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Business Segment Information - Summary of Net Sales of Company Recognized at a Point in Time Versus Over Time (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 02, 2022
Apr. 03, 2021
Disaggregation of Revenue [Line Items]    
Total net sales $ 690,572 $ 608,545
Chemistry Consumables [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 125,618 118,974
Service [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 239,732 226,523
Net Sales Recognized at a Point in Time: [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 536,618 461,309
Net Sales Recognized at a Point in Time: [Member] | Instrument Systems [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 325,222 263,048
Net Sales Recognized at a Point in Time: [Member] | Chemistry Consumables [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 125,618 118,974
Net Sales Recognized at a Point in Time: [Member] | Service [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 85,778 79,287
Net Sales Recognized Over Time: [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 690,572 608,545
Net Sales Recognized Over Time: [Member] | Service [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales $ 153,954 $ 147,236