Suncore Joint Venture	3 Months Ended
Suncore Joint Venture	Dec. 31, 2011
Suncore Joint Venture [Abstract]
Suncore Joint Venture [Text Block]	Suncore Joint Venture On July 30, 2010, we entered into a joint venture agreement with San'an Optoelectronics Co., Ltd., or San'an, for the purpose of engaging in the development, manufacturing, and distribution of CPV receivers, modules, and systems for terrestrial solar power applications under a technology license from us. The joint venture, Suncore Photovoltaic Technology Co., Ltd., or Suncore, is a limited liability company under the laws of the People's Republic of China. Initially, the total registered capital of Suncore was $30 million, of which San'an contributed $18 million in cash and EMCORE contributed $12 million in cash. During the three months ended December 31, 2011, Suncore increased their registered capital by recording a deemed capital distribution of $37.0 million which was distributed and reinvested in proportion to each entity's registered capital. San'an was allocated 60% of the deemed capital distribution, or $22.2 million, and EMCORE was allocated 40%, or $14.8 million. During this same period, Suncore also recorded a cash dividend of approximately $4.1 million in proportion to each entity's registered capital of which San'an received $2.5 million and EMCORE received $1.6 million. EMCORE incurred a 10% foreign income tax of approximately $1.6 million associated with these capital distributions which is disclosed under the caption foreign income tax expense on capital distributions on our statement of operations. EMCORE's cash dividend was equal to the foreign income tax expense incurred on these capital distributions. In August 2011, we signed a solar rooftop CPV development agreement with our Suncore joint venture pursuant to which we will collaborate on the development and application of the current 500X and next-generation 1000X rooftop CPV systems. In summary, Suncore agreed to purchase joint ownership rights to rooftop CPV intellectual property and reimburse us 50% of all research and development costs incurred related to rooftop CPV solutions in exchange for joint ownership rights to the newly developed intellectual property. In addition, Suncore agreed to pay us a development fee of 20% on research and development costs billed to Suncore with a maximum development fee payout of approximately $0.2 million. During the three months ended December 31, 2011, we billed Suncore approximately $0.3 million for research and developments costs and recognized $0.1 million in development fees. Pursuant to the joint venture agreement, San'an and EMCORE share the profits, losses, and risks of Suncore in proportion to and, in the event of losses, to the extent of their respective contributions to the registered capital of Suncore. We continue to hold a 40% registered ownership in Suncore and EMCORE's proportionate share of Suncore's loss for the three months ended December 31, 2011 totaled $1.0 million. We recorded the Suncore cash dividend of $1.6 million as a reduction in our investment in Suncore. As of December 31, 2011, our net investment in Suncore totaled $0.2 million.

The entire disclosure for equity investment, or group of investments, for which combined disclosure is appropriate, including: (a) the name of each investee and percentage of ownership of common stock, (b) accounting policies for investments in common stock, (c) difference between the amount at which the investment is carried and the amount of underlying equity in net assets and the accounting treatment of the difference, (d) the total fair value of each identified investment for which a market value is available, (e) summarized information as to assets, liabilities, and results of operations of the investees (for investments in unconsolidated subsidiaries, common stock of joint ventures, or other investments using the equity method), and (f) material effects of possible conversions, exercises, or contingent issuances of the investee. Other disclosures include (a) the names of any investee in which the investor owns 20 percent or more of the voting stock and investment is not accounted for using the equity method, and the reasons why not, and (b) the names of any investee in which the investor owns less than 20 percent of the voting stock and the investment is accounted for using the equity method, and the reasons why it is.

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