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Summary of Significant Accounting Policies (Details 5) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Aug. 31, 2012
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Aug. 03, 2011
Ning Xiang
Acquisitions          
Ownership interest acquired (as a percent)         51.00%
Goodwill         $ 1,106
Impairment of Long-Lived Assets          
Impairment of long-lived assets 7,500 7,507      
Advertising Costs          
Advertising costs incurred   290 104 32  
Revenues Recognition          
Minimum warranty period   6 months      
Maximum warranty period   1 year      
Accounts Receivable          
Charges to bad debt expense   $ 1,405 $ 1,196 $ 100  
Net Income (Loss) Per Share of SemiLEDs Common Stock          
Preferred stock, dividend rate (as a percent)   8.00%