v3.25.2
Segment Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2025
May 31, 2024
May 31, 2023
Segment Reporting Information [Line Items]      
Total Revenues $ 894,661 $ 924,222 $ 822,447
Total Cost of Revenues 473,285 460,322 416,492
Gross Profit 421,376 463,900 405,955
Operating Expenses 1,482,373 405,237 368,440
Operating Income (Loss) (1,060,997) 58,663 37,515
Depreciation and Amortization 119,483 116,717 88,377
Interest Expense 71,622 73,394 55,961
Total Assets 3,443,836 4,548,833 4,554,432
Expenditures for long-lived assets 104,595 111,421 65,757
Operating Segments | Food Safety      
Segment Reporting Information [Line Items]      
Total Revenues 638,140 655,341 546,797
Total Cost of Revenues 308,715 301,634 257,655
Operating Expenses 1,315,095 271,261 228,728
Operating Income (Loss) (985,670) 82,446 60,414
Depreciation and Amortization 105,022 102,328 76,841
Interest Expense 0 0 0
Total Assets 2,991,767 4,035,257 3,970,356
Expenditures for long-lived assets 96,698 93,036 52,169
Operating Segments | Animal Safety      
Segment Reporting Information [Line Items]      
Total Revenues 256,521 268,881 275,650
Total Cost of Revenues 164,570 158,688 158,837
Operating Expenses 84,704 70,873 73,481
Operating Income (Loss) 7,247 39,320 43,332
Depreciation and Amortization 14,461 14,389 11,536
Interest Expense 0 0 0
Total Assets 323,065 342,640 338,507
Expenditures for long-lived assets 7,897 18,385 13,588
Corporate and Eliminations | Operating Segments      
Segment Reporting Information [Line Items]      
Operating Expenses [1] 82,574 63,103 66,231
Operating Income (Loss) [1] (82,574) (63,103) (66,231)
Depreciation and Amortization [1] 0 0 0
Interest Expense [1] 71,622 73,394 55,961
Total Assets [1] 129,004 170,936 245,569
Expenditures for long-lived assets [1] $ 0 $ 0 $ 0
[1] Includes corporate assets, including cash and cash equivalents, marketable securities, current and deferred tax accounts, and overhead expenses not allocated to specific business segments. Also includes the elimination of intersegment transactions.