Business Combinations - Additional Information (Detail) - USD ($) $ in Thousands				1 Months Ended	3 Months Ended			6 Months Ended
	Feb. 10, 2023	Sep. 01, 2022	Jul. 01, 2022	Nov. 30, 2022	Nov. 30, 2023	Aug. 31, 2023	Nov. 30, 2022	Nov. 30, 2023	Nov. 30, 2022	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)	$ (38,896)
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					$ 2,137,983			2,137,983			$ 2,137,496
Operating Income (Loss)					14,465		(7,656)	33,600	(1,594)
Amortization expense for acquired intangible assets					23,693		22,687	47,397	25,069
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]
Cash consideration for purchase of business		$ 1,000,000
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)
Business Combination Consideration Transferred Other1		$ 3,200,000
Number of shares issued in business acquisitions		108,269,946
Stock Issued During Period, Value, Acquisitions		$ 2,200,000
Goodwill		$ 1,974,870			1,970,000			1,970,000
Business acquisition, goodwill, not deductible for tax purposes					1,920,000			1,920,000
Business Combination, Acquisition Related Costs								4,585
Revenues					229,629		230,033	458,616	459,894
Operating Income (Loss)					14,465		(7,656)	33,600	3,437
Amortization expense for acquired intangible assets								20,120
Three M Food Safety Transaction [Member] | Accounts Receivable Prepaid expenses and other current assets [Member]
Business Acquisition [Line Items]
Accounts receivable					25,337			25,337			$ 12,365
Three M Food Safety Transaction [Member] | General and Administrative Expense [Member]
Business Acquisition [Line Items]
Acquisition related fees, integration expenses and professional fees					4,585		$ 39,132	$ 6,246	$ 52,864
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
3M FSD [Member]
Business Acquisition [Line Items]
Revenues					99,847
Operating Income (Loss)					$ 12,000
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
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%