Local 1199 Plan's Weighted-Average Asset Allocations (Detail)	Dec. 26, 2020	Dec. 28, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan Weighted Average Asset Allocations	0.00%	100.00%
Cash Equivalents
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan Weighted Average Asset Allocations	0.00%	100.00%
Equity Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan Weighted Average Asset Allocations	0.00%	0.00%
Debt Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan Weighted Average Asset Allocations	0.00%	0.00%