XML 42 R28.htm IDEA: XBRL DOCUMENT v3.19.2

Marketable Securities (Detail) - USD ($)	May 31, 2019	May 31, 2018
Marketable Securities, Current	$ 225,836,000	$ 127,736,000
US Treasury Securities | Maturing in 0 - 90 days
Marketable Securities, Current	2,470,000	19,910,000
US Treasury Securities | Maturing in 181 days - 1 year
Marketable Securities, Current	2,435,000
US Treasury Securities | Maturing in 1 - 2 years
Marketable Securities, Current	2,505,000
Commercial Paper | Maturing in 0 - 90 days
Marketable Securities, Current	84,338,000	47,740,000
Commercial Paper | Maturing in 91 - 180 days
Marketable Securities, Current	47,960,000	32,673,000
Commercial Paper | Maturing in 181 days - 1 year
Marketable Securities, Current	34,369,000
Commercial Paper | Maturing in 1 - 2 years
Marketable Securities, Current	34,078,000
Certificates of Deposit | Maturing in 0 - 90 days
Marketable Securities, Current	7,732,000	5,446,000
Certificates of Deposit | Maturing in 91 - 180 days
Marketable Securities, Current	5,000,000	8,747,000
Certificates of Deposit | Maturing in 181 days - 1 year
Marketable Securities, Current	750,000	$ 13,220,000
Certificates of Deposit | Maturing in 1 - 2 years
Marketable Securities, Current	$ 4,199,000

X

- Definition

Amount of investment in marketable security, classified as current.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_MarketableSecuritiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	neog_MaturityAxis=neog_MaturityInZeroToNinetyDaysMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	neog_MaturityAxis=neog_MaturityInOneHundredEightyOneToOneYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	neog_MaturityAxis=neog_MaturityInOneToTwoYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_CommercialPaperMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	neog_MaturityAxis=neog_MaturityInNinetyOneToOneHundredEightyDaysMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_CertificatesOfDepositMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: