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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