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v3.20.4

Accounting Policies - Additional Information (Detail) | 6 Months Ended
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Nov. 30, 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: |