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Business Combinations - Additional Information (Detail) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended
Feb. 10, 2023
Sep. 01, 2022
Jul. 01, 2022
Nov. 30, 2022
Aug. 31, 2023
Aug. 31, 2022
May 31, 2023
Business Acquisition [Line Items]              
Cash consideration for purchase of business     $ 1,310 $ 37      
Purchase price allocation for accounts receivable     177        
Purchase price allocation for inventory     232        
Purchase price allocation for land, property and equipment     16        
Purchase price allocation for intangible assets     620        
Purchase price allocation for accounts payable     98        
Purchase price allocation for deferred tax liability     124        
Purchase price allocation for other current liabilities     6        
Purchase price allocation for other non-current assets     6        
Cash payable to former owner for purchase of business     234        
Purchase price allocation for Prepaid Expenses     3        
Payments to Acquire Businesses, Net of Cash Acquired         $ (0) $ 1,331  
Maximum potential Payments $ 8,500            
Other non-current liabilities (930)            
Adjustments to intangible assets         100    
Goodwill         2,137,602   $ 2,137,496
Operating Income (Loss)         19,135 6,062  
Amortization expense for acquired intangible assets         23,704 2,382  
Thaineo Biotech Co Ltd              
Business Acquisition [Line Items]              
Consideration for purchase of business     $ 1,581        
Three M Food Safety Transaction [Member]              
Business Acquisition [Line Items]              
Cash consideration for purchase of business   $ 1,000,000          
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)          
Business Combination Consideration Transferred Other1   $ 3,200,000          
Number of shares issued in business acquisitions   108,269,946          
Stock Issued During Period, Value, Acquisitions   $ 2,200,000          
Goodwill   $ 1,974,870     1,970,000    
Business acquisition, goodwill, not deductible for tax purposes         1,920,000    
Business Combination, Acquisition Related Costs         1,661    
Revenues         228,987 229,861  
Operating Income (Loss)         19,135 11,093  
Amortization expense for acquired intangible assets         20,314    
Three M Food Safety Transaction [Member] | Accounts Receivable Prepaid expenses and other current assets [Member]              
Business Acquisition [Line Items]              
Accounts receivable         24,925   $ 12,365
Three M Food Safety Transaction [Member] | General and Administrative Expense [Member]              
Business Acquisition [Line Items]              
Acquisition related fees and integration expenses         1,661,000 $ 13,732,000  
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            
3M FSD [Member]              
Business Acquisition [Line Items]              
Revenues         98,049    
Operating Income (Loss)         $ 12,000    
Minimum              
Business Acquisition [Line Items]              
Finite lived intangible assets, useful life         2 years    
Maximum              
Business Acquisition [Line Items]              
Finite lived intangible assets, useful life         25 years    
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%