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Share-Based Compensation Plans - Unrecognized share based compensation expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Feb. 28, 2018 | Feb. 28, 2017 | Feb. 29, 2016
UNRECOGNIZED SHARE-BASED COMPENSATION EXPENSE |  |  |
Grants (in shares) | 0 |  |
Stock Option Officers Employees and Consultants |  |  |
UNRECOGNIZED SHARE-BASED COMPENSATION EXPENSE |  |  |
Unrecognized Compensation Expense | $ 1,384 |  |
Weighted Average Period of Recognition | 16 months 27 days |  |
Grants (in shares) |  | 2,000 | 186,000
Restricted Stock Units and Performance Stock Units |  |  |
UNRECOGNIZED SHARE-BASED COMPENSATION EXPENSE |  |  |
Unrecognized Compensation Expense | $ 12,220 |  |
Weighted Average Period of Recognition | 23 months 24 days |  |

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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- References No definition available. + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Details
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- Details
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