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Goodwill and Other Intangible Assets - Summary of Goodwill by Business Segment (Detail)
$ in Thousands
 9 Months Ended
Feb. 28, 2023
USD ($)
Goodwill [Line Items]  
Beginning Balance $ 142,704
Acquisitions 1,996,024 [1]
Impairment (1,300) [2]
Foreign currency translation and other (2,310)
Ending Balance 2,135,118
Food Safety  
Goodwill [Line Items]  
Beginning Balance 67,558
Acquisitions 1,989,270 [1]
Impairment (1,300) [2]
Foreign currency translation and other (1,984)
Ending Balance 2,053,544
Animal Safety  
Goodwill [Line Items]  
Beginning Balance 75,146
Acquisitions 6,754 [1]
Foreign currency translation and other (326)
Ending Balance $ 81,574
[1] Animal Safety acquisitions represents portion of 3M Food Safety transaction recorded at Neogen Australasia.
[2] Impairment during the nine months ended February 28, 2023 relates to discontinued product lines. The amount was determined based on a relative fair value basis of the product lines compared to the overall reporting unit