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Postretirement Plans - Additional Information (Detail) - USD ($)
 3 Months Ended 4 Months Ended 6 Months Ended
Oct. 03, 2020
Jul. 13, 2019
Apr. 18, 2020
Apr. 20, 2019
Jul. 13, 2019
Mar. 31, 2020
Pension and Other Postretirement Benefits Disclosure [Line Items]            
Defined benefit plan, loan issued           $ 5,000,000.0
Plan No. 1            
Pension and Other Postretirement Benefits Disclosure [Line Items]            
Defined benefit plan assets, transferred     $ 6,400,000      
Voluntarily contributions made by an employer   $ 0 1,400,000 $ 0    
Defined benefit plan, loan issued     5,000,000.0      
Defined benefit plans non-cash settlement charge     116,200,000      
Settlement loss     111,900,000   $ 0  
Defined benefit plan obligation, curtailment loss     $ 4,300,000      
Plan No. 2 | Scenario Forecast            
Pension and Other Postretirement Benefits Disclosure [Line Items]            
Voluntarily contributions made by an employer $ 2,500,000