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Retirement Plans - Weighted Average Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost (Detail)
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Weighted-average assumptions used to determine benefit obligations at fiscal year-end:    
Discount rate 4.46% 3.80%
Weighted average assumptions used to determine net periodic benefit cost for the years ended:    
Discount rate 3.80% 4.35%
Expected long-term rate of return on plan assets 7.00% 7.25%
Pension [Member]    
Weighted-average assumptions used to determine benefit obligations at fiscal year-end:    
Rate of compensation increase 3.82% 3.92%
Weighted average assumptions used to determine net periodic benefit cost for the years ended:    
Rate of compensation increase 3.92% 3.97%
SERP [Member]    
Weighted-average assumptions used to determine benefit obligations at fiscal year-end:    
Rate of compensation increase 7.00% 7.00%
Weighted average assumptions used to determine net periodic benefit cost for the years ended:    
Rate of compensation increase 7.00% 7.00%