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Other Comprehensive Income - Schedule of Components of Comprehensive Income (Loss) (Details) $ in Thousands, £ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Apr. 06, 2020 USD ($) | Apr. 06, 2020 GBP (£) | Sep. 26, 2020 USD ($) | Jun. 27, 2020 USD ($) | Mar. 28, 2020 USD ($) | Sep. 28, 2019 USD ($) | Jun. 29, 2019 USD ($) | Mar. 30, 2019 USD ($) | Sep. 26, 2020 USD ($) | Sep. 28, 2019 USD ($)
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |
Pre-tax |  |  | $ 16,691 |  |  | $ (17,008) |  |  | $ (2,970) | $ (14,655)
Tax |  |  | (290) |  |  | 18 |  |  | (2,555) | 29
Total change in other comprehensive income (loss) |  |  | 16,981 | $ (2,417) | $ (14,979) | (17,026) | $ (5,731) | $ 8,073 | (415) | (14,684)
Benefit obligation, unamortized actuarial loss | $ 13,400 |  |  |  |  |  |  |  |  |
Pension and postretirement liability and reclassification adjustments |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |
Pre-tax |  |  | 273 |  |  | 155 |  |  | (12,270) | 278
Tax |  |  | (290) |  |  | 18 |  |  | (2,555) | 29
Total change in other comprehensive income (loss) |  |  | 563 |  |  | 137 |  |  | (9,715) | 249
Benefit obligation, unamortized actuarial loss | £ |  | £ 10.9 |  |  |  |  |  |  |  |
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |
Pre-tax |  |  | 16,418 |  |  | (17,163) |  |  | 9,300 | (14,933)
Tax |  |  | 0 |  |  | 0 |  |  | 0 | 0
Total change in other comprehensive income (loss) |  |  | $ 16,418 |  |  | $ (17,163) |  |  | $ 9,300 | $ (14,933)

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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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