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Business Combinations - Additional Information (Detail) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2023
Sep. 30, 2022
Aug. 31, 2024
Aug. 31, 2023
May 31, 2024
Business Acquisition [Line Items]          
Maximum potential Payments $ 8,500       $ 0
Other non-current liabilities (930)        
Adjustments to intangible assets     $ 100    
Goodwill     2,137,494   $ 2,135,632
Operating Income (Loss)     2,257 $ 19,135  
Three M Food Safety Transaction [Member]          
Business Acquisition [Line Items]          
Purchase price allocation for inventory   $ 18,403      
Purchase price allocation for land, property and equipment   25,832      
Purchase price allocation for intangible assets   1,559,805      
Purchase price allocation for deferred tax liability   352,636      
Other non-current liabilities   $ (2,832)      
Number of shares issued in business acquisitions   108,269,946      
Stock Issued During Period, Value, Acquisitions   $ 2,200,000      
Non-cash consideration   3,200,000      
Goodwill   1,974,870 1,970,000    
Business acquisition, goodwill, not deductible for tax purposes     1,920,000    
Corvium Inc [Member]          
Business Acquisition [Line Items]          
Purchase price allocation for land, property and equipment 13        
Purchase price allocation for intangible assets 10,280        
Consideration for purchase of business 24,067        
Unearned revenue liability 1,827        
Purchase price allocation for Prepaid Expenses 66        
Other non-current liabilities (930)        
Escrow Deposit 9,004        
Escrow balance released     $ 8,000    
Goodwill $ 16,884        
Garden SpinCo [Member] | Three M Food Safety Transaction [Member]          
Business Acquisition [Line Items]          
Non-cash consideration by additional financing   $ 1,000,000      
Postmerger Neogen Corp [Member] | Garden SpinCo [Member] | Three M Food Safety Transaction [Member]          
Business Acquisition [Line Items]          
Minority interest ownership percentage by Parent   50.10%      
Postmerger Neogen Corp [Member] | Premerger Neogen Shareholders [Member] | Three M Food Safety Transaction [Member]          
Business Acquisition [Line Items]          
Minority interest ownership percentage by Noncontrolling owners   49.90%