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Net Income (Loss) Per Share of Common Stock (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 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
Basic:                      
Net income (loss) attributable to SemiLEDs stockholders $ (24,619) $ (10,003) $ (7,114) $ (7,721) $ (13,633) $ (5,123) $ (1,168) $ 3,820 $ (49,457) $ (16,104) $ 10,828
8% noncumulative dividends on convertible preferred stock                   (1,532) (5,634)
Undistributed earnings allocated to convertible preferred stockholders                   (1,538) (3,370)
Net income (loss) attributable to SemiLEDs common stockholders, basic                 (49,457) (19,174) 1,824
Diluted:                      
Net income (loss) attributable to SemiLEDs common stockholders, basic                 (49,457) (19,174) 1,824
Undistributed earnings re-allocated to common stock                     78
Net income (loss) attributable to SemiLEDs common stockholders, diluted                 $ (49,457) $ (19,174) $ 1,902
Basic:                      
Shares used in computing net income (loss) per share attributable to SemiLEDs common stockholders, basic                 27,414 21,887 7,090
Diluted:                      
Shares used in computing net income (loss) per share attributable to SemiLEDs common stockholders, basic                 27,414 21,887 7,090
Add: Weighted average effect of dilutive securities:                      
Stock options (in shares)                     633
Diluted (in shares)                 27,414 21,887 7,723
Net income (loss) per share attributable to SemiLEDs common stockholders:                      
Basic (in dollars per share)                 $ (1.80) $ (0.88) $ 0.26
Diluted (in dollars per share)                 $ (1.80) $ (0.88) $ 0.24
Noncumulative dividends on convertible preferred stock                      
Preferred stock, dividend rate (as a percent)                 8.00%    
Stock units and stock options to purchase common stock
                      
Securities excluded from computation of diluted net income (loss) per share of common stock                      
Anitdulitive securities (in shares)                 631 413  
Common stock subject to repurchase
                      
Securities excluded from computation of diluted net income (loss) per share of common stock                      
Anitdulitive securities (in shares)                 1 3  
Convertible preferred stock
                      
Securities excluded from computation of diluted net income (loss) per share of common stock                      
Anitdulitive securities (in shares)                     13,719