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Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Income Statement [Abstract]
Net sales	$ 39,000	$ 39,722	$ 75,423	$ 79,058
Cost of products sold	32,605	33,406	63,147	65,796
Gross profit	6,395	6,316	12,276	13,262
Operating expenses	6,406	6,355	12,563	12,525
Operating earnings (loss)	(11)	(39)	(287)	737
Pension expense	(289)	(113)	(577)	(226)
Other income	66	129	120	298
Interest expense	(128)	(135)	(205)	(302)
Earnings (loss) before income taxes	(362)	(158)	(949)	507
Income tax expense (benefit)	(197)	2,003	(176)	2,172
Net loss	(165)	(2,161)	(773)	(1,665)
Less: net earnings attributable to the noncontrolling interest	15	17	5	42
Net loss attributable to Kewaunee Scientific Corporation	$ (180)	$ (2,178)	$ (778)	$ (1,707)
Net loss per share attributable to Kewaunee Scientific Corporation stockholders
Basic (in dollars per share)	$ (0.07)	$ (0.79)	$ (0.28)	$ (0.62)
Diluted (in dollars per share)	$ (0.07)	$ (0.79)	$ (0.28)	$ (0.62)
Weighted average number of common shares outstanding
Basic	2,759	2,750	2,757	2,750
Diluted	2,759	2,750	2,757	2,750

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1505-109256

+ Details

Name:	us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1448-109256

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

+ Details

Name:	us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration