Leases - Undiscounted Cash Flows for the Finance and Operating Leases (Detail) - USD ($) $ in Thousands	Sep. 25, 2021	Dec. 26, 2020
Operating Leased Assets [Line Items]
2021 Remainder	$ 11,454
2022	33,585
2023	26,573
2024	16,665
2025	10,418
Thereafter	2,916
Total future minimum lease payments	101,611
Less amount representing interest (1.9% to 4.4%)	4,270
Present value of minimum lease payments	97,341
Current maturities of long-term debt	34,617	$ 35,415
Long-term debt, excluding current maturities	62,724	$ 65,359
2021 Remainder	192
2022	714
2023	634
2024	535
2025	284
Thereafter	0
Total future minimum lease payments	2,359
Less amount representing interest (2.1% to 4.4%)	161
Present value of minimum lease payments	2,198
Other current liabilities [Member]
Operating Leased Assets [Line Items]
Operating lease, liability, current	713
Deferred income taxes and other noncurrent liabilities [Member]
Operating Leased Assets [Line Items]
Operating lease, liability, non-current	$ 1,485