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Summary Significant Accounting Policies - Nontrolling Interests (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 31, 2016 | May 31, 2016 | Feb. 29, 2016 | Nov. 30, 2015 | Aug. 31, 2015 | May 31, 2015 | Feb. 28, 2015 | Nov. 30, 2014 | Aug. 31, 2016 | Aug. 31, 2015 | Dec. 31, 2014
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to SemiLEDs stockholders | $ (12,171) | $ (3,253) | $ (2,539) | $ (3,312) | $ (3,000) | $ (3,041) | $ (2,902) | $ (4,331) | $ (21,275) | $ (13,274) |
Transfers to noncontrolling interests: |  |  |  |  |  |  |  |  |  |  |
Change from net loss attributable to SemiLEDs stockholders and transfer to noncontrolling interests |  |  |  |  |  |  |  |  |  | (13,399) |
Ning Xiang |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired (as a percent) |  |  |  |  |  |  |  |  |  |  | 6.00%
Ownership interest (as a percent) | 93.00% |  |  |  |  |  |  | 87.00% | 93.00% |  | 93.00%
Transfers to noncontrolling interests: |  |  |  |  |  |  |  |  |  |  |
Decrease in SemiLEDs additional paid in capital for purchase of common shares in Ning Xiang |  |  |  |  |  |  |  |  |  | $ (125) |

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