Date when an entity was incorporated

No definition available.

Name:	dei_EntityIncorporationDateOfIncorporation
Namespace Prefix:	dei_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	leds_BusinessOrganizationLineItems
Namespace Prefix:	leds_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of wholly owned subsidiaries of the entity as on balance sheet date.

+ References

No definition available.

+ Details

Name:	leds_NumberOfWhollyOwnedSubsidiaries
Namespace Prefix:	leds_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of common stock sold in outstanding shares.

+ References

No definition available.

+ Details

Name:	leds_PercentageOfCommonStockSoldInOutstandingShares
Namespace Prefix:	leds_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

+ References

No definition available.

+ Details

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

- Definition

Value of shares of other common stock instruments held by shareholders, such as exchangeable shares. May be all or portion of the number of common shares authorized.

+ References

No definition available.

+ Details

Name:	us-gaap_CommonStockOtherValueOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=leds_SemiLEDsOptoelectronicsCompanyLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=leds_TaiwanBandaotiZhaomingCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=leds_XianChangMaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Business (Details)		1 Months Ended	3 Months Ended
Business (Details)	Jan. 17, 2020	Jan. 31, 2020 USD ($)	Nov. 30, 2020 subsidiary	Nov. 17, 2019 USD ($)
Business
Date of entity incorporation			Jan. 04, 2005
Number of wholly owned subsidiaries \| subsidiary			2
Taiwan SemiLEDs \| Taiwan Bandaoti Zhaoming Co., Ltd.
Business
Ownership interest (as a percent)			97.00%
XianChang Ma
Business
Percentage of common stock sold in outstanding shares	4.00%
Total amount paid to the company		$ 140,000
Business acquisition , transaction costs				$ 40,000
Aggregate amount of stock				$ 100,000