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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. 28, 2019 | Sep. 29, 2018 | Sep. 28, 2019 | Sep. 29, 2018
Revenue, Major Customer [Line Items] |  |  |  |
Total net sales | $ 577,278 | $ 578,021 | $ 1,690,302 | $ 1,704,910
Pharmaceutical [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Total net sales | 328,227 | 325,166 | 972,884 | 968,848
Industrial [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Total net sales | 171,352 | 171,985 | 502,679 | 517,979
Academic and governmental [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Total net sales | $ 77,699 | $ 80,870 | $ 214,739 | $ 218,083

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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