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Employee Retirement Plans - Additional Information (Detail) - USD ($) $ in Millions	Apr. 30, 2019	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		$ 3.9
Benefit obligation at end of fiscal year		$ 6.7
Union Number 1199 Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Estimated cost of termination of retirement pension plan	$ 2.3

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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