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Associate Retirement Plans - Additional Information (Detail)
 12 Months Ended
Dec. 30, 2017
USD ($)
Trust
Dec. 31, 2016
USD ($)
Jan. 02, 2016
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plans expense $ 7,900,000 $ 11,900,000 $ 21,100,000
Cash surrender value of plan assets included in other long term assets 138,193,000 94,242,000  
Aggregate amount of life insurance coverage $ 15,000,000    
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
Distribution charges $ 2,600,000 2,800,000  
Settlement accounting charges $ 500,000 700,000  
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    
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%    
Critical and declining zone fund status Less than 65 percent    
Michigan Conference of Teamsters and Ohio Conference of Teamsters Health and Welfare Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Pension contributions during last plan year $ 14,100,000 14,300,000 15,100,000
Central States, Southeast and Southwest Areas Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Pension contributions during last plan year $ 13,400,000 13,400,000 $ 12,900,000
Collective bargaining arrangement description The Company is party to four CBAs that require contributions to the Plan with expiration dates ranging from January 2019 to February 2021. These CBAs cover warehouse personnel and drivers in Grand Rapids, Michigan and Bellefontaine and Lima, Ohio.    
Cash Balance Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Average long-term expected return on pension plan assets 4.84%    
Expected Company contribution in 2018 $ 2,000,000    
Retiree Medical Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expected Company contribution in 2018 400,000    
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 critical and declining zone plans 65.00%    
Projected insolvent period based on active to inactive participants ratio. 20 years    
Maximum [Member] | Central States, Southeast and Southwest Areas Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expiration dates of collective bargaining arrangements Feb. 28, 2021    
Percentage representing contribution funded to plan total contribution 5.00%    
Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Projected insolvent period based on active to inactive participants ratio. 15 years    
Minimum [Member] | Central States, Southeast and Southwest Areas Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expiration dates of collective bargaining arrangements Jan. 31, 2019    
Cash Surrender Value [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Cash surrender value of plan assets included in other long term assets $ 4,300,000 $ 4,200,000