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		9 Months Ended
	Oct. 01, 2022	Oct. 02, 2021	Oct. 01, 2022	Oct. 02, 2021
Disaggregation of Revenue [Line Items]
Total net sales	$ 708,555	$ 659,233	$ 2,113,446	$ 1,949,425
Chemistry Consumables [Member]
Disaggregation of Revenue [Line Items]
Total net sales	128,096	123,045	385,661	368,478
Service [Member]
Disaggregation of Revenue [Line Items]
Total net sales	243,632	240,100	728,053	707,315
Net Sales Recognized at a Point in Time: [Member]
Disaggregation of Revenue [Line Items]
Total net sales	554,647	504,226	1,652,467	1,495,322
Net Sales Recognized at a Point in Time: [Member] | Instrument Systems [Member]
Disaggregation of Revenue [Line Items]
Total net sales	336,827	296,088	999,732	873,632
Net Sales Recognized at a Point in Time: [Member] | Chemistry Consumables [Member]
Disaggregation of Revenue [Line Items]
Total net sales	128,096	123,045	385,661	368,478
Net Sales Recognized at a Point in Time: [Member] | Service [Member]
Disaggregation of Revenue [Line Items]
Total net sales	89,724	85,093	267,074	253,212
Net Sales Recognized Over Time: [Member]
Disaggregation of Revenue [Line Items]
Total net sales	708,555	659,233	2,113,446	1,949,425
Net Sales Recognized Over Time: [Member] | Service [Member]
Disaggregation of Revenue [Line Items]
Total net sales	$ 153,908	$ 155,007	$ 460,979	$ 454,103