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Quarterly Results of Operations (Unaudited) (Details) (USD $)
 3 Months Ended 12 Months Ended
Aug. 31, 2012
May 31, 2012
Feb. 29, 2012
Nov. 30, 2011
Aug. 31, 2011
May 31, 2011
Feb. 28, 2011
Nov. 30, 2010
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Quarterly Results of Operations (Unaudited)                      
Revenues, net $ 5,469,000 $ 9,178,000 $ 7,905,000 $ 6,747,000 $ 5,329,000 $ 5,600,000 $ 9,957,000 $ 13,016,000 $ 29,299,000 $ 33,902,000 $ 35,763,000
Cost of revenues 8,473,000 10,232,000 8,627,000 7,569,000 10,306,000 5,124,000 7,628,000 6,376,000 34,901,000 29,434,000 19,640,000
Gross profit (loss) (3,004,000) (1,054,000) (722,000) (822,000) (4,977,000) 476,000 2,329,000 6,640,000 (5,602,000) 4,468,000 16,123,000
Operating expenses 13,160,000 6,928,000 5,068,000 5,594,000 7,158,000 4,370,000 2,936,000 1,734,000 30,750,000 16,198,000 4,954,000
Income (loss) from operations (16,164,000) (7,982,000) (5,790,000) (6,416,000) (12,135,000) (3,894,000) (607,000) 4,906,000 (36,352,000) (11,730,000) 11,169,000
Equity in losses from unconsolidated entities, net (8,744,000) (2,173,000) (1,176,000) (1,526,000) (1,124,000) (1,105,000) (675,000) (222,000) (13,619,000) (3,126,000) (313,000)
Income tax expense (benefit)         678,000 (10,000) (219,000) 276,000   725,000 267,000
Net income (loss) attributable to SemiLEDs stockholders (24,619,000) (10,003,000) (7,114,000) (7,721,000) (13,633,000) (5,123,000) (1,168,000) 3,820,000 (49,457,000) (16,104,000) 10,828,000
Net income (loss) per share attributable to SemiLEDs common stockholders:                      
Net income (loss) per share attributable to SemiLEDs common stockholders, basic and diluted $ (0.90) $ (0.36) $ (0.26) $ (0.28) $ (0.50) $ (0.19) $ (0.05) $ 0.11 $ (1.80) $ (0.88)  
Excess capacity charge as a result of a decrease in customer demand 2,000,000 1,600,000                  
Inventory write-down 800,000 700,000     4,300,000       3,148,000 5,793,000 40,000
Potential litigation settlement associated with the Cree litigation   1,500,000             1,500,000    
Impairment of long-lived assets 7,500,000               7,507,000    
Quarterly Results of Operations                      
Net loss reported by China SemiLEDs (8,744,000) (2,173,000) (1,176,000) (1,526,000) (1,124,000) (1,105,000) (675,000) (222,000) (13,619,000) (3,126,000) (313,000)
Increase in bad debt expense 1,400,000       1,100,000            
Increase in valuation allowance on net deferred tax assets         600,000       0 584,000 (1,163,000)
China SemiLEDs
                      
Quarterly Results of Operations (Unaudited)                      
Equity in losses from unconsolidated entities, net 8,700,000 2,100,000                  
Quarterly Results of Operations                      
Net loss reported by China SemiLEDs 8,700,000 2,100,000                  
Increase in bad debt expense                 $ 1,405,000