Unrecognized tax benefits that would impact effective tax rate		$ 100

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