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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% |  |  |

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