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Business Combinations - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 01, 2023
Feb. 10, 2023
Nov. 29, 2022
Sep. 01, 2022
Jul. 01, 2022
Dec. 13, 2021
Nov. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Jul. 31, 2020
May 31, 2023
May 31, 2023
May 31, 2022
May 31, 2021
Feb. 28, 2023
Dec. 31, 2021
Business Acquisition [Line Items]                                
Cash consideration for purchase of business     $ 37   $ 1,310                      
Purchase price allocation for intangible assets         620                      
Adjustments to intangible assets                     $ 3,820          
Adjustments to contingent liability                     1,070          
Cash payable to former owner for purchase of business         234       $ 8,600              
Payments to Acquire Businesses, Net of Cash Acquired                       $ (11,721) $ 38,745 $ 50,771    
Maximum potential Payments   $ 8,500           $ 6,500                
Maximum future royalty payments               14,500                
Performance milestone liability                             $ 300  
Other non-current liabilities   930                            
Stock Issued During Period, Value, Acquisitions                       2,262,841   4,916    
Goodwill                     2,137,496 2,137,496 142,704 131,476    
Operating income (loss)                       37,515 58,618 74,169    
Amortization expense for intangible assets                       71,085 9,600 $ 7,753    
Beef Cattle and Related Assets                                
Business Acquisition [Line Items]                                
Cash consideration for purchase of business                   $ 2,351            
Purchase price allocation for inventory                   51            
Purchase price allocation for intangible assets                   $ 2,300            
Megazyme Ltd and Subsidiary Megazyme Inc                                
Business Acquisition [Line Items]                                
Cash consideration for purchase of business                       2,349        
Contingent consideration potential payment                 2,500              
Purchase price allocation for accounts receivable                 1,376              
Purchase price allocation for inventory                 5,595              
Purchase price allocation for land, property and equipment                 12,599              
Purchase price allocation for Prepaid Expenses                 69              
Purchase price allocation for other current liabilities                 1,815              
Allocation of purchase price for contingent consideration potential payment                 2,458              
Purchase price allocation for long-term liabilities                 319              
Purchase price allocation for deferred tax liability                 3,306              
Purchase price allocation for intangible assets                 22,945              
Business acquisition Value of equity interest issued                 4,900              
Payments to Acquire Businesses, Net of Cash Acquired                 $ 39,800              
CAPInnoVet, Inc                                
Business Acquisition [Line Items]                                
Purchase price allocation for accounts receivable               308                
Purchase price allocation for inventory               531                
Purchase price allocation for Prepaid Expenses               296                
Purchase price allocation for other current liabilities               84                
Purchase price allocation for long-term liabilities               6,500                
Purchase price allocation for intangible assets               19,200                
Purchase price allocation for accounts payable               120                
Payments to Acquire Businesses, Net of Cash Acquired               $ 17,900                
Delf (UK) Ltd                                
Business Acquisition [Line Items]                                
Cash consideration for purchase of business             $ 9,500                  
Purchase price allocation for accounts receivable             1,059                  
Purchase price allocation for inventory             972                  
Purchase price allocation for land, property and equipment             152                  
Purchase price allocation for Prepaid Expenses             31                  
Purchase price allocation for other current liabilities             378                  
Purchase price allocation for deferred tax liability             780                  
Purchase price allocation for intangible assets             3,100                  
Purchase price allocation for accounts payable             $ 497                  
Genetic Veterinary Services, Inc                                
Business Acquisition [Line Items]                                
Purchase price allocation for accounts receivable                               $ 38
Purchase price allocation for inventory                               292
Purchase price allocation for land, property and equipment                               399
Purchase price allocation for Prepaid Expenses                               54
Purchase price allocation for other current liabilities                               321
Unearned revenue liability                               1,900
Purchase price allocation for intangible assets                               5,500
Purchase price allocation for accounts payable                               $ 325
Payments to Acquire Businesses, Net of Cash Acquired           $ 11,300                    
Thaineo Biotech Co Ltd                                
Business Acquisition [Line Items]                                
Business combination, consideration transferred         $ 1,581                      
Corvium Inc                                
Business Acquisition [Line Items]                                
Purchase price allocation for land, property and equipment   13                            
Purchase price allocation for Prepaid Expenses   66                            
Unearned revenue liability   1,827                            
Purchase price allocation for intangible assets   10,180                            
Business combination, consideration transferred   24,067                            
Cash held in escrow   9,004                            
Other non-current liabilities   930                            
Loss on sale of minority interest                       1,500        
Goodwill   $ 16,984                            
3M Food Safety Transaction                                
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 deferred tax liability       352,481                        
Purchase price allocation for intangible assets       1,560,000                        
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                        
Goodwill       1,974,520             1,970,000 1,970,000        
Business acquisition, goodwill, not deductible for tax purposes                     1,920,000 1,920,000        
Revenues                       919,959 910,978      
Operating income (loss)                       44,373 42,258      
Business Combination, Acquisition Related Costs                       58,175        
Amortization expense for intangible assets                       60,872        
Cost of goods sold                       3,245        
BusinessCombinationConsiderationTransferredOther1       $ 3,200,000                        
3M Food Safety Transaction | Accounts Receivable Prepaid expenses and other current assets [Member]                                
Business Acquisition [Line Items]                                
Accounts receivable                     $ 12,365 12,365        
3M Food Safety Transaction | General and Administrative Expense                                
Business Acquisition [Line Items]                                
Acquisition related fees and integration costs                       58,175 $ 25,581      
3M Food Safety Transaction | Postmerger Neogen Corp | PreMerger Neogen Shareholders                                
Business Acquisition [Line Items]                                
Minority interest ownership percentage by Noncontrolling owners       49.90%                        
3M Food Safety Transaction | Postmerger Neogen Corp | Neogen Food Safety Corporation                                
Business Acquisition [Line Items]                                
Minority interest ownership percentage by Parent       50.10%                        
3M FSD                                
Business Acquisition [Line Items]                                
Revenues                       279,541        
Operating income (loss)                       $ 28,200        
Subsequent Event [Member] | Corvium Inc                                
Business Acquisition [Line Items]                                
Escrow balance released $ 8,000