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Related-party Transactions (Details)
 3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Aug. 31, 2012
USD ($)
Aug. 31, 2011
USD ($)
Aug. 31, 2012
USD ($)
Aug. 31, 2011
USD ($)
Jul. 31, 2012
China SemiLEDs
USD ($)
Jul. 31, 2012
China SemiLEDs
CNY
Sep. 30, 2011
China SemiLEDs
USD ($)
Aug. 31, 2012
China SemiLEDs
USD ($)
Aug. 31, 2011
China SemiLEDs
USD ($)
Related-Party Transactions                  
Sales of goods               $ 148,000 $ 611,000
Rendering of services               260,000 308,000
Gain on disposal of patents     51,000 17,000       51,000 17,000
Consideration received from sale of equipment             244,000    
Aggregate principal amount         200,000 1,400,000      
Term of each borrowing         3 months 3 months      
Variable rate basis         three-month lending rate published by the People's Bank of China three-month lending rate published by the People's Bank of China      
Multiplier applied to the variable rate basis         1.1 1.1      
Charge to bad debt expense 1,400,000 1,100,000           1,405,000  
Amount due from related party recorded as accounts receivable 157,000 825,000 157,000 825,000       118,000 780,000
Amounts due to related party recorded in other current liabilities               $ 65,000 $ 5,000