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Accounting Policies - Additional Information (Detail)	3 Months Ended
	Aug. 31, 2020
Minimum
Significant Accounting Policies [Line Items]
Finite lived intangible assets, useful life	5 years
Maximum
Significant Accounting Policies [Line Items]
Finite lived intangible assets, useful life	25 years

X

- Definition

Significant Accounting Policies [Line Items]

+ References

No definition available.

+ Details

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

X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: