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Investments in Unconsolidated Entities (Details) (USD $) | 3 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended |  |  |  |
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Aug. 31, 2012 item | Aug. 31, 2012 item | Aug. 31, 2011 item | Dec. 31, 2009 China SemiLEDs | Aug. 31, 2012 China SemiLEDs | Aug. 31, 2011 China SemiLEDs | Aug. 31, 2012 China SemiLEDs Subsequent event | Aug. 31, 2012 Other equity method investees | Aug. 31, 2011 Other equity method investees | Apr. 30, 2011 SILQ (Malaysia) Sdn. Bhd. ("SILQ") | Sep. 30, 2009 SILQ (Malaysia) Sdn. Bhd. ("SILQ") | Aug. 31, 2012 SILQ (Malaysia) Sdn. Bhd. ("SILQ") | Aug. 31, 2011 SILQ (Malaysia) Sdn. Bhd. ("SILQ") | Aug. 31, 2012 SS Optoelectronics Co., Ltd. ("SS Optoelectronics") | Aug. 31, 2011 SS Optoelectronics Co., Ltd. ("SS Optoelectronics")
Investments in unconsolidated entities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage ownership |  |  |  |  | 49.00% | 49.00% |  |  |  |  |  | 50.00% | 50.00% | 49.00% | 49.00%
Equity method investments |  |  |  |  |  | $ 13,434,000 |  |  |  |  |  | $ 525,000 | $ 833,000 | $ 248,000 | $ 253,000
Cost method investments | 1,048,000 | 1,048,000 | 1,059,000 |  |  |  |  |  |  |  |  |  |  |  |
Total investments in unconsolidated entities | 1,821,000 | 1,821,000 | 15,579,000 |  |  |  |  |  |  |  |  |  |  |  |
Payment for investments |  |  |  | 14,700,000 |  |  |  |  |  | 662,000 | 570,000 |  |  |  |
Excess of share of net assets over the carrying value of investment |  |  |  | 7,300,000 | 4,600,000 | 7,100,000 |  |  |  |  |  |  |  |  |
Weighted average useful life of tangible assets used in operations |  |  |  |  | 11 years |  |  |  |  |  |  |  |  |  |
Increase in investments of equity method investee |  |  |  |  | 668,000 | 278,000 |  |  |  |  |  |  |  |  |
Decrease in net loss from investments of equity method investee |  |  |  |  | 668,000 | 278,000 |  |  |  |  |  |  |  |  |
Impairment charge on long lived assets | 7,500,000 | 7,507,000 |  |  |  |  | 18,200,000 |  |  |  |  |  |  |  |
Summary Balance Sheet Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets | 26,180,000 | 26,180,000 | 26,195,000 |  | 24,769,000 | 24,236,000 |  | 1,411,000 | 1,959,000 |  |  |  |  |  |
Noncurrent assets | 43,141,000 | 43,141,000 | 64,158,000 |  | 42,633,000 | 63,620,000 |  | 508,000 | 538,000 |  |  |  |  |  |
Current liabilities | 19,885,000 | 19,885,000 | 14,159,000 |  | 19,580,000 | 13,874,000 |  | 305,000 | 285,000 |  |  |  |  |  |
Noncurrent liabilities | 38,485,000 | 38,485,000 | 32,139,000 |  | 38,485,000 | 32,139,000 |  |  |  |  |  |  |  |  |
Shareholders' equity | 10,951,000 | 10,951,000 | 44,055,000 |  | 9,337,000 | 41,843,000 |  | 1,614,000 | 2,212,000 |  |  |  |  |  |
Summary Statement of Operations Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues, net |  | 1,440,000 | 568,000 |  | 837,000 | 355,000 |  | 603,000 | 213,000 |  |  |  |  |  |
Gross loss |  | (10,169,000) | (3,306,000) |  | (10,155,000) | (3,267,000) |  | (14,000) | (39,000) |  |  |  |  |  |
Loss from operations |  | (34,741,000) | (8,187,000) |  | (34,269,000) | (7,432,000) |  | (472,000) | (755,000) |  |  |  |  |  |
Net loss |  | $ (32,909,000) | $ (7,157,000) |  | $ (32,513,000) | $ (6,388,000) |  | $ (396,000) | $ (769,000) |  |  |  |  |  |
Cost Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of unaffiliated companies in which investments are held in non-marketable common stock | 3 | 3 | 3 |  |  |  |  |  |  |  |  |  |  |  |

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