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Pension and Other Postretirement Plans - Additional Information (Detail) - Pension Plans - USD ($) $ in Thousands	Jul. 31, 2021	Apr. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Expected future employer contributions, current fiscal year	$ 98,000
Expected future employer contributions, additional cash contribution	$ 50,000	$ 50,000

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- Definition

Defined Benefit Plan, Expected Future Employer Contributions, Additional Cash Contribution

+ References

No definition available.

+ Details

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Namespace Prefix:	ndsn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

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- Definition

Amount of contributions received and expected to be received by defined benefit plan from employer in current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

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Namespace Prefix:
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Balance Type:
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