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Segment Information and Geographic Data - Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Aug. 31, 2025
Aug. 31, 2024
May 31, 2025
Segment Reporting Information [Line Items]      
Operating Expenses $ 111,061 $ 102,669  
Operating Income (Loss) (16,091) 2,257  
Depreciation and Amortization 29,055 29,800  
Interest Expense 16,442 18,615  
Total Assets 3,378,156   $ 3,443,836
Intersegment Revenue      
Segment Reporting Information [Line Items]      
Total Revenues (8,128) (6,629)  
Intersegment Revenue | Food Safety      
Segment Reporting Information [Line Items]      
Total Revenues (6,406) (4,230)  
Intersegment Revenue | Animal Safety      
Segment Reporting Information [Line Items]      
Total Revenues (1,722) (2,399)  
Operating Segments      
Segment Reporting Information [Line Items]      
Total Revenues 217,317 223,593  
Net Revenue 209,189 216,964  
Total Cost of Revenues 114,219 112,038  
Operating Expenses 111,061 102,669  
Operating Income (Loss) (16,091) 2,257  
Depreciation and Amortization 29,055 29,800  
Interest Expense 16,442 18,615  
Total Assets 3,378,156 4,503,173  
Expenditures for long-lived assets 24,002 38,433  
Operating Segments | Food Safety      
Segment Reporting Information [Line Items]      
Total Revenues 158,456 163,575  
Net Revenue 152,050 159,345  
Total Cost of Revenues 76,460 74,458  
Operating Expenses 68,499 66,982  
Operating Income (Loss) 7,091 17,905  
Depreciation and Amortization 25,901 26,202  
Interest Expense 0 0  
Total Assets 2,947,343 4,056,444  
Expenditures for long-lived assets 23,437 36,045  
Operating Segments | Animal Safety      
Segment Reporting Information [Line Items]      
Total Revenues 58,861 60,018  
Net Revenue 57,139 57,619  
Total Cost of Revenues 37,759 37,580  
Operating Expenses 14,908 17,450  
Operating Income (Loss) 4,472 2,589  
Depreciation and Amortization 3,154 3,598  
Interest Expense 0 0  
Total Assets 291,929 342,077  
Expenditures for long-lived assets 565 2,388  
Corporate and Eliminations | Intersegment Revenue      
Segment Reporting Information [Line Items]      
Total Revenues [1] 0 0  
Corporate and Eliminations | Operating Segments      
Segment Reporting Information [Line Items]      
Total Revenues [1] 0 0  
Net Revenue [1] 0 0  
Total Cost of Revenues [1] 0 0  
Operating Expenses [1] 27,654 18,237  
Operating Income (Loss) [1] (27,654) (18,237)  
Depreciation and Amortization [1] 0 0  
Interest Expense [1] 16,442 18,615  
Total Assets [1] 138,884 104,652  
Expenditures for long-lived assets [1] $ 0 $ 0  
[1] Includes corporate assets, including cash and cash equivalents, current and deferred tax accounts and overhead expenses not allocated to specific business segments, and excludes intersegment transactions.