Benefit Plans - Liability Under Executive Benefit Plans (Detail) - USD ($) $ in Thousands	Dec. 30, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	$ 29,300	$ 27,024
Supplemental Savings Incentive Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	8,255	8,205
Noncurrent liabilities	73,524	74,958
Total liability	81,779	83,163
Long-Term Retention Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	42	3
Noncurrent liabilities	2,140	2,563
Total liability	2,182	2,566
Officer Retention Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	3,014	2,949
Noncurrent liabilities	42,179	42,694
Total liability	45,193	45,643
Long-Term Performance Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	5,234	5,561
Noncurrent liabilities	5,244	4,527
Total liability	$ 10,478	$ 10,088