Summary of Significant Accounting Policies - Noncontrolling Interests (Details) $ in Thousands, $ in Millions			21 Months Ended
	Sep. 01, 2018 USD ($) shares	Sep. 01, 2018 TWD ($) shares	Sep. 30, 2020 shares	Feb. 28, 2022 shares	Aug. 31, 2021 shares	Aug. 31, 2018 shares
Minority Interest [Line Items]
Common stock, shares issued				4,514,000	4,460,000
Taiwan Bandaoti Zhaoming Co., Ltd.
Minority Interest [Line Items]
Noncontrolling interest (as percentage)	3.31%	3.31%		3.05%		0.00%
Taiwan Bandaoti Zhaoming Co., Ltd.
Minority Interest [Line Items]
Common stock issued during period, shares	414,000	414,000
Common stock, shares issued	12,501,715	12,501,715				12,087,715
Common stock issued during period, value	$ 176	$ 5.4
Taiwan SemiLEDs | Taiwan Bandaoti Zhaoming Co., Ltd.
Minority Interest [Line Items]
Common shares purchased form non-controlling interests			33,000