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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 29, 2025
Mar. 30, 2024
Revenues:    
Total net sales $ 661,705 $ 636,839
Costs and operating expenses:    
Selling and administrative expenses 174,881 174,536
Research and development expenses 46,622 44,595
Purchased intangibles amortization 11,712 11,834
Litigation provision 0 10,242
Total costs and operating expenses 509,960 502,993
Operating income 151,745 133,846
Other income, net 1,524 2,259
Interest expense (14,270) (25,520)
Interest income 3,889 4,271
Income before income taxes 142,888 114,856
Provision for income taxes 21,507 12,660
Net income $ 121,381 $ 102,196
Net income per basic common share $ 2.04 $ 1.73
Weighted-average number of basic common shares 59,439 59,232
Net income per diluted common share $ 2.03 $ 1.72
Weighted-average number of diluted common shares and equivalents 59,711 59,431
Product [Member]    
Revenues:    
Total net sales $ 400,530 $ 376,151
Costs and operating expenses:    
Costs and operating expenses 168,559 153,182
Service [Member]    
Revenues:    
Total net sales 261,175 260,688
Costs and operating expenses:    
Costs and operating expenses $ 108,186 $ 108,604