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Summary Significant Accounting Policies - Nontrolling Interests (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Aug. 31, 2016	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	May 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2016	Aug. 31, 2015	Dec. 31, 2014
Noncontrolling Interests
Net loss attributable to SemiLEDs stockholders	$ (12,171)	$ (3,253)	$ (2,539)	$ (3,312)	$ (3,000)	$ (3,041)	$ (2,902)	$ (4,331)	$ (21,275)	$ (13,274)
Transfers to noncontrolling interests:
Change from net loss attributable to SemiLEDs stockholders and transfer to noncontrolling interests										(13,399)
Ning Xiang
Noncontrolling Interests
Ownership interest acquired (as a percent)											6.00%
Ownership interest (as a percent)	93.00%							87.00%	93.00%		93.00%
Transfers to noncontrolling interests:
Decrease in SemiLEDs additional paid in capital for purchase of common shares in Ning Xiang										$ (125)

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