Postretirement Plans - Additional Information (Detail) - USD ($)	4 Months Ended
	Apr. 24, 2021	Apr. 18, 2020
Pension and Other Postretirement Benefits Disclosure [Line Items]
Voluntarily contributions made by an employer	$ 0
Plan No. 1
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined benefit plan assets, transferred		$ 6,400,000
Defined benefit plans non-cash settlement charge		116,200,000
Settlement loss	$ 0	111,900,000
Defined benefit plan obligation, curtailment loss		4,300,000
Voluntarily contributions made by an employer		$ 1,400,000