Pension and Postretirement Benefit Obligations - Components of Net Periodic Postretirement Benefit Cost (Detail) - Postretirement Benefits - USD ($) $ in Thousands	3 Months Ended
Apr. 02, 2021	Mar. 29, 2020
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 403	$ 376
Interest cost	447	503
Recognized net actuarial loss	186	88
Net periodic pension/postretirement benefit cost	$ 1,036	$ 967

Amount of gain (loss), recognized immediately as component of net periodic benefit (cost) credit, for change in value of benefit obligation or plan assets from experience different from that assumed, change in actuarial assumption, or consequence of temporarily deviating from substantive plan. Includes, but is not limited to, amount in excess of ten percent of greater of fair value of plan assets or benefit obligation.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of cost recognized for passage of time related to defined benefit plan.

+ References

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-Publisher FASB
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- Definition

Amount of net periodic benefit cost (credit) for defined benefit plan.

+ References

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- Definition

Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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