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Revenue Recognition - Additional Information (Detail)	3 Months Ended
	Aug. 31, 2021
Revenue from Contract with Customer [Abstract]
Products and Services, Payment Terms	30 to 60 days

X

- Definition

Products and services, payment terms.

+ References

No definition available.

+ Details

Name:	neog_ProductsAndServicesPaymentTerms
Namespace Prefix:	neog_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration