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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% |  |  |

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