Benefit Plans - Weighted Average Expected Long-Term Rate of Return (Parenthetical) (Detail)	12 Months Ended
	Dec. 29, 2019
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return of plan assets	5.50%	[1]
Primary Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return of plan assets	5.50%
Bargaining Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return of plan assets	6.25%

[1] The weighted average expected long-term rate of return of plan assets is 5.50% for the Primary Plan and 6.25% for the Bargaining Plan.