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Postretirement Plans - Additional Information (Detail) - USD ($)
 3 Months Ended 4 Months Ended 12 Months Ended
Oct. 03, 2020
Oct. 05, 2019
Oct. 06, 2018
Jul. 14, 2018
Oct. 07, 2017
Apr. 21, 2018
Jan. 02, 2021
Dec. 28, 2019
Dec. 29, 2018
Pension and Other Postretirement Benefits Disclosure [Line Items]                  
Voluntarily contributions made by an employer             $ 0 $ 0  
Cash contributions             0    
Non-cash settlement and curtailment charge             108,800,000    
Settlement loss               0  
Expected pension cost for fiscal 2019             $ 700,000    
Postretirement Benefits, minimum years of service for eligibility             10 years    
Postretirement Benefits, minimum age for eligibility             60 years    
Expected company contribution             $ 616,000    
Expense under plans             $ 109,823,000 $ 3,234,000 $ 8,474,000
Contribution of pension fund in excess of total contribution             5.00% 5.00% 5.00%
Multiemployer plans, minimum contribution             $ 0    
Multiemployer plan, withdrawal obligation         $ 15,200,000 $ 200,000      
Multiemployer plans transition payments payable             $ 3,100,000    
Multiemployer plans payable date             Nov. 03, 2017    
Multiemployer plan withdrawal liability of net present value monthly payments period         20 years        
Multiemployer plans, increase in withdrawal obligation           2,300,000      
Multiemployer plan, withdrawal obligation paid         $ 15,200,000 200,000      
Minimum                  
Pension and Other Postretirement Benefits Disclosure [Line Items]                  
Retiree medical coverage provided             3 years    
Maximum                  
Pension and Other Postretirement Benefits Disclosure [Line Items]                  
Retiree medical coverage provided             5 years    
Pension plans                  
Pension and Other Postretirement Benefits Disclosure [Line Items]                  
Settlement loss             $ (104,473,000)   $ (7,781,000)
Actual return on plan assets             $ 15,790,000 $ 51,848,000 $ 2,400,000
Expected long-term rate of return and average annual return on plan assets             4.97% 5.34% 5.34%
Contribution of company to company pension plans             $ 7,871,000 $ 2,771,000 $ 40,971,000
Last Fifteen Years                  
Pension and Other Postretirement Benefits Disclosure [Line Items]                  
Expected long-term rate of return and average annual return on plan assets             7.00%    
Non Qualified Pension Plans                  
Pension and Other Postretirement Benefits Disclosure [Line Items]                  
Expected company contribution             $ 300,000    
Plan No. 2                  
Pension and Other Postretirement Benefits Disclosure [Line Items]                  
Expected company contribution             0    
Postretirement Benefit Plans                  
Pension and Other Postretirement Benefits Disclosure [Line Items]                  
Contribution of company to company pension plans             575,000 722,000  
Expected company contribution             600,000    
Contributions by participants             573,000 662,000 800,000
Multiemployer Plans                  
Pension and Other Postretirement Benefits Disclosure [Line Items]                  
Expense under plans             $ 1,200,000 1,100,000 1,000,000.0
Red Zone                  
Pension and Other Postretirement Benefits Disclosure [Line Items]                  
Percentage of funded under multi employer plans             Less than 65 percent    
Yellow Zone                  
Pension and Other Postretirement Benefits Disclosure [Line Items]                  
Percentage of funded under multi employer plans             Between 65 and less than 80 percent    
Green Zone                  
Pension and Other Postretirement Benefits Disclosure [Line Items]                  
Percentage of funded under multi employer plans             At least 80 percent    
Plan No. 2                  
Pension and Other Postretirement Benefits Disclosure [Line Items]                  
Voluntarily contributions made by an employer $ 7,600,000 $ 2,500,000 $ 600,000            
Expected long-term rate of return and average annual return on plan assets             5.70%    
Plan No. 1                  
Pension and Other Postretirement Benefits Disclosure [Line Items]                  
Voluntarily contributions made by an employer     $ 100,000 $ 30,000,000.0   $ 10,000,000.0      
Required | Pension plans                  
Pension and Other Postretirement Benefits Disclosure [Line Items]                  
Contribution of company to company pension plans             $ 271,000 1,040,000 271,000
Required | Non Qualified Pension Plans                  
Pension and Other Postretirement Benefits Disclosure [Line Items]                  
Contribution of company to company pension plans             300,000    
Discretionary | Pension plans                  
Pension and Other Postretirement Benefits Disclosure [Line Items]                  
Contribution of company to company pension plans             7,600,000 $ 1,731,000 $ 40,700,000
Discretionary | Qualified Pension Plans                  
Pension and Other Postretirement Benefits Disclosure [Line Items]                  
Contribution of company to company pension plans             $ 7,600,000