Benefit Plans - Liability Under Executive Benefit Plans (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 29, 2019
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	$ 31,653	$ 33,699
Executive Benefit Plans | Supplemental Savings Incentive Plan and Director Deferral Plan
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	11,132	8,893
Noncurrent liabilities	80,890	79,921
Total liability	92,022	88,814
Executive Benefit Plans | Long-Term Retention Plan
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	137	102
Noncurrent liabilities	4,728	3,199
Total liability	4,865	3,301
Executive Benefit Plans | Officer Retention Plan
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	4,176	3,267
Noncurrent liabilities	38,605	41,062
Total liability	42,781	44,329
Executive Benefit Plans | Long-Term Performance Plan
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	8,515	7,252
Noncurrent liabilities	7,866	8,416
Total liability	$ 16,381	$ 15,668