Retirement Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 25, 2020	Dec. 27, 2019	Dec. 28, 2018
Compensation And Retirement Disclosure [Abstract]
Benefit obligations	$ 9.7
Fair value of benefit plan assets	6.7
Unfunded balance of benefit plan	3.0
Amounts recognized in accumulated other comprehensive income	0.5	$ 1.7
Contributions to the plan by the Company and its subsidiaries	2.8
Benefits expected to be paid from pension plan in 2021	0.9
Benefits expected to be paid from pension plan in 2022	1.0
Benefits expected to be paid from pension plan in 2023	2.3
Benefits expected to be paid from pension plan in 2024	1.0
Benefits expected to be paid from pension plan in 2025	1.0
Aggregate benefits expected to be paid in five years from 2026-2031	$ 5.9
Contribution from salary	25.00%
Matching contribution of participation salary	50.00%
Matching contribution based upon eligibility	6.00%
Discretionary employer contributions	$ 2.4	$ 2.3	$ 1.2