Goodwill and Other Intangible Assets - Goodwill by Business Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2024	May 31, 2023
Goodwill [Line Items]
Beginning Balance	$ 2,137,496	$ 142,704
Acquisitions	250	1,992,259
Foreign currency translation and other	(2,114)	2,533
Ending Balance	2,135,632	2,137,496
Food Safety
Goodwill [Line Items]
Beginning Balance	2,056,161	67,558
Acquisitions	250	1,985,476
Foreign currency translation and other	(2,206)	3,127
Ending Balance	2,054,205	2,056,161
Animal Safety
Goodwill [Line Items]
Beginning Balance	81,335	75,146
Acquisitions		6,783
Foreign currency translation and other	92	(594)
Ending Balance	$ 81,427	$ 81,335