Business Combinations - Additional Information (Detail) - USD ($)							3 Months Ended			6 Months Ended
	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%