Business Combinations - Additional Information (Detail) - USD ($) $ in Thousands				1 Months Ended	3 Months Ended				9 Months Ended
	Feb. 10, 2023	Sep. 01, 2022	Jul. 01, 2022	Nov. 30, 2022	Feb. 29, 2024	Aug. 31, 2023	Feb. 28, 2023	Nov. 30, 2022	Feb. 29, 2024	Feb. 28, 2023	Oct. 31, 2023	May 31, 2023
Business Acquisition [Line Items]
Cash consideration for purchase of business			$ 1,310	$ 37
Purchase price allocation for accounts receivable			177
Purchase price allocation for inventory			232
Purchase price allocation for land, property and equipment			16
Purchase price allocation for intangible assets			620
Purchase price allocation for accounts payable			98
Purchase price allocation for deferred tax liability			124
Purchase price allocation for other current liabilities			6
Purchase price allocation for other non-current assets			6
Cash paid to former owner for purchase of business											$ 234
Purchase price allocation for Prepaid Expenses			3
Payments to Acquire Businesses, Net of Cash Acquired									$ 0	$ (13,237)
Maximum potential Payments	$ 8,500
Other non-current liabilities	(930)
Adjustments to intangible assets						$ 100
Stock Issued During Period, Value, Acquisitions								$ 2,262,841
Goodwill					$ 2,136,338				2,136,338			$ 2,137,496
Operating Income (Loss)					12,023		$ 15,684		45,623	14,090
Amortization expense for acquired intangible assets					23,704		22,926		71,101	47,995
Thaineo Biotech Co Ltd
Business Acquisition [Line Items]
Consideration for purchase of business			$ 1,581
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				1,970,000
Business acquisition, goodwill, not deductible for tax purposes					1,920,000				1,920,000
Revenues					228,812		218,255		687,428	678,149
Operating Income (Loss)					12,023		$ 15,684		45,623	$ 19,121
Three M Food Safety Transaction [Member] | Accounts Receivable Prepaid expenses and other current assets [Member]
Business Acquisition [Line Items]
Accounts receivable					$ 461				$ 461			$ 12,365
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
Minimum
Business Acquisition [Line Items]
Finite lived intangible assets, useful life					2 years				2 years
Maximum
Business Acquisition [Line Items]
Finite lived intangible assets, useful life					25 years				25 years
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%