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Minority Investments	12 Months Ended
Minority Investments	Mar. 31, 2016
Equity Method Investments And Joint Ventures [Abstract]
Minority Investments	15. Minority Investments Investment in Tres Amigas LLC The Company made an investment in Tres Amigas, focused on providing the first common interconnection of America’s three power grids to help the country achieve its renewable energy goals and facilitate the smooth, reliable and efficient transfer of green power from region to region. The Company’s original investment in Tres Amigas was $5.4 million. During the three months ended June 30, 2015, the Company determined that as a result of delays in Tres Amigas securing financing for the project, as well as the Company’s expectation that its investment would not be recoverable based on recent adverse market indicators for potential sales of the Company’s share of the investment, that its investment in Tres Amigas required further analysis for other-than-temporary impairment. The Company recorded an impairment charge of $0.7 million to fully impair this investment in the fiscal year ended March 31, 2016. On March 11, 2016, the Company sold 100% of its minority share investment in Tres Amigas to an investor for $0.6 million. The Company received $0.3 million according to the terms of the purchase agreement upon closing, which was recorded as a gain during the three months ended March 31, 2016. The final $0.3 million is to be paid when Tres Amigas achieves the earlier of certain agreed-upon financing conditions which is expected to occur during the first half of fiscal 2016. Investment in Blade Dynamics Ltd. The Company acquired (through its Austrian subsidiary), a minority ownership position in Blade Dynamics, a designer and manufacturer of advanced wind turbine blades based on proprietary materials and structural technologies. The Company’s original investment was for $8.0 million in cash. During the year ended March 31, 2015, the Company determined that its investment was no longer recoverable and therefore recorded an impairment charge of $3.5 million. On October 6, 2015, 100% of the outstanding common stock of Blade Dynamics was acquired by a subsidiary of General Electric Company. After deducting transaction expenses, AMSC received net proceeds of $2.8 million from the sale, which was recorded as a gain during the fiscal year ended March 31, 2016. Additionally, under the terms of the purchase agreement, AMSC may be entitled to receive up to an additional $1.2 million in proceeds upon the successful achievement of certain milestones by Blade Dynamics over the next three years.