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Business Combinations - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 28, 2023 | Nov. 30, 2022 | Sep. 30, 2022 | Jul. 31, 2022 | Aug. 31, 2025 | May 31, 2025 | May 31, 2024 | May 31, 2023 | Feb. 28, 2025 | Oct. 31, 2023
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Adjustments to intangible assets |  |  |  |  | $ 100 |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  |  | $ 0 | $ 0 | $ (11,721) |  |
Maximum potential Payments | $ 8,500 |  |  |  |  |  |  |  |  |
Other non-current liabilities | 930 |  |  |  |  |  |  |  | $ 930 |
Stock Issued During Period, Value, Acquisitions |  |  |  |  |  |  |  | 2,262,841 |  |
Goodwill |  |  |  |  |  | 1,064,902 | 2,135,632 | 2,137,496 |  |
Operating Income (Loss) |  |  |  |  |  | (1,060,997) | 58,663 | 37,515 |  |
Amortization expense for intangible assets |  |  |  |  |  | $ 93,917 | $ 94,946 | 71,085 |  |
Thaineo Biotech Co Ltd |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Cash consideration for purchase of business |  | $ 37 |  | $ 1,310 |  |  |  |  |  |
Purchase price allocation for intangible assets |  |  |  | $ 620 |  |  |  |  |  |
Useful Life in Years |  |  |  | 10 years |  |  |  |  |  |
Business combination, consideration transferred |  |  |  | $ 1,581 |  |  |  |  |  |
Cash payable to former owner for purchase of business |  |  |  |  |  |  |  |  |  | $ 234
Corvium Inc |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business combination, consideration transferred | 24,067 |  |  |  |  |  |  |  |  |
Cash held in escrow | 9,004 |  |  |  |  |  |  |  |  |
Escrow balance released | $ 8,000 |  |  |  |  |  |  |  |  |
3M Food Safety Transaction |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business combination, consideration transferred |  |  | $ 3,200,000 |  |  |  |  |  |  |
Number of shares issued in business acquisitions |  |  | 108,269,946 |  |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions |  |  | $ 2,200,000 |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  | 919,959 |  |
Operating Income (Loss) |  |  |  |  |  |  |  | $ 44,373 |  |
3M Food Safety Transaction | Garden Spinco |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Non-cash consideration by additional financing |  |  | $ 1,000,000 |  |  |  |  |  |  |
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 | Garden Spinco |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Minority interest ownership percentage by Parent |  |  | 50.10% |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Useful Life in Years |  |  |  |  |  | 2 years |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Useful Life in Years |  |  |  |  |  | 25 years |  |  |  |

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