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Acquisitions (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	0 Months Ended	12 Months Ended		0 Months Ended	12 Months Ended
	Apr. 02, 2010 SBDI	Aug. 31, 2010 SBDI	Apr. 01, 2010 SBDI	Aug. 03, 2011 Ning Xiang	Aug. 31, 2011 Ning Xiang	Aug. 31, 2010 Ning Xiang	Aug. 03, 2011 Ning Xiang Customer relationships	Aug. 03, 2011 Ning Xiang Patents
Acquisitions
Ownership interest acquired (as a percent)			100.00%	51.00%
Total cash consideration			$ 933	$ 3,500
Acquisition related costs	15			53
Gain on acquisition	349
Revenues recognized since acquisition date		92			426
Net loss since acquisition date		282			47
Unaudited pro forma results
Revenues, net (unaudited)		35,981			36,855	38,105
Net income (loss) (unaudited)		10,226			(16,702)	11,058
Net income (loss) per share attributable to SemiLEDs common stockholders, basic (unaudited) (in dollars per share)		$ 0.28			$ (0.90)	$ 0.27
Net income (loss) per share attributable to SemiLEDs common stockholders, diluted (unaudited) (in dollars per share)		$ 0.28			$ (0.90)	$ 0.26
Fair value of the noncontrolling interests in Ning Xiang at the acquisition date
Current assets				3,661
Plant and equipment				166
Other assets				11
Purchased intangible assets							1,379	24
Current liabilities				(1,257)
Total identifiable net assets acquired				3,984
Noncontrolling interests in Ning Xiang				(1,607)
Goodwill				1,106
Total cash purchase price				$ 3,483

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