XML 37 R23.htm IDEA: XBRL DOCUMENT v3.10.0.1

Accounting Policies - Additional Information (Detail) $ in Millions			3 Months Ended	6 Months Ended
	Dec. 29, 2017	Dec. 22, 2017	May 31, 2018 USD ($)	Nov. 30, 2018
Significant Accounting Policies [Line Items]
Stock split ratio	1.33
Federal corporate tax rate		35.00%		21.00%
Deferred tax benefit			$ 6.0
Deferred tax benefit, net			4.8
Current tax expense			$ 1.2
Minimum
Significant Accounting Policies [Line Items]
Marketable securities, maturity period				91 days
Finite lived intangible assets, useful life				5 years
Maximum
Significant Accounting Policies [Line Items]
Marketable securities, maturity period				1 year
Finite lived intangible assets, useful life				25 years

X

- Definition

Marketable Securities Contractual Maturity Period

+ References

No definition available.

+ Details

Name:	neog_MarketableSecuritiesContractualMaturityPeriod
Namespace Prefix:	neog_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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

Tax cuts and jobs act of 2017 change in tax rate deferred income tax expense benefit.

+ References

No definition available.

+ Details

Name:	neog_TaxCutsAndJobsActOf2017ChangeInTaxRateDeferredIncomeTaxExpenseBenefit
Namespace Prefix:	neog_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Tax Cuts and Jobs Act of 2017 change in tax rate deferred income tax expense benefit net.

+ References

No definition available.

+ Details

Name:	neog_TaxCutsAndJobsActOf2017ChangeInTaxRateDeferredIncomeTaxExpenseBenefitNet
Namespace Prefix:	neog_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Tax cuts and jobs act of 2017 change in tax rate repatriation of foreign earning.

+ References

No definition available.

+ Details

Name:	neog_TaxCutsAndJobsActOf2017ChangeInTaxRateRepatriationOfForeignEarning
Namespace Prefix:	neog_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I)
-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

+ Details

Name:	us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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

- Definition

Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770

+ Details

Name:	us-gaap_StockholdersEquityNoteStockSplitConversionRatio1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
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: