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Summary of Significant Accounting Policies (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 28, 2014	Feb. 28, 2013
Noncontrolling Interests
Net loss attributable to SemiLEDs stockholders	$ (6,409)	$ (5,991)	$ (12,701)	$ (14,914)
Ning Xiang
Noncontrolling Interests
Net loss attributable to SemiLEDs stockholders	(6,409)		(12,701)
Transfers to noncontrolling interests:
Decrease in SemiLEDs additional paid in capital for purchase of common shares in Ning Xiang			(142)
Change from net loss attributable to SemiLEDs stockholders and transfer to noncontrolling interests	$ (6,409)		$ (12,843)

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