Revenue Recognition - Summary of Disaggregated Revenue (Detail) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2026	Aug. 31, 2025
Disaggregation of Revenue [Line Items]
Total Revenues	$ 222.8	$ 209.2
Food Safety
Disaggregation of Revenue [Line Items]
Total Revenues	163.2	152.1
Food Safety \| Natural Toxins & Allergens
Disaggregation of Revenue [Line Items]
Total Revenues	19.3	20.0
Food Safety \| Bacterial & General Sanitation
Disaggregation of Revenue [Line Items]
Total Revenues	44.6	41.6
Food Safety \| Indicator Testing & Culture Media
Disaggregation of Revenue [Line Items]
Total Revenues	85.6	76.8
Food Safety \| Biosecurity Products
Disaggregation of Revenue [Line Items]
Total Revenues	4.6	5.8
Food Safety \| Genomics Services
Disaggregation of Revenue [Line Items]
Total Revenues	6.7	5.6
Food Safety \| Other
Disaggregation of Revenue [Line Items]
Total Revenues	2.4	2.3
Animal Safety
Disaggregation of Revenue [Line Items]
Total Revenues	59.6	57.1
Animal Safety \| Biosecurity Products
Disaggregation of Revenue [Line Items]
Total Revenues	18.9	19.2
Animal Safety \| Genomics Services
Disaggregation of Revenue [Line Items]
Total Revenues	17.3	16.5
Animal Safety \| Life Sciences
Disaggregation of Revenue [Line Items]
Total Revenues	1.6	1.9
Animal Safety \| Veterinary Instruments & Consumables
Disaggregation of Revenue [Line Items]
Total Revenues	14.1	11.9
Animal Safety \| Animal Care & Other
Disaggregation of Revenue [Line Items]
Total Revenues	$ 7.7	$ 7.6