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Business Segments - Schedule of Revenues by Major Customers (Detail) (Sales) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Beijing JINGCHENG New Energy Co., Ltd. |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Revenue percentage | 28.00% | 26.00% | 31.00% | 22.00%
INOX Wind Limited |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Revenue percentage | 27.00% | 19.00% | 21.00% | 17.00%
Karara Mining Ltd. |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Revenue percentage |  |  |  | 13.00%
Maximum | Karara Mining Ltd. |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Revenue percentage | 10.00% | 10.00% | 10.00% |

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