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Retirement Plans - Weighted Average Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost (Detail)
12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Weighted-average assumptions used to determine benefit obligations at fiscal year-end:    
Discount rate 4.35% 5.00%
Weighted average assumptions used to determine net periodic benefit cost for the years ended:    
Discount rate 5.00% 4.37%
Expected long-term rate of return on plan assets 7.25% 7.50%
Pension [Member]    
Weighted-average assumptions used to determine benefit obligations at fiscal year-end:    
Rate of compensation increase 4.85% 4.85%
Weighted average assumptions used to determine net periodic benefit cost for the years ended:    
Rate of compensation increase 4.85% 4.85%
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%