Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Income Taxes [Line Items]
One-time income tax benefit			$ 4.5
Interest and penalties included in provision for incomes taxes	$ 0.0	$ 0.0	$ 0.1
Accrued interest and penalties	0.2	0.1
Unrecognized tax benefits that would impact the effective tax rate if recognized	0.8	$ 0.8
Deferred tax assets capital loss carryforward	$ 1.1
Deferred tax assets capital loss carryforward expiration year	2021
State and Local Jurisdiction
Income Taxes [Line Items]
Income tax return examination	In September 2017, the Internal Revenue Service (“IRS”) commenced an examination of the Company’s 2015 consolidated corporate income tax return. The examination was completed in July 2018 resulting in a no change report. As of December 26, 2020, the Company’s 2017, 2018, and 2019 federal income tax returns remain subject to examination by IRS. The Company’s state income tax returns remain subject to examination for three or four years depending on the state’s statute of limitations.
State and Local Jurisdiction | Minimum
Income Taxes [Line Items]
Income tax return examination period	3 years
State and Local Jurisdiction | Maximum
Income Taxes [Line Items]
Income tax return examination period	4 years