Document and Entity Information - shares	9 Months Ended
	May 31, 2022	Jul. 05, 2022
Cover [Abstract]
Entity Registrant Name	SemiLEDs Corp
Entity Central Index Key	0001333822
Trading Symbol	LEDS
Document Type	10-Q
Document Period End Date	May 31, 2022
Amendment Flag	false
Current Fiscal Year End Date	--08-31
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		4,530,154
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
Entity Current Reporting Status	Yes
Entity Address, Address Line One	3F, No. 11 Ke Jung Rd
Entity Address, Address Line Two	Chu-Nan Site
Entity Address, City or Town	Miao-Li County
Entity Address, Address Line Three	Hsinchu Science Park, Chu-Nan 350
Entity Address, Country	TW
Entity Address, Postal Zip Code	350
City Area Code	+886
Local Phone Number	37-586788
Title of 12(b) Security	Common Stock, par value $0.0000056
Security Exchange Name	NASDAQ
Entity Incorporation, State or Country Code	DE
Entity File Number	001-34992
Entity Tax Identification Number	20-2735523
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes