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Business Segment Information - Summary of Net Sales by Customer Class (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Revenue, Major Customer [Line Items]
Total net sales	$ 593,784	$ 577,278	$ 1,578,707	$ 1,690,302
Pharmaceutical [Member]
Revenue, Major Customer [Line Items]
Total net sales	343,001	328,227	926,582	972,884
Industrial [Member]
Revenue, Major Customer [Line Items]
Total net sales	179,128	171,352	474,592	502,679
Academic and governmental [Member]
Revenue, Major Customer [Line Items]
Total net sales	$ 71,655	$ 77,699	$ 177,533	$ 214,739

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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