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Segment Information (Detail) - USD ($)
 12 Months Ended
Jan. 03, 2025
Dec. 29, 2023
Dec. 30, 2022
Segment Reporting Information [Line Items]      
Revenues $ 558,514,000 $ 536,766,000 $ 513,293,000
Compensation and related expenses 330,011,000 319,886,000 264,235,000
Operating Income 119,557,000 111,322,000 140,842,000
Capital Expenditures 7,377,000 18,695,000 12,647,000
Depreciation and Amortization 9,689,000 8,916,000 7,079,000
Operating segments      
Segment Reporting Information [Line Items]      
Compensation and related expenses 270,995,000 264,269,000 242,531,000
Operating Income 194,878,000 182,350,000 180,019,000
Capital Expenditures 3,334,000 4,065,000 4,835,000
Depreciation and Amortization 7,039,000 6,300,000 4,660,000
Corporate      
Segment Reporting Information [Line Items]      
Compensation and related expenses 59,016,000 55,617,000 21,704,000
Operating Income (75,321,000) (71,028,000) (39,177,000)
Capital Expenditures 4,043,000 14,630,000 7,812,000
Depreciation and Amortization 2,650,000 2,616,000 2,419,000
Engineering and Other Scientific | Operating segments      
Segment Reporting Information [Line Items]      
Revenues 469,544,000 446,888,000 427,796,000
Compensation and related expenses 223,395,000 215,650,000 195,243,000
Operating Income 164,883,000 153,918,000 152,679,000
Capital Expenditures 3,257,000 3,895,000 4,661,000
Depreciation and Amortization 6,833,000 6,087,000 4,489,000
Environmental and Health | Operating segments      
Segment Reporting Information [Line Items]      
Revenues 88,970,000 89,878,000 85,497,000
Compensation and related expenses 47,600,000 48,619,000 47,288,000
Operating Income 29,995,000 28,432,000 27,340,000
Capital Expenditures 77,000 170,000 174,000
Depreciation and Amortization $ 206,000 $ 213,000 $ 171,000