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Business Combinations - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Feb. 10, 2023
Nov. 29, 2022
Sep. 01, 2022
Jul. 01, 2022
Dec. 09, 2021
Nov. 30, 2021
Sep. 17, 2021
Feb. 28, 2023
Nov. 30, 2022
Feb. 28, 2022
Feb. 28, 2023
Feb. 28, 2022
May 31, 2022
Business Acquisition [Line Items]                          
Cash consideration for purchase of business   $ 37,000   $ 1,310,000                  
Purchase price allocation for accounts receivable       177,000                  
Purchase price allocation for inventory       232,000                  
Purchase price allocation for land, property and equipment       16,000                  
Purchase price allocation for intangible assets       620,000                  
Purchase price allocation for accounts payable       98,000                  
Purchase price allocation for deferred tax liability       124,000                  
Purchase price allocation for other current liabilities       6,000                  
Purchase price allocation for other non-current assets       6,000                  
Loss on sale of minority interest                     $ 1,516,000 $ 0  
Cash payable to former owner for purchase of business       234,000                  
Purchase price allocation for Prepaid Expenses       3,000                  
Payments to Acquire Businesses, Net of Cash Acquired                     (13,237,000) 38,164,000  
Maximum potential Payments             $ 6,500,000            
Royalty Expense             14,500,000            
Performance milestone liability               $ 300,000,000     300,000,000    
Stock Issued During Period, Value, Acquisitions                 $ 2,262,841,000        
Goodwill               2,135,118,000     2,135,118,000   $ 142,704,000
Operating Income (Loss)               15,684,000   $ 6,377,000 14,090,000 40,591,000  
Amortization expense for acquired intangible assets               22,900,000   2,600,000 48,000,000.0 7,300,000  
CAPInnoVet, Inc [Member]                          
Business Acquisition [Line Items]                          
Payments to Acquire Businesses, Net of Cash Acquired             $ 17,900,000            
Delf (UK) Ltd [Member]                          
Business Acquisition [Line Items]                          
Cash consideration for purchase of business           $ 9,500,000              
Genetic Veterinary Services, Inc [Member]                          
Business Acquisition [Line Items]                          
Payments to Acquire Businesses, Net of Cash Acquired         $ 11,300,000                
Thaineo Biotech Co Ltd                          
Business Acquisition [Line Items]                          
Consideration for purchase of business       $ 1,581,000                  
Three M Food Safety Transaction [Member]                          
Business Acquisition [Line Items]                          
Cash consideration for purchase of business     $ 1,000,000,000                    
Purchase price allocation for inventory               18,403,000     18,403,000    
Purchase price allocation for land, property and equipment               25,721,000     25,721,000    
Purchase price allocation for intangible assets               1,560,000,000     1,560,000,000    
Purchase price allocation for deferred tax liability               355,347,000     355,347,000    
Consideration for purchase of business     3,200,000,000                    
Business Combination Consideration Transferred Other1     $ 3,200,000,000                    
Number of shares issued in business acquisitions     108,269,946                    
Stock Issued During Period, Value, Acquisitions     $ 2,200,000,000                    
Goodwill               1,978,149,000     1,978,149,000    
Business acquisition, goodwill, not deductible for tax purposes               1,920,000,000     1,920,000,000    
Business Combination, Acquisition Related Costs               2,800,000          
Revenues               218,300,000   219,900,000 675,600,000 668,100,000  
Operating Income (Loss)               15,700,000   (17,000,000) (5,400,000) (10,900,000)  
Amortization expense for acquired intangible assets               20,300,000          
Cost of goods sold               614,000          
Three M Food Safety Transaction [Member] | Accounts Receivable Prepaid expenses and other current assets [Member]                          
Business Acquisition [Line Items]                          
Accounts receivable               42,900,000     42,900,000    
Three M Food Safety Transaction [Member] | General and Administrative Expense [Member]                          
Business Acquisition [Line Items]                          
Acquisition related fees and integration expenses               2,800,000   $ 10,600,000 $ 55,600,000 $ 19,900,000  
Corvium Inc [Member]                          
Business Acquisition [Line Items]                          
Purchase price allocation for land, property and equipment $ 13,000                        
Purchase price allocation for intangible assets 14,000,000                        
Consideration for purchase of business 24,100,000                        
Loss on sale of minority interest               1,500,000          
Unearned revenue liability 1,827,000                        
Purchase price allocation for Prepaid Expenses 101,000                        
Goodwill $ 14,199,000                        
3M FSD [Member]                          
Business Acquisition [Line Items]                          
Revenues               87,000,000.0          
Operating Income (Loss)               $ 3,300,000          
Minimum                          
Business Acquisition [Line Items]                          
Finite lived intangible assets, useful life                     5 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 Parent     50.10%                    
Minority interest ownership percentage by Noncontrolling owners     49.90%