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Associate Retirement Plans - Additional Information (Detail)
 9 Months Ended 12 Months Ended
Dec. 28, 2013
USD ($)
Dec. 31, 2016
USD ($)
Jan. 02, 2016
USD ($)
Trust
Jan. 03, 2015
USD ($)
Dec. 31, 2014
USD ($)
Defined Benefit Plan Disclosure [Line Items]          
Defined contribution plans expense $ 4,800,000   $ 21,100,000 $ 13,600,000  
Number of Trusts | Trust     2    
Percentage of trust funded with pre-merger liability to plan participants     125.00%    
Proceeds from company owned life insurance     $ 5,004,000    
Cash surrender value of plan assets included in other long term assets     135,261,000 124,453,000  
Aggregate amount of life insurance coverage     $ 15,000,000    
Defined contribution plans maximum requisite service period     30 years    
Defined contribution plan employees minimum period of service     10 years    
Defined contribution plan employees age to eligible under the plan     55 years    
Maximum age of major medical insurance with deductible and coinsurance provisions     65 years    
Multiplier effect of Monthly postretirement health care benefits to covered employees     $ 5    
Accumulated benefit obligation     $ 83,400,000 93,000,000  
Actuarial gains and losses are amortized when accumulation of such gains and losses exceeds     10.00%    
Percentage point increase or decrease in assumed health care cost trend rate     1.00%    
Red zone fund status     Less than 65 percent    
Maximum [Member]          
Defined Benefit Plan Disclosure [Line Items]          
1% increase or decrease in assumed health care cost trend rate in accumulated postretirement benefit obligation     $ 100,000    
Status or red zone plans     65.00%    
Cash Balance Pension Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Distribution charges       10,600,000  
Settlement accounting charge       1,600,000  
Accumulated benefit obligation         $ 52,400,000
Average long-term expected return on pension plan assets     5.05%    
Cash Balance Pension Plan [Member] | Forecast [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Standard pension funding carryover   $ 0      
Super Foods Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Distribution charges       10,600,000  
Settlement accounting charge       1,600,000  
Accumulated benefit obligation         $ 40,600,000
Central States, Southeast and Southwest Areas Pension Fund [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Pension contributions during last plan year $ 6,800,000   $ 12,900,000 12,900,000  
Cash Surrender Value [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Cash surrender value of plan assets included in other long term assets     $ 4,200,000 $ 4,200,000