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Investments in Unconsolidated Entities (Details) (USD $)
 3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Aug. 31, 2012
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Aug. 31, 2012
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Aug. 31, 2011
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Dec. 31, 2009
China SemiLEDs
Aug. 31, 2012
China SemiLEDs
Aug. 31, 2011
China SemiLEDs
Aug. 31, 2012
China SemiLEDs
Subsequent event
Aug. 31, 2012
Other equity method investees
Aug. 31, 2011
Other equity method investees
Apr. 30, 2011
SILQ (Malaysia) Sdn. Bhd. ("SILQ")
Sep. 30, 2009
SILQ (Malaysia) Sdn. Bhd. ("SILQ")
Aug. 31, 2012
SILQ (Malaysia) Sdn. Bhd. ("SILQ")
Aug. 31, 2011
SILQ (Malaysia) Sdn. Bhd. ("SILQ")
Aug. 31, 2012
SS Optoelectronics Co., Ltd. ("SS Optoelectronics")
Aug. 31, 2011
SS Optoelectronics Co., Ltd. ("SS Optoelectronics")
Investments in unconsolidated entities                              
Percentage ownership         49.00% 49.00%           50.00% 50.00% 49.00% 49.00%
Equity method investments           $ 13,434,000           $ 525,000 $ 833,000 $ 248,000 $ 253,000
Cost method investments 1,048,000 1,048,000 1,059,000                        
Total investments in unconsolidated entities 1,821,000 1,821,000 15,579,000                        
Payment for investments       14,700,000           662,000 570,000        
Excess of share of net assets over the carrying value of investment       7,300,000 4,600,000 7,100,000                  
Weighted average useful life of tangible assets used in operations         11 years                    
Increase in investments of equity method investee         668,000 278,000                  
Decrease in net loss from investments of equity method investee         668,000 278,000                  
Impairment charge on long lived assets 7,500,000 7,507,000         18,200,000                
Summary Balance Sheet Information                              
Current assets 26,180,000 26,180,000 26,195,000   24,769,000 24,236,000   1,411,000 1,959,000            
Noncurrent assets 43,141,000 43,141,000 64,158,000   42,633,000 63,620,000   508,000 538,000            
Current liabilities 19,885,000 19,885,000 14,159,000   19,580,000 13,874,000   305,000 285,000            
Noncurrent liabilities 38,485,000 38,485,000 32,139,000   38,485,000 32,139,000                  
Shareholders' equity 10,951,000 10,951,000 44,055,000   9,337,000 41,843,000   1,614,000 2,212,000            
Summary Statement of Operations Information                              
Revenues, net   1,440,000 568,000   837,000 355,000   603,000 213,000            
Gross loss   (10,169,000) (3,306,000)   (10,155,000) (3,267,000)   (14,000) (39,000)            
Loss from operations   (34,741,000) (8,187,000)   (34,269,000) (7,432,000)   (472,000) (755,000)            
Net loss   $ (32,909,000) $ (7,157,000)   $ (32,513,000) $ (6,388,000)   $ (396,000) $ (769,000)            
Cost Method Investments                              
Number of unaffiliated companies in which investments are held in non-marketable common stock 3 3 3