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Revenue Recognition - Summary of Disaggregated Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2023	Feb. 28, 2022	Feb. 28, 2023	Feb. 28, 2022
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 218,255	$ 128,244	$ 580,637	$ 387,066
Food Safety
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	151,542	62,756	377,528	192,610
Food Safety | Natural Toxins, Allergens & Drug Residues
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	19,198	17,965	61,236	59,397
Food Safety | Bacterial & General Sanitation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	39,444	11,288	91,293	34,709
Food Safety | Culture Media & Other
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	77,955	18,145	179,293	56,136
Food Safety | Rodent Control, Insect Control & Disinfectants
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	9,550	9,577	29,502	25,459
Food Safety | Genomics Services
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	5,395	5,781	16,204	16,909
Animal Safety
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	66,713	65,488	203,109	194,456
Animal Safety | Rodent Control, Insect Control & Disinfectants
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	20,242	18,359	63,121	58,777
Animal Safety | Genomics Services
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	20,868	19,294	59,168	54,195
Animal Safety | Life Sciences
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,440	1,339	4,456	4,011
Animal Safety | Veterinary Instruments & Disposables
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	15,428	17,047	46,534	47,956
Animal Safety | Animal Care & Other
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 8,735	$ 9,449	$ 29,830	$ 29,517

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
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