Leases - Undiscounted Cash Flows for the Finance and Operating Leases (Detail) - USD ($) $ in Thousands	Mar. 27, 2021	Dec. 26, 2020
Operating Leased Assets [Line Items]
2021 Remainder	$ 27,426
2022	28,753
2023	21,742
2024	11,827
2025	5,580
Total future minimum lease payments	95,328
Less amount representing interest (1.9% to 4.4%)	4,332
Present value of minimum lease payments	90,996
Current maturities of long-term debt	32,800	$ 35,415
Long-term debt, excluding current maturities	58,196	$ 65,359
2021 Remainder	564
2022	686
2023	600
2024	516
2025	275
Total future minimum lease payments	2,641
Less amount representing interest (2.1% to 4.4%)	201
Present value of minimum lease payments	2,440
Other current liabilities [Member]
Operating Leased Assets [Line Items]
Operating lease, liability, current	728
Deferred income taxes and other noncurrent liabilities [Member]
Operating Leased Assets [Line Items]
Operating lease, liability, non-current	$ 1,712