Note 9 - Goodwill and Other Intangible Assets (Details Textual) $ in Millions		9 Months Ended
Mar. 01, 2026 USD ($)	Mar. 31, 2026
Number of Reporting Units	5	6
Display Solutions Segment [Member]
Number of Reporting Units		5
Display Solutions Segment [Member] \| First Reporting Unit [Member]
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount	$ 27.3
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	13.00%
Display Solutions Segment [Member] \| Second Reporting Unit [Member]
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount	$ 114.9
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	41.00%
Display Solutions Segment [Member] \| Third Reporting Unit [Member]
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount	$ 65.7
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	47.00%
Display Solutions Segment [Member] \| Fourth Reporting Unit [Member]
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount	$ 26.6
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	132.00%
Lighting Segment [Member]
Number of Reporting Units		1
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount	$ 34.0

Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

Name:	us-gaap_NumberOfReportingUnits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of fair value of reporting unit in excess of carrying amount.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 35
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482646/350-20-35-4

+ Details

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

- Definition

Percentage of fair value of reporting unit in excess of carrying amount.

+ References

+ Details

Name:	us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=lyts_DisplaySolutionsSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ReportingUnitAxis=lyts_FirstReportingUnitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ReportingUnitAxis=lyts_SecondReportingUnitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ReportingUnitAxis=lyts_ThirdReportingUnitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ReportingUnitAxis=lyts_FourthReportingUnitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=lyts_LightingSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: