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Business Combinations - Additional Information (Detail) - USD ($) |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended |  |
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Nov. 29, 2022 | Sep. 01, 2022 | Jul. 01, 2022 | Dec. 09, 2021 | Nov. 30, 2021 | Sep. 17, 2021 | Nov. 30, 2023 | Nov. 30, 2022 | Nov. 30, 2021 | Nov. 30, 2022 | Nov. 30, 2021 | Sep. 21, 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 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  | $ (38,896,000) | $ 26,864,000 |  |
Maximum potential Payments |  |  |  |  |  | $ 6,500,000 |  |  |  |  |  |  |
Royalty Expense |  |  |  |  |  | 14,500,000 |  |  |  |  |  |  |
Escrow Deposit |  |  |  |  |  |  |  |  |  |  |  | $ 150,000 |
Fair value of common shares |  |  |  |  |  |  |  | $ 2,262,841,000 |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | 2,122,397,000 |  | 2,122,397,000 |  |  | $ 142,704,000
Operating Income (Loss) |  |  |  |  |  |  |  | (7,656,000) | $ 12,469,000 | (1,594,000) | 34,214,000 |  |
Amortization expense for acquired intangible assets |  |  |  |  |  |  |  | 22,700,000 | 2,400,000 | 25,100,000 | 4,600,000 |  |
CAPInnoVet, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for accounts receivable |  |  |  |  |  | 308,000 |  |  |  |  |  |  |
Purchase price allocation for inventory |  |  |  |  |  | 531,000 |  |  |  |  |  |  |
Purchase price allocation for intangible assets |  |  |  |  |  | 19,200,000 |  |  |  |  |  |  |
Purchase price allocation for accounts payable |  |  |  |  |  | 120,000 |  |  |  |  |  |  |
Purchase price allocation for other current liabilities |  |  |  |  |  | 84,000 |  |  |  |  |  |  |
Purchase price allocation for long-term liabilities |  |  |  |  |  | 6,500,000 |  |  |  |  |  |  |
Cash payable to former owner for purchase of business |  |  |  |  |  | 150,000 |  |  |  |  |  |  |
Purchase price allocation for Prepaid Expenses |  |  |  |  |  | 296,000 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Purchase price allocation for accounts receivable |  |  |  |  | 1,059,000 |  |  |  | 1,059,000 |  | 1,059,000 |  |
Purchase price allocation for inventory |  |  |  |  | 972,000 |  |  |  | 972,000 |  | 972,000 |  |
Purchase price allocation for land, property and equipment |  |  |  |  | 152,000 |  |  |  | 152,000 |  | 152,000 |  |
Purchase price allocation for intangible assets |  |  |  |  | 3,100,000 |  |  |  | 3,100,000 |  | 3,100,000 |  |
Purchase price allocation for accounts payable |  |  |  |  | 497,000 |  |  |  | 497,000 |  | 497,000 |  |
Purchase price allocation for deferred tax liability |  |  |  |  | 780,000 |  |  |  | 780,000 |  | 780,000 |  |
Purchase price allocation for current liabilities |  |  |  |  | 378,000 |  |  |  | 378,000 |  | 378,000 |  |
Cash payable to former owner for purchase of business |  |  |  |  | 722,000 |  |  |  | 722,000 |  | 722,000 |  |
Purchase price allocation for Prepaid Expenses |  |  |  |  | $ 31,000 |  |  |  | 31,000 |  | 31,000 |  |
Genetic Veterinary Services, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for accounts receivable |  |  |  | $ 38,000 |  |  |  |  |  |  |  |  |
Purchase price allocation for inventory |  |  |  | 292,000 |  |  |  |  |  |  |  |  |
Purchase price allocation for land, property and equipment |  |  |  | 399,000 |  |  |  |  |  |  |  |  |
Purchase price allocation for intangible assets |  |  |  | 5,500,000 |  |  |  |  |  |  |  |  |
Purchase price allocation for accounts payable |  |  |  | 325,000 |  |  |  |  |  |  |  |  |
Purchase price allocation for other current liabilities |  |  |  | 321,000 |  |  |  |  |  |  |  |  |
Unearned revenue liability |  |  |  | 1,900,000 |  |  |  |  |  |  |  |  |
Purchase price allocation for Prepaid Expenses |  |  |  | 54,000 |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  | $ 11,400,000 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  | 21,402,000 |  | 21,402,000 |  |  |
Purchase price allocation for land, property and equipment |  |  |  |  |  |  |  | 20,010,000 |  | 20,010,000 |  |  |
Purchase price allocation for intangible assets |  |  |  |  |  |  |  | 1,560,000,000 |  | 1,560,000,000 |  |  |
Purchase price allocation for deferred tax liability |  |  |  |  |  |  |  | 353,760,000 |  | 353,760,000 |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
Fair value of common shares |  | $ 2,300,000,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | 1,963,171,000 |  | 1,963,171,000 |  |  |
Business acquisition, goodwill, not deductible for tax purposes |  |  |  |  |  |  |  | 1,900,000,000 |  | 1,900,000,000 |  |  |
Revenues |  |  |  |  |  |  |  | 230,033,000 | 225,700,000 | 457,300,000 | 448,200,000 |  |
Operating Income (Loss) |  |  |  |  |  |  |  | (7,700,000) | $ (1,600,000) | (21,100,000) | $ 6,100,000 |  |
Three M Food Safety Transaction [Member] | Accounts Receivable Prepaid expenses and other current assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  |  | 36,500,000 |  | 36,500,000 |  |  |
Three M Food Safety Transaction [Member] | General and Administrative Expense [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  | 39,100,000 |  | $ 52,900,000 |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  |  | $ 9,300,000 |  |  |  |  |
Three M Food Safety Transaction [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  | $ 39,100,000 |  |  |  |  |  |
Revenues |  |  |  |  |  |  | 92,700,000 |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  | 29,700,000 |  |  |  |  |  |
Amortization expense for acquired intangible assets |  |  |  |  |  |  | 20,300,000 |  |  |  |  |  |
Cost of goods sold |  |  |  |  |  |  | $ 3,900,000 |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets, useful life |  |  |  |  |  |  |  |  |  | 5 years |  |  |
Minimum | CAPInnoVet, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets, useful life |  |  |  |  |  | 15 years |  |  |  |  |  |  |
Minimum | Delf (UK) Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets, useful life |  |  |  |  | 10 years |  |  |  |  |  |  |  |
Minimum | Genetic Veterinary Services, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |
Maximum | CAPInnoVet, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets, useful life |  |  |  |  |  | 20 years |  |  |  |  |  |  |
Maximum | Delf (UK) Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets, useful life |  |  |  |  | 15 years |  |  |  |  |  |  |  |
Maximum | Genetic Veterinary Services, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets, useful life |  |  |  | 15 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% |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=128092470&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=128092470&loc=d3e4845-128472 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=128092470&loc=d3e4845-128472 + Details
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