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Investments in Unconsolidated Entities (Details) (USD $)	3 Months Ended				1 Months Ended	3 Months Ended		1 Months Ended
	Nov. 30, 2012	Aug. 31, 2012	Nov. 30, 2012 SILQ (Malaysia) Sdn. Bhd. ("SILQ")	Aug. 31, 2012 SILQ (Malaysia) Sdn. Bhd. ("SILQ")	Dec. 31, 2009 China SemiLEDs	Nov. 30, 2012 China SemiLEDs	Aug. 31, 2012 China SemiLEDs	Sep. 30, 2012 SS Optoelectronics Co., Ltd. ("SS Optoelectronics")	Aug. 31, 2012 SS Optoelectronics Co., Ltd. ("SS Optoelectronics")
Investments in unconsolidated entities
Percentage ownership			50.00%	50.00%	49.00%	49.00%	49.00%		49.00%
Equity method investments			$ 478,000	$ 525,000					$ 248,000
Cost method investments	3,957,000	1,048,000
Total investments in unconsolidated entities	4,435,000	1,821,000
Payment for investments					14,700,000
Excess of share of net assets over the carrying value of investment					7,300,000		4,600,000
Weighted average useful life of tangible assets used in operations						11 years
Return of investment after dissolved joint venture agreement	$ 250,000							$ 250,000

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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