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Commitments and Contingencies - Product Warranty Accrual (Details) - USD ($) | Feb. 28, 2017 | Feb. 29, 2016 | Feb. 28, 2015 | Feb. 28, 2014
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Loss Contingencies [Line Items] |  |  |  |
Reserve for warranty | $ 2,098,000 | $ 2,915,000 | $ 2,287,000 | $ 1,338,000
Accrued warranty | 2,098,000 | $ 2,915,000 |  |
Energy [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Letters of credit outstanding | $ 23,100,000 |  |  |

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