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Discontinued Operations (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 28, 2025	Sep. 29, 2024	Sep. 28, 2025	Sep. 29, 2024	Dec. 29, 2024	Dec. 31, 2023	Mar. 13, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ (569)	$ 981	$ (1,275)	$ (18,948)
Analytical, Food and Enterprise Services businesses [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) Gain on Sale, before Income Tax	(300)	400	(600)	(25,100)	$ (25,400)	$ 811,500
Discontinued Operation, Tax Effect of Discontinued Operation	$ 200	$ (600)	$ 700	$ (6,100)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent					$ (12,700)	$ 513,600
Disposal Group, Consideration, Contingent on Exit Valuation							$ 150,000
Disposal Group, Consideration, Cash Proceeds at Closing							$ 2,270,000

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Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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