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Schedule of Net Periodic Pension and Postretirement (income) Cost (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 28, 2020 | Jun. 30, 2019 | Jun. 28, 2020 | Jun. 30, 2019
Defined Benefit Plan Disclosure |  |  |  |
Net actuarial (gain) loss |  |  | $ (99) | $ 448
UNITED STATES |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Service cost | $ 433 | $ 399 | 866 | 804
Interest cost | 1,523 | 1,799 | 3,045 | 3,595
Expected return on plan assets | (1,232) | (1,510) | (2,464) | (3,021)
Net actuarial (gain) loss | 180 | 252 | 180 | 252
Total net periodic pension (credit) cost | 904 | 940 | 1,627 | 1,630
Foreign Pension Plans, Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Service cost | 208 | 192 | 417 | 381
Interest cost | 119 | 176 | 238 | 349
Expected return on plan assets | (15) | (7) | (31) | (14)
Total net periodic pension (credit) cost | 312 | 361 | 624 | 716
Postretirement Benefit Plans |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Service cost | 17 | 11 | 28 | 20
Interest cost | 58 | 88 | 120 | 173
Amortization of prior service cost | (2) | (48) | (4) | (95)
Net actuarial (gain) loss | (279) | 196 | (279) | 196
Total net periodic pension (credit) cost | $ (206) | $ 247 | $ (135) | $ 294

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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