Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 27, 2020	Mar. 29, 2019	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Rollward]
Accumulated other comprehensive loss	$ (47,173)	$ (57,270)	$ (45,462)	$ (58,234)
Activity
Other comprehensive income (loss) before reclassifications	(2,616)	825
Amounts reclassified from accumulated other comprehensive income	614	530
Net current period other comprehensive income (loss) before tax	(2,002)	1,355
Deferred taxes on current period activity	(291)	391
Net current period other comprehensive (loss) income after tax	(1,711)	964
Pension and Post Employment Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Rollward]
Accumulated other comprehensive loss	(41,330)	(54,003)	(41,346)	(54,543)
Activity
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income	(24)	660
Net current period other comprehensive income (loss) before tax	(24)	660
Deferred taxes on current period activity	(40)	120
Net current period other comprehensive (loss) income after tax	16	540
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Rollward]
Accumulated other comprehensive loss	(5,886)	(5,095)	(5,013)	(4,592)
Activity
Other comprehensive income (loss) before reclassifications	(873)	(503)
Amounts reclassified from accumulated other comprehensive income	0	0
Net current period other comprehensive income (loss) before tax	(873)	(503)
Deferred taxes on current period activity	0	0
Net current period other comprehensive (loss) income after tax	(873)	(503)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Rollward]
Accumulated other comprehensive loss	43	1,828	897	901
Activity
Other comprehensive income (loss) before reclassifications	(1,743)	1,328
Amounts reclassified from accumulated other comprehensive income	638	(130)
Net current period other comprehensive income (loss) before tax	(1,105)	1,198
Deferred taxes on current period activity	(251)	271
Net current period other comprehensive (loss) income after tax	(854)	927
Foreign currency forward contract \| Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Rollward]
Accumulated other comprehensive loss	1,214	1,663	1,324	1,263
Activity
Other comprehensive income (loss) before reclassifications	(142)	517
Amounts reclassified from accumulated other comprehensive income	(1)	2
Net current period other comprehensive income (loss) before tax	(143)	519
Deferred taxes on current period activity	(33)	119
Net current period other comprehensive (loss) income after tax	(110)	400
Precious Metal Contracts [Member] \| Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Rollward]
Accumulated other comprehensive loss	(841)	(24)	(452)	79
Activity
Other comprehensive income (loss) before reclassifications	(823)	(73)
Amounts reclassified from accumulated other comprehensive income	318	(61)
Net current period other comprehensive income (loss) before tax	(505)	(134)
Deferred taxes on current period activity	(116)	(31)
Net current period other comprehensive (loss) income after tax	(389)	(103)
Copper swaps \| Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Rollward]
Accumulated other comprehensive loss	(330)	189	$ 25	$ (441)
Activity
Other comprehensive income (loss) before reclassifications	(778)	884
Amounts reclassified from accumulated other comprehensive income	321	(71)
Net current period other comprehensive income (loss) before tax	(457)	813
Deferred taxes on current period activity	(102)	183
Net current period other comprehensive (loss) income after tax	$ (355)	$ 630

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount before tax and reclassification adjustments of other comprehensive income (loss).

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Amount before tax, after reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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Amount before tax of reclassification adjustments of other comprehensive income (loss).

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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