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Funded Status of Local 1199 Pension Plan and Retiree Medical Plan (Detail) - USD ($)	Dec. 26, 2020	Dec. 28, 2019
Pension Benefit Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets at end of fiscal year		$ 3,946,000
Benefit obligation at end of fiscal year		6,680,000
Unfunded Status	$ 0	(2,734,000)
Retiree Medical Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation at end of fiscal year	1,077,000	888,000
Unfunded Status	$ (1,077,000)	$ (888,000)

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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