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Business Segment Information - Summary of Net Sales by Customer Class (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Jun. 27, 2020
Jun. 29, 2019
Revenue, Major Customer [Line Items]        
Total net sales $ 519,984 $ 599,162 $ 984,923 $ 1,113,024
Pharmaceutical [Member]        
Revenue, Major Customer [Line Items]        
Total net sales 311,018 350,145 583,581 644,657
Industrial [Member]        
Revenue, Major Customer [Line Items]        
Total net sales 152,110 176,109 295,464 331,327
Academic and governmental [Member]        
Revenue, Major Customer [Line Items]        
Total net sales $ 56,856 $ 72,908 $ 105,878 $ 137,040